Removal of the Right Thrust Reverser Bullnose Seals [PW11]

TASK 78-32-72-000-803-A
Removal of the Right Thrust Reverser Bullnose Seals

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 2M (6 FT) - ADJUSTABLE
No specific	1	SCRAPER - NON METALLIC

B. Work Zones and Access Panels

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

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 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-32-00-860-802-A	Manual Extension of the Thrust-Reverser Translating Sleeves
Right Thrust Reverser Bullnose Seals

3. Job Set-up
Subtask 78-32-72-941-054-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 78-32-72-010-060-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (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

Subtask 78-32-72-040-054-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser 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) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 78-32-72-010-061-A ** ON A/C NOT FOR ALL

D. Get Access
(1) To get access, manually extend the right thrust reverser translating sleeve (Ref. AMM TASK 78-32-00-860-802).
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

4. Procedure
Subtask 78-32-72-020-054-A ** ON A/C NOT FOR ALL

A. Removal of the Right Thrust Reverser Bullnose Seals

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

(1) Remove the upper bullnose seal (1).
(a) Cut the bond between the upper bullnose seal (1) and the seal retainers.
(b) Remove the upper bullnose seal (1) from the upper seal cap, the adjacent standard bullnose seal (2) and the applicable seal retainer.
(c) Remove the remaining sealant from the seal retainers with a SCRAPER - NON METALLIC.
(2) Remove the lower bullnose seal (3).
(a) Cut the bond between the lower bullnose seal (3) and the seal retainer.
(b) Remove the lower bullnose seal (3) from the lower seal cap, the adjacent standard bullnose seal (2) and the applicable seal retainer.
(c) Remove the remaining sealant from the seal retainer with a SCRAPER - NON METALLIC.
(3) Remove the three standard bullnose seals (2).
(a) Cut the bond between the three standard bullnose seals (2) and the seal retainers.
(b) Remove the standard thrust reverser bullnose seals (2) from the applicable seal retainers.
(c) Remove the remaining sealant from the seal retainers with a SCRAPER - NON METALLIC.

[Rev.10 from 2021] 2026.04.01 03:33:47 UTC