W DOC AIRBUS | AMM A320F

Installation of the Heat Exchanger Unit (into the Aircraft)

TASK 21-52-24-400-001-A
Installation of the Heat Exchanger Unit (into the Aircraft)

WARNING: MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE. HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
WARNING: BE CAREFUL WHEN YOU REMOVE OR INSTALL THIS EQUIPMENT. THIS EQUIPMENT IS HEAVY (MORE THAN 12 KG (26.5 lb)) AND CAN CAUSE INJURY AND/OR DAMAGE.
NOTE: The procedure is the same for heat-exchanger units 10HM4 and 11HM4.
ZONE: 190
FIN: 10HM4
FIN: 11HM4
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
WARNING NOTICE(S)
No specific
Torque wrench: range to between 0.12 and 0.10 m.daN (10.62 and 8.85 lbf.in ) T
No specific
Torque wrench: range to between 0.40 and 0.33 m.daN (35.40 and 29.20 lbf.in ) T
No specific
Torque wrench: range to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T
No specific
Torque wrench: range to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in ) T
No specific
Torque wrench: range to between 0.85 and 0.8 m.daN (75.22 and 70.80 lbf.in ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.03FAB1)
Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.08ABC1)
Aqueous Cleaner-Aircraft Exterior Pressure Spraying -
(Material No.14SBA1)
Textile-Lint free Cotton -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
190
BELLY FAIR, AIR CONDITIONING & HYD COMPT
FOR [10HM4] (HEAT EXCHANGER UNIT)
191KB
FOR [11HM4] (HEAT EXCHANGER UNIT)
192KB
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
89
SEAL
AIPC 21-52-03-11-075
84
SEAL 64 INSTL
AIPC 21-52-03-11-420
47
SEAL
AIPC 21-52-03-14-015
43
SEAL
AIPC 21-52-03-14-016
189
SEAL
AIPC 21-52-03-17-045
184
SEAL
AIPC 21-52-03-17-340
147
SEALS
AIPC 21-52-03-20-015
143
SEAL
AIPC 21-52-03-20-016
77
SEAL
AIPC 21-52-41-28-050
74
NUT
AIPC 21-52-41-28-060
73
WASHER
AIPC 21-52-41-28-070
74
NUT
AIPC 21-52-41-29-090
73
WASHER
AIPC 21-52-41-29-100
87
SEAL
AIPC 21-52-41-29-130
71
SEAL
AIPC 21-52-41-29-200
84
SEAL
AIPC 21-52-83-03-320
89
SEAL
AIPC 21-52-83-03-350
184
SEAL
AIPC 21-52-83-10-270
189
SEAL
AIPC 21-52-83-10-300
143
SEAL
AIPC 21-52-83-14-100
147
SEAL
AIPC 21-52-83-14-110
231
SEAL
AIPC 21-58-03-01-450
228
GASKET
AIPC 21-58-03-01-580
228
GASKET
AIPC 21-58-83-01-590
231
SEAL
AIPC 21-58-83-01-660
 E. Referenced Information
REFERENCE
DESIGNATION
TASK 12-33-21-618-001-A-01
Pre-conditioning through the HP Ground Connection
TASK 12-33-21-618-001-A-02
Pre-conditioning with the APU
TASK 20-26-00-910-002-A
Installation of Expansion Joints
TASK 20-28-00-912-802-A
Electrical Bonding - General Maintenance Procedure
TASK 20-28-00-912-803-A
Bonding Surface Preparation
TASK 21-52-22-000-001-A
Removal of the Fan Plenum Chamber
TASK 21-52-22-400-001-A
Installation of the Fan Plenum Chamber
TASK 21-52-23-000-001-A
Removal of the Pipe Assembly between the Main Heat Exchanger and the Air Cycle Machine
TASK 21-52-23-400-001-A
Installation of the Pipe Assembly between the Main Heat Exchanger and the Air Cycle Machine
TASK 21-58-00-710-002-A
Operational Test of the Conditioned Service Air System with Bleed Air
TASK 21-61-52-000-003-A
Removal of the Ram-Air Outlet
TASK 21-61-52-400-003-A
Installation of the Ram-Air Outlet
TASK 21-63-00-710-004-A
Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU
TASK 24-41-00-861-002-A
Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01
Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02
Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A
De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01
De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02
De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 53-35-13-000-002-A
Removal of the Quick-Release Access Panels from the Belly Fairing Structure
TASK 53-35-13-400-002-A
Installation of the Quick-Release Access Panels on the Belly Fairing Structure
F Attachment Components - Heat Exchanger Unit
F Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
F Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
F Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
F Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
F Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 21-52-24-860-051-A
A. Aircraft Maintenance Configuration
   (1) Make sure that the aircraft electrical circuits are energized
(Ref. AMM TASK 24-41-00-861-002).
   (2) Make sure that these access panels are removed from the belly fairing structure (Ref. AMM TASK 53-35-13-000-002):
     (a) FOR [10HM4] (HEAT EXCHANGER UNIT)
     (b) FOR [11HM4] (HEAT EXCHANGER UNIT)
   (3) In the cockpit, on the overhead panel, on the AIR COND section of panel 30VU, make sure that:
     (a) The APU BLEED pushbutton switch is released (the ON legend is off).
     (b) The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are released (the OFF legends are on).
     (c) The WARNING NOTICE(S) is in position to tell persons not to operate these pushbutton switches.
   (4) On the HP ground connector, make sure that the WARNING NOTICE(S) is in position to tell persons not to supply the ground air.
