DOC AIRBUS | AMM A320FRemoval of the Pylon Bleed Duct Assembly
TASK 36-11-49-000-830-A
Removal of the Pylon Bleed Duct Assembly
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 36-11-49-861-117-A
Subtask 36-11-49-020-148-A
[Rev.10 from 2021]
2026.04.01 01:11:45 UTC
Removal of the Pylon Bleed Duct Assembly
WARNING:
MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.
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:
YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.
WARNING:
PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
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.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE |
| No specific | AR | PLUG - BLANKING |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| 98D27803000000 | 1 | LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION |
| 98L12003001000 | 1 | HARNESS,SAFETY |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 410 | ENG 1 PYLON BOX AND FORWARD FAIRING |
| 420 | ENG 2 PYLON BOX AND FORWARD FAIRING |
| 450 | ENG 1 THRUST REVERSER & EXHAUST SECTION |
| 460 | ENG 2 THRUST REVERSER & EXHAUST SECTION |
| 191DB | |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1) | |
| 411AL, 413AT, 413BT, 413CT, 437AL, 438AR, 451AL, 452AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2) | |
| 421AL, 423AT, 423BT, 423CT, 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-00-00-481-002-A | Installation of the Wingrip |
| 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 27-00-00-480-002-A | Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000) |
| TASK 36-11-53-000-803-A | Removal of the Overpressure Valve |
| 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 54-52-11-000-807-A | Removal of the Access Skin Panels |
| TASK 71-00-51-000-803-A | Removal of the Power Plant with 2D Bootstrap |
| TASK 71-13-00-010-803-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-803-A | Closing of the Fan Cowl Doors |
| TASK 78-30-00-040-807-A | Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU) |
| TASK 78-36-00-010-806-A | Opening of the Thrust Reverser Cowl Doors |
| TASK 78-36-00-410-806-A | Closing of the Thrust Reverser Cowl Doors |
| TASK 80-12-49-000-802-A | Removal of the Starter Air Duct (from the Pylon to the Starter Air Valve (SAV)) |
Pylon Bleed DuctsSubtask 36-11-49-861-117-A
A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).
Subtask 36-11-49-941-136-A (Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).
B. Safety Precautions
(1) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(2) On AIR COND panel 30VU:
(a) Make sure that the ENG 1(2) BLEED pushbutton switch is released (OFF legend on).
(b) Make sure that the APU BLEED pushbutton switch is released (ON legend off).
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.
(3) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(4) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR 1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
(5) On access door 191DB, on the HP ground connector:
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.
(6) Put on and attach a 98L12003001000 HARNESS,SAFETY before you start work in the work area (Ref. AMM TASK 12-00-00-481-002).
(7) On FLAPS panel 114VU:
(a) Put the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION in position on the flap/slat control lever (Ref. AMM TASK 27-00-00-480-002).
(b) Put a WARNING NOTICE(S) in position on the flap/slat control lever to tell persons not to operate the flap/slat controls.
(8) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position.
Subtask 36-11-49-865-204-A (1) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(2) On AIR COND panel 30VU:
(a) Make sure that the ENG 1(2) BLEED pushbutton switch is released (OFF legend on).
(b) Make sure that the APU BLEED pushbutton switch is released (ON legend off).
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.
(3) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(4) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR 1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
(5) On access door 191DB, on the HP ground connector:
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.
(6) Put on and attach a 98L12003001000 HARNESS,SAFETY before you start work in the work area (Ref. AMM TASK 12-00-00-481-002).
(7) On FLAPS panel 114VU:
(a) Put the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION in position on the flap/slat control lever (Ref. AMM TASK 27-00-00-480-002).
(b) Put a WARNING NOTICE(S) in position on the flap/slat control lever to tell persons not to operate the flap/slat controls.
(8) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position.
