Deactivation of the APU Generator by Installation of the Substitution Kit

TASK 24-23-00-040-001-A
Deactivation of the APU Generator by Installation 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)

NOTE: For the part number reference of the substitution kit with the APU generator removed, refer to IPC 49-11-04-05 and/or 49-11-84-40.

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	COVER - PLASTIC
No specific	1	PLACARD
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.24 and 0.22 m.daN (21.24 and 19.47 lbf.in )
No specific	Torque wrench: range to between 4.4 and 3.9 m.daN (32.45 and 28.76 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03ABA1)	Synthetic base Lubricating Oil-Turbine Engine - -
(Material No.03ABB1)	Synthetic base Lubricating Oil-Turbine Engine Low Temp. -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
9	SEAL	AIPC 49-11-04-05-150
9	SEAL	AIPC 49-11-84-40-150

E. Referenced Information

REFERENCE	DESIGNATION
TASK 24-23-51-000-001-A	Removal of the APU Generator
TASK 24-23-51-000-001-A-01	Removal 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 49-00-00-860-005-A	APU Start by External Power
TASK 49-00-00-860-005-A-01	APU Start by Batteries
TASK 49-00-00-860-006-A	APU Shutdown by External Power
TASK 49-00-00-860-006-A-01	APU Shutdown by Batteries
TASK 49-00-00-860-008-A	APU Start by External Power
TASK 49-00-00-860-008-A-01	APU Start by Batteries
TASK 49-00-00-860-009-A	APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01	APU Shutdown by Batteries (131-9(A))
TASK 49-90-00-600-004-A	Check Oil Level and Replenish (APS 3200)
TASK 49-90-00-600-007-A	Check Oil Level and Replenish (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
Components for Flight without an APU Generator Installed

3. Job Set-up
Subtask 24-23-00-860-050-A ** ON A/C NOT FOR ALL

A. Obey the MMEL requirements related to Weight Impact and Effect on Balance for Flights without APU Generator
(1) Weight Impact: -21.95 kg (-48.3915 lb).
(2) Effect on Balance: -871.35 m.daN (-77110.62 lbf.in).

Subtask 24-23-00-860-050-B ** ON A/C NOT FOR ALL

Subtask 24-23-00-860-050-C ** ON A/C NOT FOR ALL

Subtask 24-23-00-860-051-A

B. 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 24-23-00-865-050-A

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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

Subtask 24-23-00-010-050-A

D. 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) Remove the APU generator (Ref. AMM TASK 24-23-51-000-001).

4. Procedure
Subtask 24-23-00-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Substitution Kit for Flight without an APU Generator Installed

NOTE: For the Part Number reference of the substitution kit with an APU generator removed, please refer to IPC 49-11-04-05.

(1) Do an inspection of the component interfaces and the adjacent area.
(a) Remove the COVER - PLASTIC from the generator pad on the accessory drive gearbox.
(b) Clean the component interfaces and the adjacent area.
(c) Remove and keep the nuts (1) from the studs. Make sure that the nuts (1) are serviceable.
(d) Make sure that the face of the generator pad (10) and the studs are in the correct condition.
(2) Do a visual inspection of the cable support assembly (5).
(a) Make sure that the cable support assembly (5) is in the correct condition.
1 Make sure that the components of the terminal block are in the correct condition.
2 Do an inspection of the component interfaces and the adjacent area.
(3) Do a visual inspection of the seal plate (4095KM) (7).
(a) Clean the seal plate (7) with Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) and a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) .
(b) Make sure that the faces of the seal plate (7) are in the correct condition.
(4) Do a visual inspection of the assembly cover (11).
(a) Make sure that the assembly cover (11) is clean and in the correct condition.
(b) Make sure that the oil transfer channel and its inlet and outlet openings are clean and not clogged.
(c) Make sure that the drain plug (6) is installed correctly, fully tightened and safetied with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(5) Install the seal plate (4095KM) (7) on the assembly cover (11).
(a) Lubricate the new AIPC 49-11-04-05-150 SEAL (9) and the screws (8) with Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) .
(b) Put the seal plate (7) in position on the assembly cover(11).

NOTE: Make sure that the dowel pin on the assembly cover (11) engages correctly into the pilot hole on the seal plate (7).

(c) Install the screws (8).
(d) Install the seal (9) on the assembly cover (11).
(6) Install the assembly cover (11).
(a) Put the assembly cover (11) in position on the generator pad (10).

NOTE: Make sure that the dowel pin on the assembly cover (11) engages correctly into the pilot hole on the seal plate (7).

(b) Put the cable support assembly (5) in position.
(c) Install the nuts (1).
(d) TORQUE the nuts (1) to between 4.4 and 3.9 m.daN (32.45 and 28.76 lbf.ft )

.
(7) Install the generator supply cables (3) on the terminal block on the cable support assembly (5).
(a) Remove the nuts (2).
(b) Remove the tie-wraps that temporarily hold the generator supply cables (3).
(c) Remove the COVER - PLASTIC from the ring terminals of the generator supply cables (3).
(d) Attach the generator supply cables (3) to the applicable studs on the terminal block with the nuts (2).

NOTE: Refer to the marks on the terminal block and the generator supply cables (3).

