Installation of the Heat Exchanger Unit (Into the Air Conditioning Pack)

TASK 21-52-24-400-001-A-01
Installation of the Heat Exchanger Unit (Into the Air Conditioning Pack)

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 REMOVE OR INSTALL THIS EQUIPMENT. THIS EQUIPMENT IS HEAVY (MORE THAN 12 KG (26.5 lb)) AND CAN CAUSE INJURY AND/OR DAMAGE.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

NOTE: The procedure is the same for heat-exchanger units 10HM4 and 11HM4.

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	Torque wrench: range to between 0.12 and 0.10 m.daN (10.62 and 8.85 lbf.in )
No specific	Torque wrench: range to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )
No specific	Torque wrench: range to between 0.85 and 0.8 m.daN (75.22 and 70.80 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.03QBD1)	Dry lubricant-General Assembly Graphite -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [10HM4] (HEAT EXCHANGER UNIT)
191BB, 191KB
FOR [11HM4] (HEAT EXCHANGER UNIT)
192FB, 192KB

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
84	SEAL 64 INSTL	AIPC 21-52-03-11-420
85	SEAL 64 INSTL	AIPC 21-52-03-11-420
86	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
184	SEAL	AIPC 21-52-03-17-340
185	SEAL 64 INSTL	AIPC 21-52-03-17-340
186	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

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 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 20-28-00-912-803-A	Bonding Surface Preparation
TASK 21-52-23-400-001-A	Installation of the Pipe Assembly between the Main Heat Exchanger and the Air Cycle Machine
TASK 21-52-41-400-001-A	Installation of the Air Conditioning Pack
TASK 21-58-00-710-002-A	Operational Test of the Conditioned Service Air System with Bleed Air
TASK 21-63-00-710-004-A	Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU
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
Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL
Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 21-52-24-860-050-A

A. Aircraft Maintenance Configuration
(1) 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)

191BB
191KB.

(b) FOR [11HM4] (HEAT EXCHANGER UNIT)

192FB
192KB.

4. Procedure
Subtask 21-52-24-560-050-A

A. Preparation of the Replacement Component

Heat Exchanger Unit - Component Location ** ON A/C NOT FOR ALL

(1) Remove the air-conditioning pack identification-plate/air-conditioning pack amendment-plate:
(a) If the air-conditioning pack identification-plate/air-conditioning pack amendment-plate (53) is installed:
1 Remove the screws (52).
2 Remove the air-conditioning pack identification-plate/air-conditioning pack amendment-plate (53) from the heat exchanger unit (7).

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.

(b) If the air-conditioning pack identification-plate and the air-conditioning pack amendment-plate are installed:
1 Remove the screws (52).
2 Remove the air-conditioning pack identification-plate (51) from the heat exchanger unit (7).
3 Remove the air-conditioning pack amendment-plate (53) from the heat exchanger unit (7).

NOTE: The air-conditioning pack identification-plate and air-conditioning pack amendment-plate contain the serial number and the part number for the air conditioning pack.

(2) Install the air-conditioning pack identification-plate/air-conditioning pack amendment-plate:
(a) If one of the air-conditioning pack identification-plate/air-conditioning pack amendment-plate (53) is removed:
1 Install the screws (52).
2 Tighten the screws (52).
3 Install the air-conditioning pack identification-plate/air-conditioning pack amendment-plate (53) on the heat exchanger unit (7).

NOTE: These steps are necessary as these plates have the data for the air conditioning pack.

(b) If the air-conditioning pack identification-plate and the air-conditioning pack amendment-plate are removed:
1 Install the screws (52).
2 Tighten the screws (52).
3 Install the air-conditioning pack identification-plate (51) on the heat exchanger unit (7).
4 Install the air-conditioning pack amendment-plate (53) on the heat exchanger unit (7).

NOTE: These steps are necessary as these plates have the data for the air conditioning pack.

Subtask 21-52-24-420-053-A

B. 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) Prepare the surface of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-803).
(2) Turn the sleeves (16), (88), (72), (78) and (79) when you move or install them.
(3) Prepare the attachment parts for the installation:
(a) Remove the PLUG-BLANKING from each disconnected line end.
(b) Clean the component interfaces and the adjacent area.
(c) Make sure that the parts retained from the removed component are clean and in the correct condition.
(d) Make sure that:
1 For the left heat-exchanger unit (10HM4):

The seals (43), (47), (87), (71), (77) and (84) or the alternative seals (85) and (86) are in good condition.

