W DOC AIRBUS | AMM A320F

Removal of the Upper Bleed-Air Duct

TASK 36-11-49-000-010-B
Removal of the Upper Bleed-Air Duct

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
ACCESS PLATFORM 1M(3 FT)
No specific
AR
COVER - PROTECTION
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
WARNING NOTICE(S)
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR
 C. Referenced Information
REFERENCE
DESIGNATION
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 49-00-00-860-009-A
APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01
APU Shutdown by Batteries (131-9(A))
TASK 71-13-00-010-010-A
Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A
Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-32-00-010-010-A
Opening of the Thrust Reverser Halves
F Upper Bleed-Air Duct
3. Job Set-up
Subtask 36-11-49-861-057-A ** ON A/C NOT FOR ALL
A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).
Subtask 36-11-49-941-072-A ** ON A/C NOT FOR ALL
B. Safety Precautions
   (1) Make sure that the engine 1(2) shutdown occured not less than 5 minutes before you do this procedure.
   (2) On the AIR COND panel 30VU:
  • make sure that the ENG 1(2) BLEED pushbutton switch is released (the OFF legend is on),
  • make sure that the APU BLEED pushbutton switch is released (the ON legend is off),
  • put a WARNING NOTICE(S) to tell persons not to operate the pneumatic system.
   (3) On the ENG panel 115VU:
  • put a WARNING NOTICE(S) to tell persons not to start the engine 1(2).
   (4) On the HP ground connector:
  • put a WARNING NOTICE(S) to tell persons not to pressurize the pneumatic system.
   (5) On the ENG section of the maintenance panel 50VU:
  • make sure that the ON legend of the ENG/FADEC GND PWR 1(2) pushbutton switch is off,
  • put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 36-11-49-865-105-A ** ON A/C NOT FOR ALL
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR BLEED/ENG 1/CTL3HA1D12
49VUAIR BLEED/ENG 1/MONG2HA1D11
122VUAIR BLEED/ENG 2/CTL3HA2Z23
122VUAIR BLEED/ENG 2/MONG2HA2Z22
Subtask 36-11-49-010-060-A ** ON A/C NOT FOR ALL
D. Get Access
   (1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
     (a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
     (b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
   (2) Put an ACCESS PLATFORM 1M(3 FT) in position below the engine.
Subtask 36-11-49-040-071-A ** ON A/C NOT FOR ALL
E. Deactivate the Thrust Reverser
WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
   (1) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).
Subtask 36-11-49-010-084-A ** ON A/C NOT FOR ALL
F. Get Access
   (1) Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
     (a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
     (b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
4. Procedure
Subtask 36-11-49-020-061-A ** ON A/C NOT FOR ALL
A. Removal of the Upper Bleed-Air Duct
F Upper Bleed-Air Duct ** ON A/C NOT FOR ALL
   (1) If you use the APU to energize the electrical circuits, stop the APU:
   (2) In the cockpit, on the SD bleed page:
     (a) Make sure that the pressure and the temperature of the bleed-air duct system are in ambient conditions.
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 UNIT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).
   (3) Remove the connecting rods (8) from the upper duct (2) as follows:
     (a) Record the position and location of the components for the installation procedure:
  • The nuts (10)
  • The washers (9)
  • The flanged bushes (6)
  • The bolts (7)
  • The connecting rods (8)
  • The seal (3)
  • The couplings (1) and (4)
  • The duct (2).
     (b) Remove the nuts (10) from the rod connection points.
     (c) Hold the washers (9) while you remove the bolts (7) and the flanged bushes (6) from the support lugs (5).
     (d) Remove the washers (9) and the connecting rods (8) from the duct support lugs (5).
   (4) Remove the upper duct (2) as follows:
     (a) Hold the duct (2) and remove the couplings (1) and (4).
     (b) Remove the duct (2).
     (c) Remove and discard the seal (3).
   (5) Put an applicable COVER - PROTECTION on the ducts and the pressure-regulating shut-off valve.
[Rev.10 from 2021] 2026.04.01 01:10:56 UTC
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