W DOC AIRBUS | AMM A320F

Installation of the Mixer Unit

TASK 21-21-43-400-002-A
Installation of the Mixer Unit

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: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.
WARNING: DO NOT TOUCH THE COMPONENT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS.
CAUTION: BE VERY CAREFUL WHEN YOU DO WORK ON OR NEAR THE AIR-CONDITIONING DUCTS. THE DUCTS ARE MADE OF THIN MATERIAL AND YOU CAN EASILY BREAK THEM.
CAUTION: DO NOT PUT YOUR WEIGHT ON THE DUCTS. IT IS VERY EASY TO BREAK THEM.
ZONE: 130
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
ACCESS PLATFORM 2M (6 FT)
No specific
1
PROTRACTOR
No specific
AR
TIE WRAP(S)
No specific
AR
WARNING NOTICE(S)
No specific
Torque wrench: range to between 1.0 and 0.5 m.daN (88.50 and 44.25 lbf.in ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.14QEB1)
Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
130
FWD CARGO COMPT AFT BULKHEAD OF AVNCS COMPT TO FWD PRESSURE BULKHEAD OF WING CENTER BOX
191CB, 191DB, 825
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
7
SEAL
AIPC 21-21-02-43-055
7
SEAL
AIPC 21-21-82-40-240
39
SEAL
AIPC 21-63-03-07-120
42
INSULATION
AIPC 21-63-03-07-160
41
BLANKET-INSULATION
AIPC 21-63-03-07-170
24
GASKET-FLANGE
AIPC 21-63-03-07-200
42
INSULATION
AIPC 21-63-03-08-170
41
INSULATION
AIPC 21-63-03-08-180
24
GASKET-FLANGE
AIPC 21-63-03-08-210
21
O-RING
AIPC 21-63-03-10-050
39
SEAL
AIPC 21-63-83-03-050
41
BLANKET-INSULATION
AIPC 21-63-83-03-070
24
GASKET-FLANGE
AIPC 21-63-83-03-130
42
INSULATION
AIPC 21-63-83-03-180
21
O-RING
AIPC 21-63-83-07-050
 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 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 25-54-12-000-001-A
Removal of the Forward Cargo-Compartment Partition
TASK 25-54-12-400-001-A
Installation of the Forward Cargo-Compartment Partition
TASK 52-30-00-860-001-A
Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A
Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 06-41-53-00
FUSELAGE-DESCRIPTION AND OPERATION
F Mixer Unit ** ON A/C NOT FOR ALL
F Mixer Unit ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 21-21-43-860-051-A
A. Aircraft Maintenance Configuration
   (1) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
Subtask 21-21-43-865-051-A
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR COND/TEMP CTL/SYS 1 CHAN B/28VDC52HHD08
** ON A/C NOT FOR ALL
122VUAIR COND/FLOW/MIXER/FLAP3HBV22
122VUAIR COND/ZONE TEMP CTL/28VDC/SYS24HKV20
122VUAIR COND/ZONE TEMP CTL/28VDC/SYS13HKV19
122VUAIR COND/ZONE TEMP CTL/115VAC/SYS22HKV18
122VUAIR COND/ZONE TEMP CTL/115VAC/SYS11HKV17
** ON A/C ALL
122VUAIR COND/RECIRC FAN/R/CTL11HGW20
122VUAIR COND/RECIRC FAN/R/SPLY3HGW18
122VUAIR COND/RECIRC FAN/L/CTL2HGX20
122VUAIR COND/RECIRC FAN/L/SPLY1HGX18
** 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 1/CHAN A/115VAC49HHX22
122VUAIR COND/TEMP CTL SYS 1/CHAN A/28VDC51HHX21
122VUAIR COND/TEMP CTL SYS 2/CHAN B/28VDC56HHY21
122VUAIR COND/TEMP CTL SYS 2/CHAN B/115VAC54HHY20
122VUAIR COND/TEMP CTL SYS 1/CHAN B/115VAC50HHY18
Subtask 21-21-43-941-053-A
C. Safety Precautions
   (1) On the overhead panel, on panel 30VU, make sure that:
     (a) The APU BLEED pushbutton switch is in the off position (the ON legend is off).