2 For the right heat-exchanger unit (11HM4):

The seals (87), (71), (77), (143), (147) and (184) or the alternative seals (185) and (186) are in good condition.

(e) If necessary, replace the seals:
1 For the left heat-exchanger unit:

The AIPC 21-52-03-14-015 SEAL (47) and/or the AIPC 21-52-03-14-016 SEAL (43), the AIPC 21-52-41-29-130 SEAL (87), the AIPC 21-52-41-29-200 SEAL (71), the AIPC 21-52-41-28-050 SEAL (77), the AIPC 21-52-03-11-420 SEAL 64 INSTL (84) or the alternative AIPC 21-52-03-11-420 SEAL 64 INSTL (85) and the AIPC 21-52-03-11-420 SEAL 64 INSTL (86).

2 For the right heat-exchanger unit:

The AIPC 21-52-03-20-015 SEALS (147) and/or the AIPC 21-52-03-20-016 SEAL (143), the AIPC 21-52-41-29-130 SEAL (87), the AIPC 21-52-41-29-200 SEAL (71), the AIPC 21-52-41-28-050 SEAL (77), the AIPC 21-52-03-17-340 SEAL (184) or the alternative AIPC 21-52-03-17-340 SEAL 64 INSTL (185) and the AIPC 21-52-03-17-340 SEAL (186).

CAUTION: USE ONLY THE SPECIFIED LUBRICANT TO LUBRICATE THE O-RINGS AND THE PACKINGS. OTHER LUBRICANTS CAN CAUSE SMOKE OR A SMELL IN THE CABIN WHEN THEY BECOME HOT.

(f) Apply a small quantity of Dry lubricant-General Assembly Graphite - (Material No.03QBD1) to the seals before you install them.
(g) Do not use lubricant for the installation of ABS1040-XXX seals.
(h) Apply a small quantity of Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the mating surfaces of the retaining cables (75) and (90).
(4) Install the heat exchanger unit as follows:

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 on the air conditioning pack.

NOTE: The heat exchanger unit weighs approximately 36 kg (79.3664 lb).

(b) Put the sleeve (72) in position on the flange (17).
(c) Put the retaining cables (75) in position on 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).
(d) Put the sleeve (79) in position on the flange (10).
(e) Put the retaining cables (90) in position on 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).
(f) Put the retaining cables (96) in position on the flange (4), and install the new AIPC 21-52-41-29-100 WASHER (73) and the new AIPC 21-52-41-29-090 NUT (74).
(g) Put the sleeve (88) in position on the flange (4).
(h) TORQUE the nuts (74) to between 0.85 and 0.8 m.daN (75.22 and 70.80 lbf.in )

.
(i) Clean the remaining Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) from the retaining cables (96).
(5) Install pipe assembly 10HM (11HM) (Ref. AMM TASK 21-52-23-400-001):
(a) Do not install the access panel(s) at the same time.
(6) Put the clamp (12) and the sleeve (13) in position on the heat exchanger unit (7).
(7) TORQUE the clamp (12) to between 0.12 and 0.10 m.daN (10.62 and 8.85 lbf.in )

.
(8) Put the sleeve (16) and the duct (15) in position on the heat exchanger unit (7).
(9) Remove the protective cover from the cooling elements of the heat exchanger unit (7).
(10) 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).
(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).
(11) Install the screws (48), the washers (49) and the nuts (50).
(12) TORQUE the screws (48) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(13) Put the bonding strap (41) in position and install the screw (42), the washer (44) and the nut (45).
(14) Tighten the screw (42).
(15) Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
(16) Put the clamp (9) and the sleeve (8) in position on the heat exchanger unit (7).
(17) Tighten the clamp (9).
(18) Install air-conditioning pack 10HM (11HM) (Ref. AMM TASK 21-52-41-400-001).

Subtask 21-52-24-710-051-A ** ON A/C NOT FOR ALL

C. 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) (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 21-52-24-710-051-B ** ON A/C NOT FOR ALL

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) (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 21-52-24-410-052-A

A. Close Access
(1) Install these access panels on the belly fairing structure (Ref. AMM TASK 53-35-13-400-002):
(a) FOR [10HM4] (HEAT EXCHANGER UNIT)

191KB
191BB.

(b) FOR [11HM4] (HEAT EXCHANGER UNIT)

192KB
192FB.

[Rev.10 from 2021] 2026.04.02 06:11:28 UTC