Installation of the Pressure Relief Door Latch [PW11]

TASK 78-32-46-400-803-A
Installation of the Pressure Relief Door Latch

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

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 1M (3 FT)-ADJUSTABLE
No specific	Torque wrench: range to between 35 and 30 lbf.in (0.40 and 0.34 m.daN )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Pressure Relief Door Latch

3. Job Set-up
Subtask 78-32-46-860-055-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 78-32-46-010-076-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR
(2) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position.

Subtask 78-32-46-040-062-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser System for Ground Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Make sure that you did the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 78-32-46-010-077-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Make sure that the left thrust reverser cowl-door is open (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL

4. Procedure
Subtask 78-32-46-420-056-A ** ON A/C NOT FOR ALL

A. Installation of the Pressure Relief Door Latch

CAUTION: DO NOT OPEN THE PRESSURE RELIEF DOOR MORE THAN 23 DEGREES. IF YOU OPEN THE PRESSURE RELIEF DOOR MORE THAN 23 DEGREES, THE SHOCK BUSHINGS CAN HIT THE PRESSURE-RELIEF DOOR CLEVIS AND BECOME DAMAGED.

(1) Install the pressure relief door latch (4).
(a) Attach the pressure relief door latch (4) and forward latch heat-shield (5) to the pressure relief door. Use the five pins (3), one washer (2) and five nuts (1).
(b) TORQUE the five nuts (1) to between 35 and 30 lbf.in (0.40 and 0.34 m.daN )

.
(c) Make sure that the thickness of the striker plate (9) and striker pad (10) is between 0.006 in. (0.152 mm) and 0.010 in. (0.254 mm) thicker than the distance between the pressure relief door latch (4) and the pressure relief door frame. If necessary, adjust the thickness of the striker plate (9) and striker pad (10) as follows:
1 Remove the two nuts (6), two washers (7) and two pins (11) that attach the aft latch heat-shield (8), striker plate (9) and striker pad (10) to the pressure relief door frame.
2 Adjust the thickness of the striker pad (10).

NOTE: If the striker pad (10) is too thin, use a new striker pad (10).

3 Install the aft latch heat-shield (8), striker plate (9) and striker pad (10) back on the pressure relief door frame. Use the two pins (11), two washers (7) and two nuts (6).
4 TORQUE the two nuts (6) to between 35 and 30 lbf.in (0.40 and 0.34 m.daN )

.
(d) Push the pressure relief door retention spring down and close the pressure relief door.

5. Close-up
Subtask 78-32-46-410-068-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the left thrust reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL

Subtask 78-32-46-440-058-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 78-32-46-410-069-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:33:31 UTC