Removal of the Blocker Door Hydraulic Actuator Clevis [CFMB]

TASK 78-31-41-000-803-A
Removal of the Blocker Door Hydraulic Actuator Clevis

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

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	WARNING NOTICE(S)
HIX3002	1	HOLD,OPEN ROD-PIVOTING DOOR

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 78-32-41-860-001-A	Manual Deployment of the Blocker Door
Hold-Open Rod, Blocker Door (HIX3002)
Hydraulic Actuator Clevis

3. Job Set-up
Subtask 78-31-41-941-072-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) On the 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 a WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1(2).

Subtask 78-31-41-010-085-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 78-31-41-040-072-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser

WARNING: MAKE THE THRUST REVERSER UNSERVICEABLE. IF THE THRUST REVERSER IS NOT MADE UNSERVICEABLE, IT CAN OPERATE ACCIDENTALLY BECAUSE THE BLOCKER DOOR HOLD-OPEN ROD DOES NOT RESIST THE ACTUATOR HYDRAULIC PRESSURE. THIS CAN CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT.

(1) Make sure that the thrust reverser is unserviceable (Ref. AMM TASK 78-30-00-481-041).

4. Procedure
Subtask 78-31-41-010-086-A ** ON A/C NOT FOR ALL

A. Removal for Access
(1) For the lower blocker door, remove the clevis access door as follows:
(a) Remove the three screws.
(b) Remove the access door.
(2) For the upper blocker door, remove the clevis access door as follows:
(a) Remove the eight screws.
(b) Remove the access door.

Subtask 78-31-41-020-065-A ** ON A/C NOT FOR ALL

B. Removal of the Hydraulic Actuator Clevis
(1) Remove the hydraulic actuator clevis from the blocker door.
(a) Remove the four bolts and the washers that attach the clevis to the blocker door.

Subtask 78-31-41-860-075-A ** ON A/C NOT FOR ALL

C. Manual Deployment of the Blocker Door

CAUTION: YOU MUST HOLD THE END OF THE HYDRAULIC ACTUATOR WHEN YOU REMOVE/INSTALL IT. THIS MAKES SURE YOU DO NOT DAMAGE THE RAMP FAIRING.

(1) Deploy the blocker door manually (Ref. AMM TASK 78-32-41-860-001).

Subtask 78-31-41-480-062-A ** ON A/C NOT FOR ALL

D. Installation of the Hold-Open Rod

(1) Install the HIX3002 HOLD,OPEN ROD-PIVOTING DOOR.
(a) Remove the screw and the lock-out fairing on the blocker door.
(b) Attach the hold-open rod to the lock-out fitting of the forward frame with the knurled screw.
(c) Attach the other end of the hold-open rod to the lock-out fitting of the blocker door with the knurled screw.

Subtask 78-31-41-020-066-A ** ON A/C NOT FOR ALL

E. Removal of the Blocker Door Hydraulic Actuator Clevis
(1) Remove the clevis from the hydraulic actuator.
(a) Remove and discard the cotter pin.
(b) Remove the castellated nut, the washer and the pin.
(c) Remove the clevis.

[Rev.10 from 2021] 2026.04.01 03:24:23 UTC