Installation of the Pressure Relief Valve (APS 3200)

TASK 49-91-43-400-002-A
Installation of the Pressure Relief Valve (APS 3200)

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.

WARNING: BE CAREFUL WHEN YOU DRAIN THE ENGINE OIL AND/OR LOOSEN THE FILLER CAP. HOT OIL CAN SPILL PAST THE FILLER CAP WHEN THE OIL LEVEL IS ABOVE THE 'ADD' RANGE (MARKED ON THE SIGHT GLASS).

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	Torque wrench: range to between 40 and 35 lbf.in (0.45 and 0.40 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
No specific	19-507 CORROSION RESISTANT STEEL LOCKWIRE

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
1	PACKING	AIPC 49-91-04-50-110
2	PACKING	AIPC 49-91-04-50-120
1	PACKING	AIPC 49-91-84-20-130
2	PACKING	AIPC 49-91-84-20-140

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 49-00-00-710-008-A	Operational Test of the APU
TASK 49-90-00-600-004-A	Check Oil Level and Replenish (APS 3200)
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
Pressure Relief Valve

3. Job Set-up
Subtask 49-91-43-860-052-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 the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.
(3) Make sure that there is a warning notice in the cockpit to tell persons not to start the APU.
(4) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
(5) Make sure that the access platform is in position below the APU compartment.
(6) Make sure that the APU access doors are open (Ref. AMM TASK 52-41-00-010-001).
(7) Make sure that the LIGHT control switch 11LJ is set to the on position.

Subtask 49-91-43-865-058-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

4. Procedure
Subtask 49-91-43-420-052-A ** ON A/C NOT FOR ALL

A. Installation of the Pressure Relief Valve

Pressure Relief Valve ** ON A/C NOT FOR ALL

(1) Apply Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the new AIPC 49-91-04-50-110 PACKING (1) or AIPC 49-91-84-20-130 PACKING (1) and the new AIPC 49-91-04-50-120 PACKING (2) or AIPC 49-91-84-20-140 PACKING (2).
(2) Install the new packings (1) and (2) on the pressure relief valve (3).
(3) Install the pressure relief valve (3) on the APU gearbox.
(4) TORQUE the pressure relief valve (3) to between 40 and 35 lbf.in (0.45 and 0.40 m.daN )

.
(5) Safety the pressure relief valve (3) with 19-507 CORROSION RESISTANT STEEL LOCKWIRE.
(6) Fill the APU oil reservoir (Ref. AMM TASK 49-90-00-600-004).

Subtask 49-91-43-865-060-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 49-91-43-790-052-A ** ON A/C NOT FOR ALL

C. Leak Test of the Pressure Relief Valve

Pressure Relief Valve ** ON A/C NOT FOR ALL

(1) Start and operate the APU (Ref. AMM TASK 49-00-00-710-008) for min. 5 minutes.
(a) Examine the joint of the pressure relief valve (3) and the APU for leaks.

NOTE: Leaks are not permitted.

(2) Stop the APU (Ref. AMM TASK 49-00-00-710-008).

5. Close-up
Subtask 49-91-43-410-052-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 the LIGHT control switch 11LJ to the off position.
(3) Close the APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the access platform(s).

Subtask 49-91-43-860-053-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Put the related hydraulic system in the pressurized configuration (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).

[Rev.10 from 2021] 2026.04.01 01:33:22 UTC