C. Open, safety and tag this(these) circuit breaker(s):
Subtask 36-11-49-010-239-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | AIR BLEED/ENG 2/MONG | 3HA2 | D12 |
| 49VU | AIR BLEED/ENG 1/CTL | 2HA1 | D11 |
| 122VU | AIR BLEED/ENG 1/MONG | 3HA1 | Z23 |
| 122VU | AIR BLEED/ENG 2/CTL | 2HA2 | Z22 |
D. Get Access
(1) Remove the access panels (Ref. AMM TASK 54-52-11-000-807):
411AL 413AT 413BT 413CT
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
421AL 423AT 423BT 423CT
Subtask 36-11-49-010-268-A (1) Remove the access panels (Ref. AMM TASK 54-52-11-000-807):
NOTE: It is only necessary to remove the panels that give access to the duct(s) that you remove.
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)411AL 413AT 413BT 413CT
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
421AL 423AT 423BT 423CT
E. Removal of the Components
(1) If you must remove the lower bleed elbow (27) and/or if you must change/replace the T-duct (57), remove the engine (Ref. AMM TASK 71-00-51-000-803).
Subtask 36-11-49-010-269-A (1) If you must remove the lower bleed elbow (27) and/or if you must change/replace the T-duct (57), remove the engine (Ref. AMM TASK 71-00-51-000-803).
F. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR
Subtask 36-11-49-040-161-A (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR
G. Deactivation of the Thrust Reverser for Maintenance
Subtask 36-11-49-010-240-A WARNING:
YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-807). H. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL, 462AR
4. Procedure(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL, 462AR
Subtask 36-11-49-020-148-A
A. Preparation for the Removal of the Forward Starter Duct and the Starter Duct
(1) If you use the APU to energize the electrical circuits, stop the APU:
(a) Make sure that the pressure and the temperature of the bleed-air duct system are in ambient conditions.
(a) Remove the coupling (23), seal (24) and engine starter air-duct (22) (Ref. AMM TASK 80-12-49-000-802).
(4) Do not change the rigging of the adjustable rods (9) and (14).
(5) Remove the bolt (13), washer (12) and nut (10) from the rod (9) and the forward starter duct (11).
(6) Remove the bolt (15), washer (16) and nut (17) from the rod (14) and the forward starter duct (11).
Subtask 36-11-49-410-206-A (1) If you use the APU to energize the electrical circuits, stop the APU:
- For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86)
- For APS 3200 APU (Ref. AMM D/O 49-00-00-86)
- For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-009).
(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) If the engine is not removed: (a) Remove the coupling (23), seal (24) and engine starter air-duct (22) (Ref. AMM TASK 80-12-49-000-802).
(4) Do not change the rigging of the adjustable rods (9) and (14).
(5) Remove the bolt (13), washer (12) and nut (10) from the rod (9) and the forward starter duct (11).
(6) Remove the bolt (15), washer (16) and nut (17) from the rod (14) and the forward starter duct (11).
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL, 462AR
Subtask 36-11-49-410-207-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL, 462AR
C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR
Subtask 36-11-49-020-157-A (1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR
D. Removal of the Forward Starter Duct and the Starter Duct
(1) Remove the forward starter duct (11).
(a) Remove the coupling (20) from the forward starter duct (11) and the starter duct (5).
(b) Remove the four bolts (18) and washers (19) from the forward starter duct (11) and hold the duct (11).
(c) Carefully remove the forward starter duct (11).
(d) Remove and discard the seal (21).
(e) Put PLUG - BLANKING on the forward starter duct (11).
(2) Remove the starter duct (5).
(b) Remove the two bolts (3) and bushings (4) from the starter duct (5) and the rod (2).
(c) Remove the bolt (7) and bushing (8) from the starter duct (5) and the rod (6) and hold the starter duct (5).
(d) Carefully remove the starter duct (5) (make it move forward).
(e) Remove and discard the seal (53).
(f) Put PLUG - BLANKING on the starter duct (5).
Subtask 36-11-49-020-156-A (1) Remove the forward starter duct (11).
(a) Remove the coupling (20) from the forward starter duct (11) and the starter duct (5).
(b) Remove the four bolts (18) and washers (19) from the forward starter duct (11) and hold the duct (11).
