Removal of the Blocker Doors Actuation-Levers [CFMB]

TASK 78-31-17-000-003-A
Removal of the Blocker Doors Actuation-Levers

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

ZONE: 400
FIN: 4103KS1 ** ON A/C NOT FOR ALL
FIN: 4103KS2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-31-17-000-001-A	Removal of the Blocker Door Deploy-Switch
TASK 78-32-41-000-001-A	Removal of the Lower Blocker Door
TASK 78-32-41-000-002-A	Removal of the Upper Blocker Door
Blocker Door Switch, Actuation Levers and Beam Electrical Harness

3. Job Set-up
Subtask 78-31-17-941-054-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Put the WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine shutdown occurred five minutes or more before you do this procedure.
(3) On overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 78-31-17-010-053-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position on the right side of the engine.

Subtask 78-31-17-040-052-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 78-31-17-010-054-A ** ON A/C NOT FOR ALL

D. Remove the blocker door deploy switch (Ref. AMM TASK 78-31-17-000-001).

4. Procedure
Subtask 78-31-17-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the Blocker Doors Actuation-Levers
(1) Remove the screw (60) and the nut (50) that attach the trigger (90).
(2) Remove the trigger (90).
(3) Remove the lower or upper blocker door (Ref. AMM TASK 78-32-41-000-001) or (Ref. AMM TASK 78-32-41-000-002).
(4) Remove the bolt (20) and the lock washer (10) that attach the upper outer lever (30) and the upper inner lever (40).
(a) Discard the lock washer (10).
(5) Remove the bolt (20) and the lock washer (10) that attach the lower outer lever (160) and the lower inner lever (170).
(a) Discard the lock washer (10).
(6) Remove the upper inner lever (40) and the upper outer lever (30).
(7) Remove the lower inner lever (170) and the lower outer lever (160).

[Rev.10 from 2021] 2026.04.01 03:24:08 UTC