   (5) Make sure that the pipe assembly is removed (Ref. AMM TASK 21-52-23-000-001).
   (6) Make sure that the ram-air outlet is removed (Ref. AMM TASK 21-61-52-000-003).
Subtask 21-52-24-865-051-A
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
FOR FIN: 10HM4 (HEAT EXCHANGER UNIT)
49VUAIR COND/TEMP CTL/SYS 1 CHAN B/28VDC52HHD08
** ON A/C NOT FOR ALL
121VUIGGS/CTRL7YAN28
** ON A/C NOT FOR ALL
121VUIGGS/CTRL7YAP28
** ON A/C NOT FOR ALL
122VUAIR COND/PACK TEMP/CTL SYS1/1/115VAC1HHX22
122VUAIR COND/PACK TEMP/CTL SYS1/1/28VDC3HHX21
122VUAIR COND/PACK TEMP CTL SYS2/1/28VDC4HHY19
122VUAIR COND/PACK TEMP CTL SYS2/1/115VAC2HHY18
** ON A/C NOT FOR ALL
122VUAIR COND/TEMP CTL SYS 1/CHAN A/115VAC49HHX22
122VUAIR COND/TEMP CTL SYS 1/CHAN A/28VDC51HHX21
122VUAIR COND/TEMP CTL SYS 1/CHAN B/115VAC50HHY18
** ON A/C NOT FOR ALL
122VUCSAS / CTRL1HWU17
** ON A/C NOT FOR ALL
FOR FIN: 11HM4 (HEAT EXCHANGER UNIT)
122VUAIR COND/PACK TEMP/CTL SYS1/2/115VAC21HHW22
122VUAIR COND/PACK TEMP/CTL SYS1/2/28VDC23HHW21
122VUAIR COND/PACK TEMP CTL SYS2/2/28VDC24HHY21
122VUAIR COND/PACK TEMP CTL SYS2/2/115VAC22HHY20
** ON A/C NOT FOR ALL
122VUAIR COND/TEMP CTL SYS 2/CHAN A/115VAC53HHW22
122VUAIR COND/TEMP CTL SYS 2/CHAN A/28VDC55HHW21
122VUAIR COND/TEMP CTL SYS 2/CHAN B/28VDC56HHY21
122VUAIR COND/TEMP CTL SYS 2/CHAN B/115VAC54HHY20
4. Procedure
Subtask 21-52-24-420-054-A
A. Installation of the Attachment Components
F Attachment Components - Heat Exchanger Unit
   (1) Put the support rods (80), (82) and (83) in their correct installation positions in the brackets (1).
   (2) Install the bushings (58), (if installed, washers (57)), bolts (56), washers (55) and nuts (54).
Subtask 21-52-24-560-051-E ** ON A/C NOT FOR ALL
B. Preparation of the Replacement Component
F Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
F Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
F Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
F Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
   (1) Replace the air-conditioning pack identification-plate/air-conditioning pack amendment-plate:
     (a) If the air-conditioning pack identification-plate/air-conditioning pack amendment-plate is removed:
       1 Put the air-conditioning pack identification-plate/air-conditioning pack amendment-plate (53) in position on the replacement heat exchanger unit (7).
       2 Install the screws (52).
NOTE: The air-conditioning pack identification-plate/air-conditioning pack amendment-plate contains the serial number and the part number for the air conditioning pack.
       3 Tighten the screws (52).
     (b) If the air-conditioning pack identification-plate and the air-conditioning pack amendment-plate are removed:
       1 Put the pack identification-plate (51) and the pack amendment-plate (53) in position on the replacement heat exchanger unit (7).
       2 Install the screws (52).
NOTE: The air-conditioning pack identification-plate and the air-conditioning pack amendment-plate contain the serial number and the part number for the air conditioning pack.
       3 Tighten the screws (52).
   (2) Clean the duct and the sleeve sealing surfaces as follows:
     (a) Remove the blanking caps from the applicable ducts and flanges.
     (b) Remove all the particles from the sealing surfaces with Textile-Lint free Cotton - (Material No.14SBA1) and Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) .
     (c) Dry the sealing surfaces fully.
   (3) Examine the duct and sleeve sealing surfaces as follows:
     (a) Make sure that there are no distortion, scratches and blemishes on the seal mating surfaces of the items that follow:
  • The duct (15)
  • The flanges (4), (10), (17), (70) and (76)
  • The pipe assembly (91)
  • All the other related seal mating surfaces.
     (b) Make sure that the seal location grooves in the sleeves (3), (16), (72), (78), (79) and (88) are not damaged or twisted.
   (4) Install the seals (Ref. AMM TASK 20-26-00-910-002):
     (a) Carefully put the new seals in the sleeves as follows:
       1 The new AIPC 21-52-41-29-130 SEAL (87) in the sleeve (88).
       2 The new AIPC 21-52-41-29-200 SEAL (71) in the sleeve (72).
       3 The new AIPC 21-52-41-28-050 SEAL (77) in the sleeves (78) and (79).
       4 For the left heat-exchanger unit:
       5 For the right heat-exchanger unit:
   (5) Install the ducts, the pipe assemblies and the sleeves:
     (a) During installation, turn the ducts, the sleeves and the pipe assemblies to prevent damage to the seals in the sleeves.
   (6) Put the sleeve (3) in position on the heat exchanger unit (7), and move it on the heat exchanger unit as far as it goes.
   (7) Put the sleeve (88) in position on the flange (4), and move it on the flange as far as it goes:
     (a) Put the duct (15) in position in the sleeve (16).
