Reactivation of the APU Generator after Removal of the Substitution Kit

TASK 24-23-00-440-001-A
Reactivation of the APU Generator after Removal of the Substitution Kit

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

WARNING: USE THE CORRECT PERSONAL PROTECTION. OIL CAN HAVE ADDITIVE CALLED TRICRESYL PHOSPHATE IN IT. THIS CHEMICAL IS AN ASPHYXIANT, IT IS POISONOUS AND CAN BE ABSORBED THROUGH THE SKIN. USE CARE WHEN ENGINE OIL IS DRAINED. HOT OIL CAN POSSIBLY CAUSE BAD BURNS.

1. Reason for the Job
MMEL 24-23-01H
AC AUXILIARY GENERATION (APU GENERATOR, GCU OR GAPCU AUXILIARY POWER CONTROL FUNCTION, LINE CONTACTOR)
MMEL 24-23-01C
AC AUXILIARY GENERATION (APU GENERATOR, GCU OR GAPCU AUXILIARY POWER CONTROL FUNCTION, LINE CONTACTOR)
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 4M (13 FT)
No specific	AR	CAP - BLANKING
No specific	AR	CAP - BLANKING, PLASTIC
No specific	AR	CONTAINER 1 L (1/4 USGAL)
No specific	1	INSTALLATION TOOL - TIE WRAP
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-23-51-400-001-A	Installation of the APU Generator
TASK 24-23-51-400-001-A-01	Installation of the APU Generator with the Minilift Hoist
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
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
Components for Flight without an APU Generator Installed

3. Job Set-up
Subtask 24-23-00-860-053-A

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) On the APU section of the overhead panel 25VU, make sure that the APU MASTER SW pushbutton switch is released (the ON legend is off).
(3) Put a WARNING NOTICE(S) in position in the cockpit to tell persons not to start the APU.
(4) Make sure that the ground fire-extinguishing equipment is available.
(5) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).

Subtask 24-23-00-865-052-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 24-23-00-010-051-A

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

4. Procedure
Subtask 24-23-00-020-050-A

A. Removal of the Substitution Kit for Fight without an APU Generator Installed
(1) Disconnect the generator control cable from the connector on the cable support assembly (5).
(a) Remove the electrical connector (4).
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Temporarily attach the electrical connector (4) to the APU generator with a INSTALLATION TOOL - TIE WRAP.
(2) Disconnect the generator supply cables (3) from the terminal block on the cable support assembly (5).
(a) Remove the nut (17), washer (16), screw (12), washer (13), clamp (14) and spacer (15) from the generator cable support (5).
(b) Remove the nuts (2) and disconnect the generator supply cables (3).
(c) Temporarily install the nuts (2) on the studs of the terminal block on the cable support assembly (5).
(d) Put CAP - BLANKING, PLASTIC on the ring terminals of the disconnected generator supply cables (3).
(e) Temporarily attach the generator supply cables (3) with a tie-wrap to put it in stowage position in the APU compartment.
(3) Drain the remaining oil from the assembly cover (11).
(a) Put the CONTAINER 1 L (1/4 USGAL) in position below the generator pad (10).
(b) Remove and discard the lockwire from the drain plug (6).
(c) Remove the drain plug (6) and let the residual oil drain fully.
(d) Tighten the drain plug (6) and safety it with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(4) Remove the cable support assembly (5) and the assembly cover (11).
(a) Hold the cable support assembly (5) and the assembly cover (11) in the correct position.
(b) Remove and keep the nuts (1).
(c) Remove the cable support assembly (5) and the assembly cover (11).
(5) Remove the seal plate (4095KM) (7).
(a) Remove the seal (9).
(b) Remove the screws (8) and the seal plate (4095KM) (7).
(c) Remove the container.
(6) Clean the component interfaces and the adjacent area.
(7) Do an inspection of the component interfaces and the adjacent area.
(8) Make sure that the parts retained from the removed component are clean and in the correct condition.
(9) Install the APU generator (Ref. AMM TASK 24-23-51-400-001).

5. Close-up
Subtask 24-23-00-865-053-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 24-23-00-410-051-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Set control 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 24-23-00-860-054-A

C. Put the aircraft back to its initial configuration.
(1) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.03.31 23:22:21 UTC