Installation of the Gearbox Vent Tube

TASK 49-26-55-400-801-A
Installation of the Gearbox Vent Tube

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

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 5M (16 FT)- ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 42 and 38 lbf.in (0.47 and 0.43 m.daN )
No specific	Torque wrench: range to between 52.5 and 47.5 lbf.in (0.59 and 0.54 m.daN )
No specific	Torque wrench: range to between 189 and 171 lbf.in (2.14 and 1.93 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03PBB1)	Lubricant-Anti Seize High Temp. -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	PACKING	AIPC 49-21-09-01-030

E. 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 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 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 52-41-00-010-001-A	Open the APU Doors for Access
TASK 52-41-00-410-001-A	Close the APU Doors after Access
Gearbox Vent Tube

3. Job Set-up
Subtask 49-26-55-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(2) On panel 25VU, make sure that the APU MASTER SW p/bsw is in the OFF position.
(3) On panel 25VU, make sure that the WARNING NOTICE(S) to tell persons not to start the APU is in position.
(4) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).

Subtask 49-26-55-865-051-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 49-26-55-010-051-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE is in position below APU access doors 315AL and 316AR.
(2) Make sure that APU access doors 315AL and 316AR are open (Ref. AMM TASK 52-41-00-010-001).
(3) Set light switch 11LJ to the ON position.

4. Procedure
Subtask 49-26-55-420-051-A ** ON A/C NOT FOR ALL

A. Installation of the Gearbox Vent Tube

CAUTION: WHEN YOU REMOVE/INSTALL THE PARTS, BE CAREFUL NOT TO HIT THE COMPONENTS ADJACENT TO THE APU. DAMAGE TO THESE COMPONENTS CAN OCCUR.

(1) Install the union fitting (6) in the turbine bearing housing.
(a) TORQUE the union fitting (6) to between 42 and 38 lbf.in (0.47 and 0.43 m.daN )

.
(2) Apply Lubricant-Anti Seize High Temp. - (Material No.03PBB1) to the threads of the union fitting (6).
(3) Install the packings (2) in the gearbox vent tube (1). If necessary, install new AIPC 49-21-09-01-030 PACKING (2).
(4) Install the grommets of the gearbox vent tube (1) in the clamps of the APU.
(5) Install the grommets of the wiring harness in the clamps of the gearbox vent tube (1).
(6) Connect the gearbox vent tube (1) to the union fitting (6) with the nut (5).

CAUTION: YOU MUST USE TWO WRENCHES AND HOLD THE COMPONENT WHEN YOU REMOVE/INSTALL THE PIPE COUPLINGS AND/OR UNIONS. THIS PREVENTS DAMAGE TO THE COMPONENT.

(a) TORQUE the nut (5) to between 189 and 171 lbf.in (2.14 and 1.93 m.daN )

.
(7) Connect the gearbox vent tube (1) to the air/oil separator adapter (3) with the retainer bolt (4).
(a) TORQUE the retainer bolt (4) to between 52.5 and 47.5 lbf.in (0.59 and 0.54 m.daN )

.
(8) Make sure that the gearbox vent tube (1) is correctly installed in the air/oil separator adapter (3).
(9) Make sure that the retainer of the gearbox vent tube (1) is flush with the surface of the air/oil separator adapter (3).

5. Close-up
Subtask 49-26-55-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Set light switch 11LJ to the OFF position.
(3) Close APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the access platform(s).

Subtask 49-26-55-865-052-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 49-26-55-860-052-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Pressurize the aircraft hydraulic systems
(Ref. AMM TASK 29-00-00-864-001).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(3) Remove the WARNING NOTICE(S).
(4) Put the aircraft back to its initial configuration.

[Rev.10 from 2021] 2026.04.01 01:29:18 UTC