   (8) Put the sleeve (16) in position on the heat exchanger unit (7) and move it on the heat exchanger unit as far as it goes:
     (a) Put the sleeve (72) in position on the flange (70) and move it on the flange as far as it goes.
     (b) Put the sleeve (78) in position on the flange (76).
     (c) Install the clamp (97) on the pipe assembly (91).
     (d) Turn the screw of the clamp (97) to touch, then torque it to one more full turn.
     (e) Put the pipe assembly (91) in position in the sleeve (78).
     (f) Apply a small quantity of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the mating surfaces of the retaining cables (92).
     (g) Hold the hexagonal part of the retaining cables (92).
     (h) Connect the retaining cables (92) in line with the holes in the flange (76):
       1 Install the new AIPC 21-52-41-28-070 WASHER (73) and the new AIPC 21-52-41-28-060 NUT (74).
NOTE: The retaining cables (92) will twist, if you do not hold the hexagonal part of the retaining cables (92).
     (i) Hold the hexagonal part of the retaining cables (92).
     (j) TORQUE the nuts (74) to between 0.85 and 0.8 m.daN (75.22 and 70.80 lbf.in ) T.
NOTE: The retaining cables (92) will twist, if you do not hold the hexagonal part of the retaining cables (92).
NOTE: This will give a safe and flexible connection.
     (k) Put the sleeve (79) in position on the pipe assembly (91), and move it on the pipe assembly as far as possible.
Subtask 21-52-24-560-051-F ** ON A/C NOT FOR ALL
B. Preparation of the Replacement Component
F Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
   (1) Replace the air-conditioning pack identification-plate/air-conditioning pack amendment-plate (53) as follows:
     (a) If the air-conditioning pack identification-plate/air-conditioning pack amendment-plate (53) is removed:
       1 Put the air-conditioning pack identification-plate/air-conditioning pack amendment-plate (53) in position on the replacement heat-exchanger unit (7).
       2 Install the screws (52).
NOTE: The air-conditioning pack identification-plate/air-conditioning pack amendment-plate (53) contains the serial number and the part number for the air conditioning pack.
       3 Tighten the screws (52).
     (b) If the air-conditioning pack identification-plate (51) and the air-conditioning pack amendment-plate (53) are removed:
       1 Put the air-conditioning pack identification-plate (51) and the air-conditioning pack amendment-plate (53) in position on the replacement heat-exchanger unit (7).
       2 Install the screws (52).
NOTE: The air-conditioning pack identification-plate (51) and the air-conditioning pack amendment-plate (53) contain the serial number and the part number for the air conditioning pack.
       3 Tighten the screws (52).
   (2) Clean the duct and the sleeve sealing surfaces as follows:
     (a) Remove the blanking caps from the applicable ducts and flanges.
     (b) Remove all the particles from the sealing surfaces with a Textile-Lint free Cotton - (Material No.14SBA1) and Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) .
     (c) Dry the sealing surfaces fully.
   (3) Examine the duct and the sleeve sealing surfaces as follows:
     (a) Make sure that there are no distortion, scratches and blemishes on the seal mating surfaces of the items that follow:
  • The duct (15)
  • The flanges (4), (10), (17), (70) and (76)
  • The pipe assembly (91)
  • All the other related seal mating surfaces.
     (b) Make sure that the seal location grooves in the sleeves (3), (16), (72) and (88) are not damaged or twisted.
   (4) Install the seals (Ref. AMM TASK 20-26-00-910-002):
     (a) Carefully put the new seals in the sleeves as follows:
       1 Put the new AIPC 21-52-41-29-130 SEAL (87) in the sleeve (88).
       2 Put the new AIPC 21-52-41-29-200 SEAL (71) in the sleeve (72).
       3 Put the new AIPC 21-52-41-28-050 SEAL (77) in the sleeve (91).
       4 For the left heat-exchanger unit (7):
       5 For the right heat-exchanger unit (7):
   (5) Install the ducts, the pipe assemblies and the sleeves as follows:
     (a) During installation, turn the ducts, the sleeves and the pipe assemblies to prevent damage to the seals in the sleeves.
   (6) Put the sleeve (3) in position on the heat exchanger unit (7), and move it on the heat exchanger unit as far as it goes.
   (7) Put the sleeve (88) in position on the flange (4), and move it on the flange as far as it goes.
   (8) Put the duct (15) in position in the sleeve (16).
   (9) Put the sleeve (16) in position on the heat exchanger unit (7), and move it on the heat exchanger unit (7) as far as it goes:
     (a) Put the sleeve (72) in position on the flange (70), and move it on the flange as far as it goes.
     (b) Apply a small quantity of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the mating surfaces of the retaining cables (92).
     (c) Hold the hexagonal part of the retaining cables (92).
     (d) Connect the retaining cables (92) with the holes in the flange (76):
       1 Install the new AIPC 21-52-41-28-070 WASHER (73) and the new AIPC 21-52-41-28-060 NUT (74).
NOTE: The retaining cables (92) will twist if you do not hold the hexagonal part of the retaining cables (92).
     (e) TORQUE the nuts (74) to between 0.85 and 0.8 m.daN (75.22 and 70.80 lbf.in ) T.
Subtask 21-52-24-420-055-A ** ON A/C NOT FOR ALL
C. Preparation for Installation
   (1) Prepare the parts for installation:
     (a) Make sure that the parts retained from the removed component are clean and in the correct condition.
