Removal of the Hydraulic Line Upper, Double and Lower Brackets [CFMB]

TASK 78-31-49-000-004-B
Removal of the Hydraulic Line Upper, Double and Lower Brackets

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	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
Upper, Double, and Lower Brackets

3. Job Set-up
Subtask 78-31-49-941-094-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 78-31-49-010-131-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 a ACCESS PLATFORM 1M(3 FT) in position.

Subtask 78-31-49-040-119-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 78-31-49-020-091-A ** ON A/C NOT FOR ALL

A. Removal of the Hydraulic Line Upper, Double and Lower Brackets:
(1) Removal of the Hydraulic Line Upper Bracket
(a) Remove the nuts and the bolts that attach the flange and the upper half clamp to the upper bracket.
(b) On the right forward frame, remove the nut, the bolt and the clamp that attach the electrical harness to the upper bracket.
(c) Remove the nuts and the bolts that attach the upper bracket to the forward frame.
(d) Remove the upper bracket from the forward frame.
(2) Removal of the Hydraulic Line Double Bracket
(a) Remove the nuts and the bolts that attach the double flange and the upper half clamps to the double bracket.
(b) Remove the nut, the bolt and the clamp from the double bracket.
(c) Remove the nuts and the bolts that attach the double bracket to the forward frame.
(d) Remove the double bracket from the forward frame.
(3) Removal of the Hydraulic Line Lower Bracket
(a) Remove the nut and the bolt that attach the washer and the upper half clamp to the lower bracket.
(b) Remove the nuts and the bolts that attach the lower bracket to the forward frame.
(c) Remove the lower bracket from the forward frame.

[Rev.10 from 2021] 2026.04.01 03:24:52 UTC