Removal of the Lower Supply Pipe of the Left Latch [CFMB]

TASK 78-31-49-000-043-A
Removal of the Lower Supply Pipe of the Left Latch

WARNING: WEAR A FACE SHIELD WHICH IS RESISTANT TO HIGH PRESSURE JETS WHEN YOU WORK ON PRESSURIZED SYSTEMS.

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** 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	CONTAINER 5 L (1.32 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
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
Lower Supply Pipe of the Left Latch
Thermal Blankets on the Blocker Door Latches

3. Job Set-up
Subtask 78-31-49-941-078-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) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 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) to tell persons not to energize the FADEC 1(2).

Subtask 78-31-49-010-112-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open 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.

Subtask 78-31-49-040-103-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 78-31-49-020-076-A ** ON A/C NOT FOR ALL

A. Removal of the Lower Supply Pipe of the Left Latch
(1) Turn the Dzus fastener on the thermal blanket to loosen it and remove the blanket from the blocker door latch.

Thermal Blankets on the Blocker Door Latches ** ON A/C NOT FOR ALL

(2) Put a CONTAINER 5 L (1.32 USGAL) under the lower latch of the blocker door.
(3) Disconnect the lower supply pipe from the lower latch and let the hydraulic fluid drain into the container.
(4) Remove the bolt and the washer that attach the upper half clamp to the middle hydraulic line bracket.
(5) Remove the nut and the bolts that attach the double flange and the upper half clamps to the double hydraulic line bracket.
(6) Remove the bolt and the washer that attach the upper half clamp to the lower hydraulic line bracket.
(7) Disconnect the lower supply pipe from the upper latch.
(8) Remove the lower supply pipe from the forward frame.
(9) Put COVER - PROTECTION on the pipe ends.

[Rev.10 from 2021] 2026.04.01 03:24:49 UTC