     (b) Clean the component interfaces and the adjacent area.
     (c) Prepare the surface of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-803).
     (d) Make sure that:
       1 For the left heat-exchanger unit (10HM4):
  • The seals (43) and (47) are in good condition.
       2 For the right heat-exchanger unit (11HM4):
  • The seals (143) and (147) are in good condition.
     (e) If necessary, replace the seals:
       1 For the left heat-exchanger unit (10HM4):
         a The AIPC 21-52-03-14-016 SEAL (43) and the AIPC 21-52-03-14-015 SEAL (47).
       2 For the right heat-exchanger unit (11HM4):
         a The AIPC 21-52-03-20-016 SEAL (143) and the AIPC 21-52-03-20-015 SEALS (147).
     (f) Apply a small quantity of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the mating surfaces of the retaining cables (75), (90) and (96).
   (2) Make sure that the lip seal (11) is correctly installed and in good condition. If necessary, replace the plenum chamber (Ref. AMM TASK 21-52-22-000-001) and (Ref. AMM TASK 21-52-22-400-001).
   (3) Remove the protective cover from the cooling elements of the heat exchanger unit (7).
   (4) Install the inlet plenum (46):
     (a) For the left heat-exchanger unit (10HM4):
       1 Put the seals (43) and (47) and the inlet plenum (46) in position on the heat exchanger unit (7).
       2 Install the screws (48), the washers (49) and the nuts (50).
       3 TORQUE the screws (48) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T.
       4 Put the bonding strap (41) in position and install the screw (42), the washer (44) and the nut (45).
       5 Tighten the screw (42).
       6 Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
     (b) For the right heat-exchanger unit (11HM4):
       1 Put the seals (143) and (147) and the inlet plenum (46) in position on the heat exchanger unit (7).
       2 Install the screws (48), the washers (49) and the nuts (50).
       3 TORQUE the screws (48) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T.
       4 Put the bonding strap (41) in position and install the screw (42), the washer (44) and the nut (45).
       5 Tighten the screw (42).
       6 Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
   (5) Put the clamp (9) and the sleeve (8) in position on the heat exchanger unit (7).
   (6) Tighten the clamp (9).
Subtask 21-52-24-420-051-A ** ON A/C NOT FOR ALL
D. Installation of the Heat Exchanger Unit
NOTE: It is not necessary for the bonding strap (34) to be installed during installation of the heat exchanger unit.
   (1) Turn the sleeves, when you move or install them. This will help to prevent damage to the seals in the sleeves.
   (2) Make sure that the bolts (40) and (56) are tightened correctly and the additional washers (39) and (57) are installed.
   (3) Install the heat exchanger unit:
WARNING: SUPPORT THE UNIT/ASSEMBLY. THE UNIT/ASSEMBLY IS HEAVY. IF YOU DO NOT SUPPORT IT, IT WILL FALL. THIS CAN CAUSE INJURY TO PERSONS, AND/OR DAMAGE TO EQUIPMENT.
     (a) Carefully put the heat exchanger unit (7) in position in the aircraft.
NOTE: The heat exchanger unit weighs approximately 40 kg (88.18 lb).
     (b) Install the bushing (38), (if necessary, washer (39)), bolt (40), washer (36) and nut (35).
     (c) Put the support rods (80), (82) and (83) in position at the heat exchanger unit (7).
     (d) Install the bushings (58), (if necessary, washers (57)), bolts (56), washers (55) and nuts (54).
   (4) Get access to the fan plenum outlet and feel the lip seal (11) with your fingers to make sure that it is correctly installed.
   (5) Put the duct (15) in position, and install the clamp (14).
   (6) TORQUE the clamp (14) to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in ) T.
   (7) Move the sleeve (16) and make sure that the "Z" dimensions are approximately equal.
   (8) Move the sleeve (3) in position on the heat exchanger unit (7) until you get the 4 MM (0.16 IN.).
   (9) Put the clamp (2) in position, and move it until you get the 4 MM (0.16 IN.).
   (10) Tighten the clamp (2).
   (11) Do a check of the "X" and the "Y" dimensions at the sleeves (16) and (3).
     (a) For the "X" dimension:
  • Measure the maximum and the minimum "X" dimensions around the circumference of the sleeve (16)
  • The difference between the maximum and the minimum "X" dimensions must not be more than 1.7 MM (0.07 IN.).
     (b) For the "Y" dimension:
  • Measure the maximum and the minimum "Y" dimensions around the circumference of the sleeve (3)
  • The difference between the maximum and the minimum "Y" dimensions must not be more than 1.2 MM (0.05 IN.).
     (c) You can get the tolerance of 1.7 MM (0.07 IN.) and 1.2 MM (0.05 IN.), if you adjust the support rod(s) (1) and(or) (83):
       1 Safety the support rod(s) (1) and(or) (83) after you adjust them.
NOTE: The adjustment of the support rod (1) will give you a vertical difference.
NOTE: The adjustment of the support rod (83) will give you a lateral difference.
NOTE: You can only adjust the support rods (1) and (83).
   (12) Put the sleeve (13) in position on the heat exchanger unit (7), and install the clamp (12).
   (13) TORQUE the clamp (12) to between 0.12 and 0.10 m.daN (10.62 and 8.85 lbf.in ) T.
   (14) Put the bonding strap (41) in position, and install the washer (32), the screw (31) and the nut (33) (Ref. AMM TASK 20-28-00-912-802).
   (15) Put the bellows (6) in position, and install the clamp (5).
