Removal of the APU Access Door and the related Door Mechanism

TASK 52-41-22-000-001-A
Removal of the APU Access Door and the related Door Mechanism

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.

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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 49-16-45-000-002-A	Removal of the Air Intake Diffuser and Elbow (APS 3200)
TASK 49-16-45-000-003-A	Removal of the Air Intake Diffuser and Elbow (131-9(A))
TASK 52-41-00-010-001-A	Open the APU Doors for Access
APU Access Door 316AR
Door Mechanism of APU Access Door 316AR ** ON A/C NOT FOR ALL
Door Mechanism of APU Access Door 316AR ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 52-41-22-010-050-A

A. Get Access
(1) Open the APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-010-001).
(2) Put the ACCESS PLATFORM 4M (13 FT) in position below the APU compartment.
(3) Put the WARNING NOTICE(S) in the flight compartment to tell persons not to start the APU.

Subtask 52-41-22-865-050-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

4. Procedure
Subtask 52-41-22-020-052-B

WARNING: MAKE SURE THAT THE PIP-PIN STAYS IN POSITION DURING THE REMOVAL OF THE APU ACCESS DOOR.

A. Removal of the APU Access Door 316AR

APU Access Door 316AR

(1) Move the APU access door (4) into its removal position as follows:
(a) Operate the control handle (5) so that the APU access door (4) moves into its vertical position.
(b) Remove the pip-pin (6) from its stowage hole and install it into the rigging hole to safety the door linkage mechanism.

NOTE: Make sure that the pip-pin (6) is correctly engaged. The pip-pin (6) holds the spring assembly of the door linkage mechanism which has a load of 260 daN (584.5031 lbf) in its extended position.

(2) If installed, remove the air intake diffuser and the elbow:

For APU GTCP 36-300 (Ref. AMM D/O 49-16-45-00)
For APU APS 3200 (Ref. AMM TASK 49-16-45-000-002)
For APU 131-9(A) (Ref. AMM TASK 49-16-45-000-003).

(3) Remove the screws (12), the washers (11) and the two bonding straps (10) from the APU access door (4).
(4) Disconnect the door linkage mechanism from the APU access door (4) as follows:
(a) Remove and discard the cotter pin (17) from the nut (18).
(b) Remove the nut (18), the washers (19) and the bolt (2) from the door hinge fitting (3).
(c) Disengage the eye-end (1) from the door hinge fitting (3).
(5) Hold the APU access door (4) and remove the three quick-release pins (9) from the mounting brackets (8).
(6) Remove the APU access door (4) from the opening of the fuselage.

Subtask 52-41-22-020-053-A ** ON A/C NOT FOR ALL

B. Removal of the Door Linkage Mechanism

Door Mechanism of APU Access Door 316AR ** ON A/C NOT FOR ALL

(1) Release the tension of the spring assembly (26) as follows:

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) Cut and remove the lockwire from the extension screw part (43) and the screw-bolt (27).
(b) Turn the screw-bolt (27) until the tension of the spring assembly (26) fully decreased.
(2) Remove the spring assembly (26) from the control handle (32) as follows:
(a) Remove and discard the cotter pin (28) from the nut (29).
(b) Remove the nut (29), the washer (30), the bolt (33) and the bushes (31).
(c) Disassemble the connection lever (44) with the washers (40) and the control handle (32) from the shift lever (35).
(3) Pull the pip-pin (34) and remove the control handle (32) from the shift lever (35)
(4) Remove the shift lever (35) from the fuselage fitting as follows:
(a) Remove and discard the cotter pin (38) from the nut (37).
(b) Remove the nut (37), the washers (36) and the bolt (41).
(c) Pull the pip-pin (39) and remove the shift lever (35) from the fuselage fitting.
(5) Install the pip-pin (39) in the stowage hole of the fuselage fitting.
(6) Remove the spring assembly (26) from the structure fitting as follows:
(a) Remove and discard the cotter pin (24) from the nut (25).
(b) Remove the nut (25), the washer (23) and the bolt (21).
(c) Remove the fork fitting (42) and the washers (22) from the structure fitting.

Subtask 52-41-22-020-053-B ** ON A/C NOT FOR ALL

B. Removal of the Door Linkage Mechanism

Door Mechanism of APU Access Door 316AR ** ON A/C NOT FOR ALL

(1) Release the tension of the spring assembly (26) as follows:

(a) Cut and remove the lockwire from the extension screw part (43) and the screw-bolt (27).
(b) Turn the screw-bolt (27) until the tension of the spring assembly (26) fully decreased.
(2) Remove the spring assembly (26) from the control handle (32) as follows:
(a) Remove and discard the cotter pin (28) from the nut (29).
(b) Remove the nut (29), the washer (30), the bolt (33) and the bushes (31).
(c) Disassemble the connection lever (44) with the washers (40) and the control handle (32) from the shift lever (35).
(3) Pull the pip-pin (34) and remove the control handle (32) from the shift lever (35)
(4) Remove the shift lever (35) from the fuselage fitting as follows:
(a) Remove and discard the cotter pin (38) from the nut (37).
(b) Remove the nut (37), the washers (36) and (45) and the bolt (41).
(c) Pull the pip-pin (39) and remove the shift lever (35) from the fuselage fitting.
(5) Install the pip-pin (39) in the stowage hole of the fuselage fitting.
(6) Remove the spring assembly (26) from the structure fitting as follows:
(a) Remove and discard the cotter pin (24) from the nut (25).
(b) Remove the nut (25), the washer (23) and the bolt (21).
(c) Remove the fork fitting (42) and the washers (22) from the structure fitting.

[Rev.10 from 2021] 2026.04.01 01:45:06 UTC