     (b) The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
     (c) The PACK 1 and the PACK 2 pushbutton switches are in the off position (the OFF legends are on).
     (d) The HOT AIR pushbutton switch is in the off position (the OFF legend is on).
     (e) The WARNING NOTICE(S) to tell persons not to operate these pushbutton switches are in position.
   (2) Make sure that:
     (a) At access door 191DB, on the HP ground connector, a warning notice is in position to tell persons not to pressurize the pneumatic system.
     (b) At access door 191CB, on the LP ground connector, a warning notice is in position to tell persons not to pressurize the air conditioning system.
Subtask 21-21-43-010-052-A
D. Get Access
   (1) Make sure that:
     (a) The ACCESS PLATFORM 2M (6 FT) is in position below the forward cargo-compartment door (door 825).
     (b) The forward cargo-compartment door is open (Ref. AMM TASK 52-30-00-860-001).
     (c) The access panels at partition FR34 (Ref. AMM D/O 06-41-53-00) are removed (Ref. AMM TASK 25-54-12-000-001).
4. Procedure
Subtask 21-21-43-560-050-A
A. Preparation for Installation
   (1) Remove the PLUG-BLANKING from each disconnected line end.
   (2) Clean the component interfaces and the adjacent area.
   (3) Make sure that the parts retained from the removed component are clean and in the correct condition.
   (4) Make sure that the O-rings (21), the seal (7), the flange gaskets (24) and the packings (39) are in good condition.
   (5) If necessary, replace:
   (6) On the mixer unit (18):
     (a) Put the O-rings (21) in position on the sensors (15) and (20).
     (b) Install the sensors (15) and (20) on the mixer unit (18).
     (c) TORQUE the sensors (15) and (20) to between 1.0 and 0.5 m.daN (88.50 and 44.25 lbf.in ) T.
WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.
     (d) Safety the sensors (15) and (20) with 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.
     (e) Put the flange gaskets (24) in position on the supply ducts (23) and (25).
     (f) Put the supply duct (25) in position on the mixer unit (18) and install the washers (26) and the screws (27).
     (g) Install the washer (30) and the nut (31).
     (h) Tighten the screws (27) and the nut (31).
     (i) Put the supply duct (23) in position on the mixer unit (18) and install the washers (33) and the screws (32).
     (j) Install the washer (29) and the nut (28).
     (k) Tighten the screws (32) and the nut (28).
     (l) Put the seal (7) and the flap assembly (5) in position on the mixer unit (18).
     (m) Install the bolts (6), the washers (8) and the nuts (9).
     (n) Tighten the nuts (9).
     (o) Install the packings (39) on the flanges of the supply ducts (23), (25), (44) and (45).
     (p) Install the sleeves (46) on the supply ducts (44) and (45).
Subtask 21-21-43-420-050-A
B. Installation of the Mixer Unit
   (1) Put the mixer unit (18) in position and install the washers (16) and the bolts (17).
   (2) Tighten the bolts (17).
   (3) Put the tie rod (34) in position on the mixer unit (18). If necessary, adjust the length of the tie rod (34).
   (4) Install the washer (37), the bolt (38), the washer (36) and the nut (35).
   (5) Tighten the nut (35).
   (6) Move the sleeves (46) equally on the flanges of the supply ducts (23), (25), (44) and (45).
CAUTION: MAKE SURE THAT EACH CLAMP IS CORRECTLY INSTALLED AND CLOSED. IF YOU HEAR A CLICK, IT IS NOT AN INDICATION THAT THE CLAMP IS CORRECTLY CLOSED. IF A CLAMP IS NOT CORRECTLY CLOSED, IT CAN OPEN SUDDENLY AND A LEAK CAN OCCUR.
   (7) Install the clamps (40) and close them correctly:
     (a) With the PROTRACTOR, make sure that the angular misalignment is less than the tolerance of 4 degrees around the centerline.
   (8) Install the sleeves (1), (10) and (12). Make sure that the sleeves (1), (10), and (12) are aligned with the color marks on the flanges of the mixer unit (18).
   (9) Install the sleeve (3). Make sure that the sleeve (3) is aligned with the color mark on the flap assembly (5).