   (16) Tighten the clamp (5).
   (17) Move the sleeve (72) in position on the flange (17).
   (18) Make sure that the retaining cables (75) are in line with the holes in the flange (17).
   (19) Hold the hexagonal part of the retaining cables (75).
   (20) Put the retaining cables (75) in position in the flange (17), and install the new AIPC 21-52-41-29-100 WASHER (73) and the new AIPC 21-52-41-29-090 NUT (74).
NOTE: The retaining cables (75) will twist, if you do not hold the hexagonal part of the retaining cables (75).
   (21) Make sure that the retaining cables (90) are in line with the holes in the flange (10).
   (22) Hold the hexagonal part of the retaining cables (90).
   (23) Put the retaining cables (90) in position in the flange (10), and install the new AIPC 21-52-41-28-070 WASHER (73) and the new AIPC 21-52-41-28-060 NUT (74).
NOTE: The retaining cables (90) will twist, if you do not hold the hexagonal part of the retaining cables (90).
   (24) Hold the hexagonal part of the retaining cables (75) and (90).
   (25) TORQUE the nuts (74) to between 0.85 and 0.8 m.daN (75.22 and 70.80 lbf.in ) T.
NOTE: The retaining cables (75) and (90) will twist, if you do not hold the hexagonal part of the retaining cables (75) and (90).
NOTE: This will give a safe and flexible connection.
   (26) Clean the remaining Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) from the retaining cables parts (75), (90) and (96).
   (27) Install the pipe assembly (Ref. AMM TASK 21-52-23-400-001):
     (a) Do not install the access panel at this time.
   (28) Install the ram-air outlet (Ref. AMM TASK 21-61-52-400-003):
     (a) Do not install the access panel at this time.
   (29) Make sure that the work area is clean and clear of tools and other items.
Subtask 21-52-24-420-055-B ** ON A/C NOT FOR ALL
E. Preparation for Installation
   (1) Prepare the parts for installation:
     (a) Make sure that the parts retained from the removed component are clean and in the correct condition.
     (b) Clean the component interfaces and the adjacent area.
     (c) Prepare the surface of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-803).
     (d) Make sure that:
       1 For the left heat-exchanger unit (10HM4):
  • The seals (43) and (47) are in good condition.
       2 For the right heat-exchanger unit (11HM4):
  • The seals (143) and (147) are in good condition.
     (e) If necessary, replace the seals:
       1 For the left heat-exchanger unit (10HM4):
         a The AIPC 21-52-03-14-016 SEAL (43) and the AIPC 21-52-03-14-015 SEAL (47).
       2 For the right heat-exchanger unit (11HM4):
         a The AIPC 21-52-03-20-016 SEAL (143) and the AIPC 21-52-03-20-015 SEALS (147).
     (f) Apply a small quantity of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the mating surfaces of the retaining cables (75), (90) and (96).
   (2) Remove the protective cover from the cooling elements of the heat exchanger unit (7).
   (3) Install the inlet plenum (46):
     (a) For the left heat-exchanger unit (10HM4):
       1 Put the seals (43) and (47) and the inlet plenum (46) in position on the heat exchanger unit (7).
       2 Install the screws (48), the washers (49) and the nuts (50).
       3 TORQUE the screws (48) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T.
       4 Put the bonding strap (41) in position and install the screw (42), the washer (44) and the nut (45).
       5 Tighten the screw (42).
       6 Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
     (b) For the right heat-exchanger unit (11HM4):
       1 Put the seals (143) and (147) and the inlet plenum (46) in position on the heat exchanger unit (7).
       2 Install the screws (48), the washers (49) and the nuts (50).
       3 TORQUE the screws (48) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T.
       4 Put the bonding strap (41) in position and install the screw (42), the washer (44) and the nut (45).
       5 Tighten the screw (42).
       6 Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
   (4) Put the clamp (9) and the sleeve (8) in position on the heat exchanger unit (7).
   (5) Tighten the clamp (9).
Subtask 21-52-24-420-051-B ** ON A/C NOT FOR ALL
F. Installation of the Heat Exchanger Unit
NOTE: It is not necessary for the bonding strap (34) to be installed during installation of the heat exchanger unit.
   (1) Turn the sleeves, when you move or install them. This will help to prevent damage to the seals in the sleeves.
   (2) Make sure that the bolts (40) and (56) are tightened correctly and the additional washers (39) and (57) are installed.
   (3) Install the heat exchanger unit:
WARNING: SUPPORT THE UNIT/ASSEMBLY. THE UNIT/ASSEMBLY IS HEAVY. IF YOU DO NOT SUPPORT IT, IT WILL FALL. THIS CAN CAUSE INJURY TO PERSONS, AND/OR DAMAGE TO EQUIPMENT.
     (a) Carefully put the heat exchanger unit (7) in position in the aircraft.
NOTE: The heat exchanger unit weighs approximately 40 kg (88.18 lb).
     (b) Install the bushing (38), (if necessary, washer (39)), bolt (40), washer (36) and nut (35).
     (c) Put the support rods (80), (82) and (83) in position at the heat exchanger unit (7).
     (d) Install the bushings (58), (if necessary, washers (57)), bolts (56), washers (55) and nuts (54).
   (4) Examine the air cycle machine to lip seal installation:
NOTE: This step is not applicable to the plenum chamber part number 1816A0000-01 or 1816B0000-01.
     (a) Get access to the fan plenum outlet and feel the lip seal (11) with your fingers to make sure that it is correctly installed.