(e) Attach the generator supply cables (3) with the clamp (14).
(f) Install the spacer (15), clamp (14), washer (13), screw (12), washer (16) and nut (17).
(g) TORQUE the nut (17) to between 0.24 and 0.22 m.daN (21.24 and 19.47 lbf.in )

.
(8) Connect the generator control cable to the connector on the cable support assembly (5).
(a) Remove the tie-wrap that temporarily holds the electrical connector (4).
(b) Remove the CAP-BLANKING from each electrical connector and receptacle.
(c) Make sure that all the electrical connections are clean and in the correct condition.
(d) Connect the electrical connector (4) to the cable support assembly (5).

Subtask 24-23-00-420-050-B ** ON A/C NOT FOR ALL

A. Installation of the Substitution Kit for the Flight without the APU Generator Installed

NOTE: For the part number reference of the substitution kit with the APU generator removed, refer to IPC 49-11-84-40.

(1) Do an inspection of the component interfaces and the adjacent area.
(a) Remove the COVER - PLASTIC from the generator pad (10) on the accessory drive gearbox.
(b) Clean the component interfaces and the adjacent area.
(c) Remove and keep the nuts (1) from the studs. Make sure that the nuts (1) are serviceable.
(d) Make sure that the face of the generator pad (10) and the studs are in the correct condition.
(2) Do a visual inspection of the cable support assembly (5):
(a) Make sure that the cable support assembly (5) is in the correct condition:
1 Make sure that the components of the terminal block are in the correct condition.
2 Do an inspection of the component interfaces and the adjacent area.
(3) Do a visual inspection of the seal plate (4095KM) (7):
(a) Clean the seal plate (7) with Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) and a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) .
(b) Make sure that the faces of the seal plate (7) are in the correct condition.
(4) Do a visual inspection of the assembly cover (11):
(a) Make sure that the assembly cover (11) is clean and in the correct condition.
(b) Make sure that the oil transfer channel and its inlet and outlet openings are clean and not clogged.
(c) Make sure that the drain plug (6) is installed correctly, fully tightened and safetied with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(5) Install the seal plate (4095KM) (7) on the assembly cover (11):
(a) Lubricate the new AIPC 49-11-84-40-150 SEAL (9) and the screws (8) with Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) .
(b) Put the seal plate (7) in position on the assembly cover (11).
(c) Make sure that the dowel pin on the assembly cover (11) engages correctly into the pilot hole on the seal plate (7).
(d) Install the screws (8).
(e) Tighten the screws (8).
(f) Install the seal (9) on the assembly cover (11).
(6) Install the assembly cover (11):
(a) Put the assembly cover (11) in position on the generator pad (10).
(b) Make sure that the dowel pin on the assembly cover (11) engages correctly into the pilot hole on the seal plate (7).
(c) Put the cable support assembly (5) in position.
(d) Install the nuts (1).
(e) TORQUE the nuts (1) to between 4.4 and 3.9 m.daN (32.45 and 28.76 lbf.ft )

.
(7) Install the generator supply cables (3) on the terminal block on the cable support assembly (5):
(a) Remove the nuts (2).
(b) Remove the tie wraps that temporarily hold the generator supply cables (3).
(c) Remove the COVER - PLASTIC from the ring terminals of the generator supply cables (3).
(d) Attach the generator supply cables (3) to the applicable studs on the terminal block with the nuts (2).

NOTE: Refer to the marks on the terminal block and the generator supply cables (3).

.
(8) Connect the generator control cable to the connector on the cable support assembly (5):
(a) Remove the tie wrap that temporarily holds the electrical connector (4).
(b) Remove the CAP-BLANKING from each electrical connector and receptacle.
(c) Make sure that all the electrical connections are clean and in the correct condition.
(d) Connect the electrical connector (4) to the cable support assembly (5).

Subtask 24-23-00-865-051-A

B. 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 24-23-00-790-050-A

C. Leak test

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

(1) Make sure that the work area is clean and clear of tools and other items.
(2) Start the APU:

GTCP 36-300 (Ref. AMM D/O 49-00-00-86)
or
APS 3200 (Ref. AMM TASK 49-00-00-860-005)
or
131-9(A) (Ref. AMM TASK 49-00-00-860-008).

(3) Do a check for oil leaks.
(a) Examine the joint between the assembly cover (11) and the generator pad (10) on the accessory drive gearbox for oil leaks.
(b) Examine the drain plug (6) on the assembly cover (11) for oil leaks.

NOTE: Leaks are not permitted.

(4) Stop the APU:

GTCP 36-300 (Ref. AMM D/O 49-00-00-86)
or
APS 3200 (Ref. AMM TASK 49-00-00-860-006)
or
131-9(A) (Ref. AMM TASK 49-00-00-860-009).

(5) Do a check of the oil quantity on the APU oil sight-glass. Add oil if the oil level is on or below the ADD mark on the oil sight glass:

GTCP 36-300 (Ref. AMM D/O 49-90-00-60)
or
APS 3200 (Ref. AMM TASK 49-90-00-600-004)
or
131-9(A) (Ref. AMM TASK 49-90-00-600-007).

5. Close-up
Subtask 24-23-00-410-050-A

A. 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 24-23-00-860-052-A

B. Put the aircraft back to its initial configuration.
(1) Put the PLACARD in the cockpit to tell persons that the APU generator is deactivated.
(2) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
(3) Remove the WARNING NOTICE(S).
(4) Make an entry in the logbook.

[Rev.10 from 2021] 2026.03.31 23:22:20 UTC