(c) Carefully remove the forward starter duct (11).
(d) Remove and discard the seal (21).
(e) Put PLUG - BLANKING on the forward starter duct (11).
(2) Remove the starter duct (5).
NOTE: Do not change the rigging of the adjustable rods.
(a) Remove the coupling (52) from the starter duct (5) and the bellows (54). (b) Remove the two bolts (3) and bushings (4) from the starter duct (5) and the rod (2).
(c) Remove the bolt (7) and bushing (8) from the starter duct (5) and the rod (6) and hold the starter duct (5).
(d) Carefully remove the starter duct (5) (make it move forward).
(e) Remove and discard the seal (53).
(f) Put PLUG - BLANKING on the starter duct (5).
E. Removal of the T-duct, Bleed Duct and Lower Bleed Elbow
(1) Remove the T-duct (57) with the bellows (54), shims (65), clamps (52), (55), (63) and (67), seals (53), (56), (62) and (66), bolts (59) and (61), washer (58) and bushing (60) (Ref. AMM TASK 36-11-53-000-803).
(2) Remove the bleed duct (1):
(a) Remove the four bolts (48) and washers (47).
(b) Remove the two half plates (50) and (51).
(c) Remove and discard the glass-fiber yarn braid (49).
(d) Do Steps 3.F. thru 3.H.
(e) Record the position of the coupling (25).
(f) Remove the coupling (25) from the lower bleed elbow (27) and the bleed duct (1).
(g) Do Steps 4.B. and 4.C.
(h) Remove the bleed duct (1).
(i) Put PLUG - BLANKING on the bleed duct (1).
(3) Remove the lower bleed elbow (27).
(b) Remove the nut (42), bolt (44) and bushing (43) from the lower bleed elbow (27) and the rod (41).
(c) Remove the nut (38), bolt (40) and bushing (39) from the lower bleed elbow (27) and the rod (37).
(d) Remove the nut (31), bolt (29) and bushing (30) from the lower bleed elbow (27) and the rod (28).
(e) Hold the lower bleed elbow (27) and remove the nut (36), bolt (32) and bushings (33) and (35) from the lower bleed elbow (27) and the bracket (34).
(f) Remove the lower bleed elbow (27).
(g) Remove and discard the seal (26).
(h) Put PLUG - BLANKING on the lower bleed elbow (27).
(1) Remove the T-duct (57) with the bellows (54), shims (65), clamps (52), (55), (63) and (67), seals (53), (56), (62) and (66), bolts (59) and (61), washer (58) and bushing (60) (Ref. AMM TASK 36-11-53-000-803).
(2) Remove the bleed duct (1):
(a) Remove the four bolts (48) and washers (47).
(b) Remove the two half plates (50) and (51).
(c) Remove and discard the glass-fiber yarn braid (49).
(d) Do Steps 3.F. thru 3.H.
(e) Record the position of the coupling (25).
(f) Remove the coupling (25) from the lower bleed elbow (27) and the bleed duct (1).
(g) Do Steps 4.B. and 4.C.
(h) Remove the bleed duct (1).
(i) Put PLUG - BLANKING on the bleed duct (1).
(3) Remove the lower bleed elbow (27).
NOTE: You must carefully remove the bushings and retain them for the installation.
NOTE: Do not change the rigging of the adjustable rods.
(a) Do Steps 3.F. thru 3.H. (b) Remove the nut (42), bolt (44) and bushing (43) from the lower bleed elbow (27) and the rod (41).
(c) Remove the nut (38), bolt (40) and bushing (39) from the lower bleed elbow (27) and the rod (37).
(d) Remove the nut (31), bolt (29) and bushing (30) from the lower bleed elbow (27) and the rod (28).
(e) Hold the lower bleed elbow (27) and remove the nut (36), bolt (32) and bushings (33) and (35) from the lower bleed elbow (27) and the bracket (34).
(f) Remove the lower bleed elbow (27).
(g) Remove and discard the seal (26).
(h) Put PLUG - BLANKING on the lower bleed elbow (27).