   (5) Put the duct (15) in position, and install the clamp (14).
   (6) TORQUE the clamp (14) to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in ) T.
   (7) Move the sleeve (16) and make sure that the "Z" dimensions are approximately equal.
   (8) Move the sleeve (3) in position on the heat exchanger unit (7) until you get the 4 MM (0.16 IN.).
   (9) Put the clamp (2) in position and move it until you get the 4 MM (0.16 IN.).
   (10) Tighten the clamp (2).
   (11) Do a check of the "X" and the "Y" dimensions at the sleeves (16) and (3).
     (a) For the "X" dimension:
  • Measure the maximum and the minimum "X" dimensions around the circumference of the sleeve (16)
  • The difference between the maximum and the minimum "X" dimensions must not be more than 1.7 MM (0.07 IN.).
     (b) For the "Y" dimension:
  • Measure the maximum and the minimum "Y" dimensions around the circumference of the sleeve (3),
  • The difference between the maximum and the minimum "Y" dimensions must not be more than 1.2 MM (0.05 IN.).
     (c) You can get the tolerance of 1.7 MM (0.07 IN.) and 1.2 MM (0.05 IN.), if you adjust the support rod(s) (1) and(or) (83).
       1 Safety the support rod(s) (1) and(or) (83) after you adjust them.
NOTE: The adjustment of the support rod (1) will give you a vertical difference.
NOTE: The adjustment of the support rod (83) will give you a lateral difference.
NOTE: You can only adjust the support rods (1) and (83).
   (12) Put the sleeve (13) in position on the heat exchanger unit (7), and install the clamp (12).
   (13) TORQUE the clamp (12) to between 0.12 and 0.10 m.daN (10.62 and 8.85 lbf.in ) T.
   (14) Put the bonding strap (41) in position, and install the washer (32), the screw (31) and the nut (33) (Ref. AMM TASK 20-28-00-912-802).
   (15) Put the bellows (6) in position, and install the clamp (5).
   (16) Tighten the clamp (5).
   (17) Move the sleeve (72) in position on the flange (17).
   (18) Make sure that the retaining cables (75) are in line with the holes in the flange (17).
   (19) Hold the hexagonal part of the retaining cables (75).
   (20) Put the retaining cables (75) in position in the flange (17), and install the new AIPC 21-52-41-29-100 WASHER (73) and the new AIPC 21-52-41-29-090 NUT (74).
NOTE: The retaining cables (75) will twist, if you do not hold the hexagonal part of the retaining cables (75).
   (21) Make sure that the retaining cables (90) are in line with the holes in the flange (10).
   (22) Hold the hexagonal part of the retaining cables (90).
   (23) Put the retaining cables (90) in position in the flange (10), and install the new AIPC 21-52-41-28-070 WASHER (73) and the new AIPC 21-52-41-28-060 NUT (74).
NOTE: The retaining cables (90) will twist, if you do not hold the hexagonal part of the retaining cables (90).
   (24) Hold the hexagonal part of the retaining cables (75) and (90).
   (25) TORQUE the nuts (74) to between 0.85 and 0.8 m.daN (75.22 and 70.80 lbf.in ) T.
NOTE: The retaining cables (75) and (90) will twist, if you do not hold the hexagonal part of the retaining cables (75) and (90).
NOTE: This will give a safe and flexible connection.
   (26) Clean the remaining Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) from the retaining cables parts (75), (90) and (96).
   (27) Install the pipe assembly (Ref. AMM TASK 21-52-23-400-001):
     (a) Do not install the access panel at this time.
   (28) Install the ram-air outlet (Ref. AMM TASK 21-61-52-400-003):
     (a) Do not install the access panel at this time.
   (29) Make sure that the work area is clean and clear of tools and other items.
Subtask 21-52-24-420-055-D ** ON A/C NOT FOR ALL
G. Preparation for Installation
   (1) Prepare the parts for installation:
     (a) Make sure that the parts retained from the removed component are clean and in the correct condition.
     (b) Clean the component interfaces and the adjacent area.
     (c) Prepare the surface of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-803).
     (d) Make sure that:
       1 For the left heat-exchanger unit (10HM4):
  • The seal (228) is in good condition.
       2 For the right heat-exchanger unit (11HM4):
  • The seals (143) and (147) are in good condition.
     (e) If necessary, replace the seals:
       1 For the left heat-exchanger unit (10HM4):
       2 For the right heat-exchanger unit (11HM4):
     (f) Apply a small quantity of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the mating surfaces of the retaining cables (75), (90) and (96).
   (2) Make sure that the lip seal (11) is correctly installed and in good condition. If necessary, replace the plenum chamber (Ref. AMM TASK 21-52-22-000-001) and (Ref. AMM TASK 21-52-22-400-001).
   (3) Remove the protective cover from the cooling elements of the heat exchanger unit (7).
   (4) Install the inlet plenums (46) and (230) as follows:
     (a) For the left heat-exchanger unit (10HM4):
       1 Put the seal (228) and the inlet plenum (230) in position on the heat exchanger unit (7).
       2 Install the screws (220), the washers (225) and the nuts (224).
       3 TORQUE the screws (220) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T.
       4 Install the screws (226), the washers (225) and the nuts (224).
       5 TORQUE the screws (226) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T.
       6 Put the bonding straps (221), (222) and (227) in position and install the screws (223), the washers (225) and the nuts (224).
