Removal of the APU Mount Brackets (131-9(A))

TASK 49-12-54-000-003-A
Removal of the APU Mount Brackets (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: LOCK THE MECHANISM OF THE ACCESS DOOR 316AR WITH THE PIP PIN WHEN YOU OPEN THE ACCESS DOOR. THIS WILL PREVENT INJURY.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

CAUTION: DO NOT REMOVE MORE THAN ONE APU MOUNT AT A TIME WHEN THE APU IS INSTALLED. THE APU HOIST AND THE REMAINING TWO MOUNTS MUST SUPPORT THE APU WHEN YOU REMOVE AN APU MOUNT.

FIN: 4065KM ** ON A/C NOT FOR ALL
FIN: 4075KM ** ON A/C NOT FOR ALL
FIN: 4085KM ** 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 4M (13 FT)-ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
98A49107504001	1	PROTECTOR-THREADS,APU MOUNTING BOLTS
A1-91-265	1	HOIST-MINILIFT

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08ABC1)	Aqueous Cleaner-Aircraft Exterior Pressure Spraying -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 49-00-00-480-003-A	Installation of the APU Hoist Tool
TASK 52-41-00-010-001-A	Open the APU Doors for Access
TASK 52-41-21-000-001-A	Removal of APU Access Door 315AL
TASK 52-41-22-000-001-A	Removal of the APU Access Door and the related Door Mechanism
NTM 511014
FWD-Left and FWD-Right APU Mount Brackets ** ON A/C NOT FOR ALL
FWD-Left and FWD-Right APU Mount Brackets ** ON A/C NOT FOR ALL
Rear APU Mount Bracket

3. Job Set-up
Subtask 49-12-54-860-056-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 the warning notices on panel 25VU 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 49-12-54-865-056-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 49-12-54-010-052-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE below the access doors 315AL and 316AR.
(2) Open or remove the APU access doors (Ref. AMM TASK 52-41-00-010-001) 315AL 316AR (Ref. AMM TASK 52-41-21-000-001) (Ref. AMM TASK 52-41-22-000-001).
(3) Set the LIGHT SW 11LJ to the ON position.

4. Procedure
Subtask 49-12-54-480-052-A ** ON A/C NOT FOR ALL

A. Installation of the HOIST- MINILIFT

WARNING: OBEY THE HOISTING SAFETY PROCEDURES. MAKE SURE THAT THE HOIST IS ASSEMBLED AND ATTACHED CORRECTLY BEFORE YOU PUT A LOAD ON IT. OBEY THE MANUFACTURER'S INSTRUCTIONS WHEN YOU USE THE HOIST. IF THE HOIST IS IN AN INCORRECT CONDITION THE LOAD CAN MOVE ACCIDENTALLY AND KILL PERSONS OR CAUSE INJURY.

WARNING: DO NOT TURN THE HOIST HANDLE MORE THAN 90 DEGREES WHEN THE APU MOUNT BRACKETS ARE TIGHTLY ENGAGED ON THE VIBRATION ISOLATORS. IF YOU TURN THE HOIST HANDLE MORE THAN 90 DEGREES, YOU CAN CAUSE DAMAGE TO THE APU AND THE APU MOUNTS. THEN THE APU CAN FALL AND KILL PERSONS OR CAUSE THEM INJURY.

(1) Install the A1-91-265 HOIST-MINILIFT (Ref. AMM TASK 49-00-00-480-003)

Subtask 49-12-54-020-052-A ** ON A/C NOT FOR ALL

B. Removal of the APU Mount Brackets
(1) Slowly wind the handle on the APU hoist until the APU hoist-cable is in tension.
(2) Remove the FWD left and FWD-right APU mount-brackets.

FWD-Left and FWD-Right APU Mount Brackets ** ON A/C NOT FOR ALL

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(a) Removal of the Lockwire:

Remove and discard the lockwire from the bolts (10) of the FWD APU mount-bracket (17).

(b) Remove the nut (11) and the washer (12) from the setscrew (15) and disconnect the bonding jumper (13).
(c) Temporarily install the nut (11) adjacent to the nut (14) on the setscrew (15). Use the nut (11) as a locknut and remove the setscrew (15) from the FWD APU mount-bracket (17).
(d) Remove the FWD APU mount-nut (16).
(e) Install the 98A49107504001 PROTECTOR-THREADS,APU MOUNTING BOLTS on the vibration isolators.
(f) Remove the bolts (10) from the FWD APU mount-bracket (17).
(g) Carefully pull the FWD APU mount-bracket (17) out and down to disconnect it from the APU and the vibration isolator.

NOTE: The FWD APU mount-bracket has a spigot which engages in the APU. This spigot is 9.0906 mm (0.3579 in.) long.

(h) Clean the FWD APU mount-bracket and the setscrew with Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) .
(i) Do a visual inspection of the FWD APU mount-bracket for damage:
1 Make sure that the bolt holes of the bracket are not elongated.
2 Make sure that the surface finish of the tapered hole has not scratches, scores or burrs.
3 Make sure that the thread in the bracket, for the setscrew is not damaged.
4 Make sure that the flange is not bent.
5 Make sure that there are no cracks in the APU mount bracket. If you think there is a crack, do a dye-penetrant inspection.
(j) Do a visual inspection of the setscrew. Replace the setscrew and the nuts if necessary.
(3) Remove the rear APU mount-bracket.

Rear APU Mount Bracket ** ON A/C NOT FOR ALL

(a) Disconnect the rear vibration isolator (23) from the tie-rods (22) and (28).
1 Remove the cotter pin (18), the nut (19), and the washer (20) from the bolt (21).
2 Remove the bolt (21) and disconnect the rear right tie-rod (22) from the rear vibration isolator (23).
3 Remove the cotter pins (24), the nuts (25), and the washers (26) from the bolts (27).
4 Remove the bolts (27) and disconnect the rear left tie-rod (28) from the rear vibration isolator (23).
(b) Remove the rear APU mount-nut (29) and remove the rear vibration isolator (23) from the rear APU mount-bracket (31).
(c) Install the 98A49107504001 PROTECTOR-THREADS,APU MOUNTING BOLTS on the rear APU mount.

(d) Removal of the Lockwire:

Remove and discard the lockwire from the bolts (30) of the rear APU mount bracket (31).

(e) Remove the bolts (30) from the rear APU mount bracket (31).
(f) Carefully pull the rear APU mount-bracket (31) up to remove it from the APU.

NOTE: The rear APU mount-bracket has a spigot which engages in the APU. This spigot is 5.0 mm (0.1969 in.) long.

(g) Clean the rear APU mount-bracket (31) with Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) .
(h) Do a visual inspection of the rear APU mount-bracket (31) for damage:
1 Make sure that the bolt holes of the bracket are not elongated.
2 Make sure that the surface finish of the tapered shaft has not scratches, scores or burrs.
3 Make sure that there are no cracks in the rear APU mount-bracket (31). If you think there is a crack, do a liquid-penetrant NTM 511014 inspection.

[Rev.10 from 2021] 2026.04.01 12:42:21 UTC