Inspection of the APU (131-9(A)) after a Fire in the APU Compartment

TASK 49-00-00-200-003-A
Inspection of the APU (131-9(A)) after a Fire in the APU Compartment

WARNING: AFTER THE DISCHARGE OF AN ETOPS FIRE EXTINGUISHING BOTTLE, DO NOT GO INTO THE RELATED COMPARTMENT. WAIT A MINIMUM OF 2 HOURS AFTER OPERATION OF FIRE EXTINGUISHING BOTTLE 2 TO MAKE SURE THAT THE AIR IS SAFE TO BREATHE. AFTER DISCHARGE, THE EXTINGUISHING AGENT CAN FLOW FROM THE FIRE EXTINGUISHING SYSTEM (FES) FOR NINETY MINUTES. KEEP A CARGO COMPARTMENT DOOR OPEN FOR A MINIMUM OF 30 MINUTES AFTER THE FLOW OF EXTINGUISHING AGENT STOPS. THIS WILL MAKE SURE THAT THERE IS A GOOD FLOW OF AIR THROUGH THE CARGO COMPARTMENT. IF YOU DO NOT OBEY THESE PRECAUTIONS, THERE IS A RISK OF SUFFOCATION.

WARNING: DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

FIN: 4005KM ** ON A/C NOT FOR ALL

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	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
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 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 49-11-11-000-004-A	Removal of the Power Plant (APU) (131-9(A))
TASK 49-11-11-400-004-A	Installation of the Power Plant (APU) (131-9(A))
TASK 49-12-00-210-007-A	Detailed Visual Inspection of APU Suspension Rods, Shockmounts Structure incl. Brackets and Visible Part of Attachment Fittings (Airframe Side) (131-9(A))
TASK 49-16-00-200-002-A	Detailed Inspection of APU Air Intake, Diffuser Elbow, Seals and Felt Metal
TASK 49-81-00-200-017-A	General Visual Inspection of APU Compartment Exhaust Muffler Insulation Covers and Bellows (131-9(A))
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

3. Job Set-up
Subtask 49-00-00-860-143-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-41-00-861-002).
(2) Put a WARNING NOTICE(S) on the panel 24VU to tell persons not to operate the APU.
(3) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).

Subtask 49-00-00-865-142-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 49-00-00-010-081-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the APU access doors 315AL and 316AR.
(2) Open the APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-010-001) and safety them in the open position.
(3) Set the light SW 11LJ to the ON position.

4. Procedure
Subtask 49-00-00-210-074-A ** ON A/C NOT FOR ALL

A. General Visual Inspection of the APU
(1) Do an external inspection of the APU for the following indications:
(a) Hot, combustion and remaining smoke.
(b) Cracks on plastic, harness and clamps.
(c) Metal discoloration damage.
(d) Cracks on paint.
(2) Do an internal inspection of the APU for the following indications:
(a) Combustion and remaining smoke.
(b) Delamination of the external and internal surface of the APU inlet plenum.
(c) Too hot at gas-path walls of the inlet plenum.
(3) If any of the described indication is found, replace the APU (Ref. AMM TASK 49-11-11-000-004) and (Ref. AMM TASK 49-11-11-400-004).
(4) Examine the APU Air Intake (Ref. AMM TASK 49-16-00-200-002).
(5) Examine the APU Compartment (Ref. AMM TASK 49-81-00-200-017).
(6) Examine the APU Mounts (Ref. AMM TASK 49-12-00-210-007).

5. Close-up
Subtask 49-00-00-410-083-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 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 49-00-00-865-143-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 49-00-00-860-144-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) De-energize the ground service network
(Ref. AMM TASK 24-41-00-862-002).
(2) Remove the WARNING NOTICE(S).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 01:26:11 UTC