       7 Tighten the screws (223).
       8 Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
     (b) For the right heat-exchanger unit (11HM4):
       1 Put the seals (143) and (147) and the inlet plenum (46) in position on the heat exchanger unit (7).
       2 Install the screws (48), the washers (49) and the nuts (50).
       3 TORQUE the screws (48) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in ) T.
       4 Put the bonding strap (41) in position and install the screw (42), the washer (44) and the nut (45).
       5 Tighten the screw (42).
       6 Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
   (5) Put the clamp (9) and the sleeve (8) in position on the heat exchanger unit (7).
   (6) Tighten the clamp (9).
Subtask 21-52-24-420-051-D ** ON A/C NOT FOR ALL
H. Installation of the Heat Exchanger Unit
NOTE: It is not necessary for the bonding strap (34) to be installed during installation of the heat exchanger unit.
   (1) Turn the sleeves when you move or install them. This will help to prevent damage to the seals in the sleeves.
   (2) Make sure that the bolts (40) and (56) are tightened correctly and the additional washers (39) and (57) are installed.
   (3) Installation of the heat exchanger unit:
WARNING: SUPPORT THE UNIT/ASSEMBLY. THE UNIT/ASSEMBLY IS HEAVY. IF YOU DO NOT SUPPORT IT, IT WILL FALL. THIS CAN CAUSE INJURY TO PERSONS, AND/OR DAMAGE TO EQUIPMENT.
     (a) Carefully put the heat exchanger unit (7) in position in the aircraft.
NOTE: The heat exchanger unit weighs approximately 40 kg (88.18 lb).
     (b) Install the bushing (38), (if necessary, washer (39)), bolt (40), washer (36) and nut (35).
     (c) Put the support rods (80), (82) and (83) in position on the heat exchanger unit (7).
     (d) Install the bushings (58), (if necessary, washers (57)), bolts (56), washers (55) and nuts (54).
   (4) Get access to the fan plenum outlet and with your fingers feel the area around the lip seal (11) to make sure that it is correctly installed.
   (5) Put the duct (15) in position, and install the clamp (14).
   (6) TORQUE the clamp (14) to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in ) T.
   (7) Move the sleeve (16) and make sure that the "Z" dimensions are approximately equal.
   (8) Move the sleeve (3) in position on the heat exchanger unit (7) until you get 4 mm (0.16 in.) dimension.
   (9) Put the clamp (2) in position and move it until you get 4 mm (0.16 in.) dimension.
   (10) Tighten the clamp (2).
   (11) Do a check of the "X" and "Y" dimensions at the sleeves (16) and (3).
     (a) For the "X" dimension:
  • Measure the maximum and minimum "X" dimensions around the circumference of the sleeve (16)
  • The difference between the maximum and minimum "X" dimensions must not be more than 1.7 mm (0.07 in.).
     (b) For the "Y" dimension:
  • Measure the maximum and minimum "Y" dimensions around the circumference of the sleeve (3)
  • The difference between the maximum and minimum "Y" dimensions must not be more than 1.2 mm (0.05 in.).
     (c) You can get the tolerance of 1.7 mm (0.07 in.) and 1.2 mm (0.05 in.), if you adjust the support rod(s) (1) and(or) (83).
       1 Safety the support rod(s) (1) and(or) (83) after you adjust them.
NOTE: The adjustment of the support rod (1) will give you a vertical difference.
NOTE: The adjustment of the support rod (83) will give you a lateral difference.
NOTE: You can only adjust the support rods (1) and (83).
   (12) Put the sleeve (13) in position on the heat exchanger unit (7), and install the clamp (12).
   (13) TORQUE the clamp (12) to between 0.12 and 0.10 m.daN (10.62 and 8.85 lbf.in ) T.
   (14) Put the bonding strap (41) in position and install the washer (32), the screw (31) and the nut (33) (Ref. AMM TASK 20-28-00-912-802).
   (15) Put the bellows (6) in position, and install the clamp (5).
   (16) Tighten the clamp (5).
   (17) Move the sleeve (72) in position on the flange (17).
   (18) Make sure that the retaining cables (75) are in line with the holes in the flange (17).
   (19) Hold the hexagonal part of the retaining cables (75).
   (20) Put the retaining cables (75) in position in the flange (17), and install a new AIPC 21-52-41-29-100 WASHER (73) and a new AIPC 21-52-41-29-090 NUT (74).
NOTE: The retaining cables (75) will twist, if you do not hold the hexagonal part of the retaining cables (75).
   (21) Make sure that the retaining cables (90) are in line with the holes in the flange (10).
   (22) Hold the hexagonal part of the retaining cables (90).
   (23) Put the retaining cables (90) in position in the flange (10) and install a new AIPC 21-52-41-28-070 WASHER (73) and a new AIPC 21-52-41-28-060 NUT (74).
NOTE: The retaining cables (90) will twist, if you do not hold the hexagonal part of the retaining cables (90).
   (24) Hold the hexagonal part of the retaining cables (75) and (90).
   (25) TORQUE the nuts (74) to between 0.85 and 0.8 m.daN (75.22 and 70.80 lbf.in ) T.
NOTE: The retaining cables (75) and (90) will twist, if you do not hold the hexagonal part of the retaining cables (75) and (90).
NOTE: This will give a safe and flexible connection.
   (26) Clean the remaining Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) from the retaining cables parts (75) and (90).
   (27) Install the pipe assembly (Ref. AMM TASK 21-52-23-400-001):
     (a) Do not install the access panel at this time.
   (28) Install the ram-air outlet (Ref. AMM TASK 21-61-52-400-003):
     (a) Do not install the access panel at this time.