   (10) Install the clamps (2), (4), (11) and (13).
   (11) Tighten the screws of the clamps (2), (4), (11) and (13).
   (12) Remove the CAP-BLANKING from each electrical connector and receptacle.
   (13) Make sure that all the electrical connections are clean and in the correct condition.
   (14) Connect the electrical connectors (14), (19) and (22).
Subtask 21-21-43-865-052-A
C. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR COND/FLOW/CTL &/IND11HBD07
** ON A/C NOT FOR ALL
49VUAIR COND/TEMP CTL/SYS 1 CHAN B/28VDC52HHD08
** ON A/C NOT FOR ALL
122VUAIR COND/FLOW/MIXER/FLAP3HBV22
122VUAIR COND/FLOW/CTL AND IND/22HBV21
122VUAIR COND/ZONE TEMP CTL/28VDC/SYS24HKV20
122VUAIR COND/ZONE TEMP CTL/28VDC/SYS13HKV19
122VUAIR COND/ZONE TEMP CTL/115VAC/SYS22HKV18
122VUAIR COND/ZONE TEMP CTL/115VAC/SYS11HKV17
122VUAIR COND/PACK TEMP/CTL SYS1/2/115VAC21HHW22
122VUAIR COND/PACK TEMP/CTL SYS1/2/28VDC23HHW21
122VUAIR COND/PACK TEMP/CTL SYS1/1/115VAC1HHX22
122VUAIR COND/PACK TEMP/CTL SYS1/1/28VDC3HHX21
122VUAIR COND/PACK TEMP CTL SYS2/2/28VDC24HHY21
122VUAIR COND/PACK TEMP CTL SYS2/2/115VAC22HHY20
122VUAIR COND/PACK TEMP CTL SYS2/1/28VDC4HHY19
122VUAIR COND/PACK TEMP CTL SYS2/1/115VAC2HHY18
** ON A/C ALL
122VUAIR COND/RECIRC FAN/R/CTL11HGW20
122VUAIR COND/RECIRC FAN/R/SPLY3HGW18
122VUAIR COND/RECIRC FAN/L/CTL2HGX20
122VUAIR COND/RECIRC FAN/L/SPLY1HGX18
** 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 1/CHAN A/115VAC49HHX22
122VUAIR COND/TEMP CTL SYS 1/CHAN A/28VDC51HHX21
122VUAIR COND/TEMP CTL SYS 2/CHAN B/28VDC56HHY21
122VUAIR COND/TEMP CTL SYS 2/CHAN B/115VAC54HHY20
122VUAIR COND/TEMP CTL SYS 1/CHAN B/115VAC50HHY18
Subtask 21-21-43-710-050-A
D. Test
   (1) Do the pre-conditioning through the HP ground connector (Ref. AMM TASK 12-33-21-618-001) or with the auxiliary power unit (Ref. AMM TASK 12-33-21-618-001).
   (2) Make sure that the recirculation fans operate correctly.
   (3) Do a leak check of the mixer unit (18) duct connections. Leaks are not permitted.
   (4) 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).
Subtask 21-21-43-420-052-A
E. Installation of the Insulation
   (1) Make sure that the insulations (41) and (42) are in good condition. If necessary, replace the AIPC 21-63-03-07-170 BLANKET-INSULATION (41) or the AIPC 21-63-83-03-070 BLANKET-INSULATION (41) or the AIPC 21-63-03-08-180 INSULATION (41) and/or the AIPC 21-63-03-07-160 INSULATION (42) or the AIPC 21-63-83-03-180 INSULATION (42) or the AIPC 21-63-03-08-170 INSULATION (42).
   (2) Install the insulations (41) and (42) and safety them with the new TIE WRAP(S) (43).
5. Close-up
Subtask 21-21-43-410-050-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Remove the WARNING NOTICE(S).
   (3) Install the access panels at partition FR34 (Ref. AMM D/O 06-41-53-00), (Ref. AMM TASK 25-54-12-400-001).
   (4) Close the forward cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).
   (5) Remove the access platform(s).
Subtask 21-21-43-862-050-A
B. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002)
[Rev.10 from 2021] 2026.04.02 06:10:54 UTC
"WTRUIB" 2025