Removal of the Primary and Secondary Fuel-Nozzle (131-9(A))

TASK 49-31-41-000-003-A
Removal of the Primary and Secondary Fuel-Nozzle (131-9(A))

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

WARNING: MAKE SURE THAT YOU HAVE THE CORRECT FIRE FIGHTING EQUIPMENT AVAILABLE.

CAUTION: MAKE SURE THAT THE FUEL-FEED SYSTEM DOES NOT HAVE ANY LEAKS. LEAKS IN THE FUEL-FEED SYSTEM CAN CAUSE A FIRE.

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 4M (13 FT)-ADJUSTABLE
No specific	AR	CONTAINER 10 L(2 1/2 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 28-00-00-910-001-A	Fuel Safety Procedures
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
Fuel Nozzles and Manifolds

3. Job Set-up
Subtask 49-31-41-860-056-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) On the panel 25VU, make sure that the APU MASTER SW p/bsw is OFF.
(3) Put a warning notice in the cockpit to tell persons not to start the APU.
(4) Obey the fuel safety procedure (Ref. AMM TASK 28-00-00-910-001).
(5) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).

Subtask 49-31-41-865-056-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 49-31-41-010-053-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below the APU access doors 315AL and 316AR.
(2) Open the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-010-001).
(3) Set the LIGHT control SW 11LJ to the ON position.

4. Procedure
Subtask 49-31-41-020-057-A ** ON A/C NOT FOR ALL

A. Removal of the Nozzles

NOTE: Do not remove all the fuel nozzles at the same time. The nozzles keep the correct combustor assembly aligned.

(1) Remove the safety pins (7) from the fuel nozzle bolts (5).
(2) Remove the locking plate (6).
(3) Put the CONTAINER 10 L(2 1/2 USGAL) below the fuel manifold assembly.
(4) Disconnect the fuel supply pipes for the primary manifold (10) and the secondary manifold (8) at the flow divider.
(5) Let unwanted fuel drain into the container.
(6) Put the PLUG-BLANKING in each disconnected line end.
(7) Disconnect the manifold connectors (4) at the fuel nozzle (3).
(8) Remove the bolts (5), the nozzle (3), the packing (2) and the air shroud (1).
(9) Discard the packing (2).
(10) Remove the container.

[Rev.10 from 2021] 2026.04.01 12:43:00 UTC