Removal of the Lube Pump-Filter Differential-Pressure Switch and Indicator (APS 3200)

TASK 49-91-23-000-001-A
Removal of the Lube Pump-Filter Differential-Pressure Switch and Indicator (APS 3200)

ZONE: 315
ZONE: 316

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 3M (10 FT)- ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315	TAIL CONE APU AND ACCESSORY COMPARTMENT
316	TAIL CONE APU AND ACCESSORY COMPARTMENT
315AL, 316AR

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 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from 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
Lube Pump-Filter Differential-Pressure Switch and Indicator

3. Job Set-up
Subtask 49-91-23-860-050-B ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.
(3) Put the WARNING NOTICE(S) 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).

Subtask 49-91-23-865-050-A ** ON A/C NOT FOR ALL

B. Open, safety and tag 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 49-91-23-010-050-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below APU access doors 315AL and 316AR.
(2) Open APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-010-001):
(3) Set LIGHT control switch 11LJ to the on position.

4. Procedure
Subtask 49-91-23-020-050-B ** ON A/C NOT FOR ALL

A. Removal of the Differential Pressure Switch and Indicator

Lube Pump-Filter Differential-Pressure Switch and Indicator ** ON A/C NOT FOR ALL

(1) Disconnect the electrical connector P6 (1) from the differential pressure switch and indicator (5).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the screws (4) from the differential pressure switch and indicator (5).
(4) Remove the differential pressure switch and indicator (5).
(5) Remove and discard the packing (2).
(6) Remove and discard the packing (3).

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