Removal of the Lower BiFi [PW11]

TASK 72-21-11-000-801-A
Removal of the Lower 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
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)
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
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 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 Case Module External Parts

3. Job Set-up
Subtask 72-21-11-941-051-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 72-21-11-010-052-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.
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 72-21-11-040-051-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for 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 maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 72-21-11-010-053-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the left thrust reverser cowl-doors (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

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

Subtask 72-21-11-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the Lower BiFi
(1) Remove the brackets (2), (13), (23) and (36).

Fan Case Module External Parts ** ON A/C NOT FOR ALL

(a) Remove the two bolts (3) that attach the tube (LP02) to the sleeve (1) and the bracket (2).

Fan Case Module External Parts ** ON A/C NOT FOR ALL

(b) Remove the two bolts (3) that attach the tube (LB02) to the bracket (2).

Fan Case Module External Parts ** ON A/C NOT FOR ALL

(d) Remove the bolt (3) that attaches the bracket (2) to the bracket (23).

Fan Case Module External Parts ** ON A/C NOT FOR ALL

(e) Remove the bolt (3) from the bracket (23) and the sleeve (1).
(f) Remove the four bolts (26), bushings (25) and bracket (23) from the insulation blanket (24).
(g) Remove the bolt (3) from the bracket (36) and the sleeve (37).

Fan Case Module External Parts ** ON A/C NOT FOR ALL

(h) Remove the four bolts (26) and the bushings (25) from the insulation blanket (24).
(i) Remove the bolt (39) that attaches the sleeve (38) to the sleeve (37).
(j) Remove the two bolts (3) that attaches the sleeve (1) to the sleeve (40).
(k) Remove the sleeves (1), (37), (38) and (40) from the bracket (36).
(l) Disengage the tubes (LB02), (LP02) and (LR02) from the insulation blanket (24).
(m) Remove the bracket (2).
(n) Disengage the wiring harnesses (W03) and (W04) from the insulation blanket (24).
(o) Disengage the ignition cables from the insulation blanket (24).
(p) Remove the insulation blanket (24).
(2) 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 the COVER - PROTECTION as necessary to prevent damage to the engine.

[Rev.10 from 2021] 2026.04.01 08:19:06 UTC