Removal of the Pneumatic System Tubes and Hoses

TASK 36-11-49-000-047-A
Removal of the Pneumatic System Tubes and Hoses

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.

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)-ADJUSTABLE
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 49-00-00-860-006-A	APU Shutdown by External Power
TASK 49-00-00-860-006-A-01	APU Shutdown by Batteries
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 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
Pneumatic System Tubes and Hoses

3. Job Set-up
Subtask 36-11-49-861-068-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 36-11-49-941-060-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Make sure that the engine 1(2) shutdown occurred 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 36-11-49-865-065-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

Subtask 36-11-49-010-055-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position in zone 450 for engine 1 and in zone 460 for engine 2.

Subtask 36-11-49-040-065-A ** ON A/C NOT FOR ALL

E. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 36-11-49-010-098-A ** ON A/C NOT FOR ALL

F. Open the thrust reverser cowl doors (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

4. Procedure
Subtask 36-11-49-020-055-A ** ON A/C NOT FOR ALL

A. Remove the Pressure Regulator Valve (PRV) to Interface Hose Assembly
(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 TASK 49-00-00-860-006)
For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-009).

(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) Disconnect the hose assembly (5) from the engine tube.
(4) Disconnect the hose assembly (5) from the bleed PRV (50).
(5) Put COVER - PROTECTION on the hose assembly (5), the engine tube and the PRV (50).
(6) Remove the hose assembly (5) from the engine.

Subtask 36-11-49-020-092-A ** ON A/C NOT FOR ALL

B. Remove the Flexible Metal Pneumatic Hose Assembly
(1) Disconnect the hose assembly (10) from the engine tube.
(2) Disconnect the hose assembly (10) from the tube assembly (25).
(3) Put COVER - PROTECTION on the hose assembly (10) and the tube assembly (25).
(4) Remove the hose assembly (10) from the engine.

Subtask 36-11-49-020-093-A ** ON A/C NOT FOR ALL

C. Removal of the Mid Stage Tee Duct to Pylon Interface Tube Assembly
(1) Disconnect the hose assembly (10) from the tube assembly (25).

NOTE: Use a second wrench to hold the fitting on the tube assembly when you loosen the coupling nut on the hose.

(2) Remove the bolts (15) and the clamps (20) that attach the tube assembly (25) to the brackets at engine flange Sta. 221 (B9). (Two locations).
(3) Remove the clamps (20) from the tube assembly (25).
(4) Remove the bolt (15) and the clamp (20) that attach the tube assembly (25) to the bracket at engine flange Sta. 215 (B8).
(5) Remove the clamp (20) from the tube assembly (25).
(6) Disconnect the tube assembly (25) from the union (35) on the mid stage tee duct.

NOTE: Use a second wrench to hold the union when you loosen the coupling nut on the tube.

(7) If necessary, remove the union (35) from the mid stage tee duct.
(8) Put COVER - PROTECTION on the tube assembly (25), the union (35), and the hose (10).
(9) Remove the tube assembly (25) from the engine.

Subtask 36-11-49-020-094-C ** ON A/C NOT FOR ALL

D. Removal of the PRV to HPV Tube Assembly
(1) Disconnect the hose tube assembly (40) from the bleed pressure regulator valve (50).
(2) Remove the bolt (15) and the clamp (20) that attach the hose tube assembly (40) to the bracket at engine flange Sta. 215 (B8).
(3) Remove the bolt (15), the nut (45) and the clamp (20) that attach the hose tube assembly (40) to the bracket at engine flange Sta. 215 (B8).
(4) Remove the clamps (20) from the hose tube assembly (40).
(5) Disconnect the tube assembly (40) from the HP regulator valve (30).
(6) Put COVER - PROTECTION on the two ends of the hose tube assembly (40) and the fittings on the valves (30) and (50).
(7) Remove the hose tube assembly (40) from the engine.

[Rev.10 from 2021] 2026.04.01 12:38:52 UTC