Removal of the Blocker Door Deploy-Switch [CFMB]

TASK 78-31-17-000-001-A
Removal of the Blocker Door Deploy-Switch

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	PLIERS - NOSE, SOFT, LONG
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
Blocker Door Switch, Actuation Levers and Beam Electrical Harness

3. Job Set-up
Subtask 78-31-17-941-050-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 78-31-17-010-050-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 in the right side of engine.

Subtask 78-31-17-040-050-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 78-31-17-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Blocker Door Deploy-Switch
(1) Remove the screws (80) that attach the deploy-switch access door (70).
(2) Remove the deploy-switch access door (70).
(3) Remove the four bolts (100) that attach the blocker door deploy-switch (110).
(4) Loosen the coupling nuts of the deploy switch connectors (120) with the PLIERS - NOSE, SOFT, LONG.
(5) Disconnect the beam electrical harness (130) from the blocker door deploy-switch (110).
(6) Remove the blocker door deploy-switch (110).

[Rev.10 from 2021] 2026.04.02 07:42:19 UTC