   (29) Put the sleeves (201) in position on the ducts (203) and (204).
   (30) Put the ducts (203) and (204) and the bonding straps (205) and (206) in position.
   (31) Install a new AIPC 21-58-03-01-450 SEAL (231) or AIPC 21-58-83-01-660 SEAL (231).
   (32) Install the screws (210), the washers (209) and (207) and the nuts (208).
   (33) TORQUE the nuts (208) to between 0.40 and 0.33 m.daN (35.40 and 29.20 lbf.in ) T.
   (34) Install the clamps (202).
   (35) Tighten the clamp (202).
CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.
   (36) For the left heat-exchanger unit (10HM4):
     (a) Remove the CAP-BLANKING from each electrical connector and receptacle.
     (b) Connect the electrical connector (211) to the temperature sensor (215).
     (c) Connect the electrical connector (212) to the pressure sensor (214).
     (d) Connect the electrical connector (213) to the bypass valve (216).
   (37) Make sure that the work area is clean and clear of tools and other items.
Subtask 21-52-24-865-055-A
I. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
FOR FIN: 10HM4 (HEAT EXCHANGER UNIT)
49VUAIR COND/TEMP CTL/SYS 1 CHAN B/28VDC52HHD08
** ON A/C NOT FOR ALL
121VUIGGS/CTRL7YAN28
** ON A/C NOT FOR ALL
121VUIGGS/CTRL7YAP28
** ON A/C NOT FOR ALL
122VUAIR COND/PACK TEMP/CTL SYS1/1/115VAC1HHX22
122VUAIR COND/PACK TEMP/CTL SYS1/1/28VDC3HHX21
122VUAIR COND/PACK TEMP CTL SYS2/1/28VDC4HHY19
122VUAIR COND/PACK TEMP CTL SYS2/1/115VAC2HHY18
** ON A/C NOT FOR ALL
122VUAIR COND/TEMP CTL SYS 1/CHAN A/115VAC49HHX22
122VUAIR COND/TEMP CTL SYS 1/CHAN A/28VDC51HHX21
122VUAIR COND/TEMP CTL SYS 1/CHAN B/115VAC50HHY18
** ON A/C NOT FOR ALL
122VUCSAS / CTRL1HWU17
** ON A/C NOT FOR ALL
FOR FIN: 11HM4 (HEAT EXCHANGER UNIT)
122VUAIR COND/PACK TEMP/CTL SYS1/2/115VAC21HHW22
122VUAIR COND/PACK TEMP/CTL SYS1/2/28VDC23HHW21
122VUAIR COND/PACK TEMP CTL SYS2/2/28VDC24HHY21
122VUAIR COND/PACK TEMP CTL SYS2/2/115VAC22HHY20
** ON A/C NOT FOR ALL
122VUAIR COND/TEMP CTL SYS 2/CHAN A/115VAC53HHW22
122VUAIR COND/TEMP CTL SYS 2/CHAN A/28VDC55HHW21
122VUAIR COND/TEMP CTL SYS 2/CHAN B/28VDC56HHY21
122VUAIR COND/TEMP CTL SYS 2/CHAN B/115VAC54HHY20
Subtask 21-52-24-710-050-A ** ON A/C NOT FOR ALL
J. Test(s)
   (1) Do the pre-conditioning through the HP ground connector (Ref. AMM TASK 12-33-21-618-001) or with the APU (Ref. AMM TASK 12-33-21-618-001).
   (2) Do a leak check of the heat exchanger unit connections.
NOTE: Minimum leakage is permitted. After the pack operates for some minutes, the leakage of air will decrease because the seals have their correct operating temperature.
   (3) After approximately 15 minutes, stop the pre-conditioning (Ref. AMM TASK 12-33-21-618-001) or (Ref. AMM TASK 12-33-21-618-001).
   (4) Do the operational test of the cockpit and the cabin temperature control (Ref. AMM TASK 21-63-00-710-004).
Subtask 21-52-24-710-050-B ** ON A/C NOT FOR ALL
J. Test(s)
   (1) Do the pre-conditioning through the HP ground connector (Ref. AMM TASK 12-33-21-618-001) or with the APU (Ref. AMM TASK 12-33-21-618-001).
   (2) Do a leak check of the heat exchanger unit connections.
NOTE: Minimum leakage is permitted. After the pack operates for some minutes, the leakage of air will decrease because the seals have their correct operating temperature.
   (3) After approximately 15 minutes, stop the pre-conditioning (Ref. AMM TASK 12-33-21-618-001) or (Ref. AMM TASK 12-33-21-618-001).
   (4) For the left heat-exchanger unit (10HM4):
     (a) Do the operational test of the conditioned service-air system with bleed air (Ref. AMM TASK 21-58-00-710-002).
     (b) Examine the joints for signs of air leakage.
   (5) Do the operational test of the cockpit and the cabin temperature control (Ref. AMM TASK 21-63-00-710-004).
5. Close-up
Subtask 21-52-24-410-051-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Install these access panels on the belly fairing structure (Ref. AMM TASK 53-35-13-400-002):
     (a) FOR [10HM4] (HEAT EXCHANGER UNIT)
     (b) FOR [11HM4] (HEAT EXCHANGER UNIT)
   (3) Remove the WARNING NOTICE(S).
Subtask 21-52-24-862-050-A
B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
[Rev.10 from 2021] 2026.03.31 23:07:04 UTC
"Aviabrain" 2025