Removal of the Fan Exit Fairing - Upper Bifi [PW11]

TASK 72-21-04-000-801-A
Removal of the Fan Exit Fairing - Upper Bifi

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

ZONE: 400

1. Reason for the Job
Use this procedure to remove the fan exit fairing assembly (upper bifi).
For more information about the fan case assembly, refer to (72-21-00-00U).
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	AR	COVER - PROTECTION

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

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 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
Fan Exit Fairing

3. Job Set-up
Subtask 72-21-04-941-050-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 72-21-04-010-050-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 72-21-04-040-050-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Maintenance

WARNING: MAKE SURE THAT YOU DO THE DEACTIVATION OF THE THRUST REVERSER BEFORE YOU DO MAINTENANCE WORK ON OR AROUND THE THRUST REVERSER. IF YOU DO NOT DO THIS PROCEDURE, THERE IS A RISK OF UNWANTED OPERATION AND THUS OF INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 72-21-04-010-051-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

4. Procedure

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

Subtask 72-21-04-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Fan Exit Fairing - Upper Bifi
(1) Find the fan exit fairing (upper) (1) located approximately at the 12 o'clock position attached to the fan case.
(2) Remove the two ferrules (4) and safety cables (left and right) (2) from the fan exit fairing (upper) (1), fan exit fairing (right) (3), and fan exit fairing (left) (5).
(3) Remove the fan exit fairing (upper) (1), fan exit fairing (right) (3), and fan exit fairing (left) (5) from the fan case and Compressor Intermediate Case (CIC) firewall as follows:
(a) Remove the two bolts (15) from the fan exit fairing (upper) (1), fan exit fairing (right) (3), and fan exit fairing (left) (5).
(b) Loosen the two bolts (19).
(c) Move the fan exit fairing (right) (3) and fan exit fairing (left) (5) vertically until the two bolts (19) disengage from the two holes.
(d) Remove the fan exit fairing (right) (3) and fan exit fairing (left) (5) from the fan exit fairing (upper) (1).
(e) Remove the six screws (18) from the fan exit fairing (upper) (1) and CIC firewall.
(f) Move the fan exit fairing (upper) (1) vertically and remove it from the fan case.
(g) Remove the four bolts (16) and two brackets (17) from the CIC firewall.
(4) Installation of the protection covers

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install COVER - PROTECTION as necessary to prevent damage to the engine.

[Rev.10 from 2021] 2026.04.01 12:51:10 UTC