Removal of the Interface Bracket, HCU Bracket and Hydraulic Line Middle Bracket [CFMI]

TASK 78-31-49-000-021-A
Removal of the Interface Bracket, HCU Bracket and Hydraulic Line Middle Bracket

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.

CAUTION: MAKE SURE THERE IS NO UNWANTED MATERIAL IN THE PORTS AND ORIFICES OR DAMAGE CAN OCCUR.

CAUTION: YOU MUST INSTALL HYDRAULIC TUBES WITH HYDRAULIC FLUID AS LUBRICANT.

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	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)
HIX3005	1	SAFETY SLEEVE - PIVOTING DOOR ACTUATOR

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-30-00-680-040-A	Drain the Pipes of the Actuator System
TASK 78-30-00-680-041-A	Drain the Pipes of the Latch System
TASK 78-32-41-480-040-A	Installation of the Safety Sleeve on Blocker Door Actuator
TASK 78-32-41-860-040-A	Manual Deployment of the Blocker Door
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
Forward Frame of the Half Door
Forward Frame of the Half Door
Hydraulic Line Brackets
Hydraulic Line Brackets
HCU Bracket
Supply Hoses and Pipes - Actuator Rod and Head
Supply Hoses and Pipes - Actuator Rod and Head

3. Job Set-up
Subtask 78-31-49-941-068-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 78-31-49-010-074-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.

Subtask 78-31-49-040-057-A ** ON A/C NOT FOR ALL

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

Subtask 78-31-49-864-050-A ** ON A/C NOT FOR ALL

D. Drain the thrust reverser hydraulic system (Ref. AMM TASK 78-30-00-680-040) and (Ref. AMM TASK 78-30-00-680-041)

Subtask 78-31-49-010-075-A ** ON A/C NOT FOR ALL

E. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

4. Procedure
Subtask 78-31-49-020-066-A ** ON A/C NOT FOR ALL

A. Remove the Interface Bracket, HCU Bracket and Hydraulic Line Middle Bracket.
(1) Remove the HCU bracket as follows:

HCU Bracket ** ON A/C NOT FOR ALL

(2) Put a CONTAINER 5 L (1.32 USGAL).
(3) Remove the clamp, bolt and nut which attach the electrical harness on the bracket.
(4) Disconnect the interface hydraulic hoses from the HCU bracket.
(5) Disconnect the actuator rod and head supply pipe and the lower blocker door supply pipe from the bracket.
(6) Remove the bolts which attach the bracket on the HCU.
(7) Remove the HCU bracket.
(8) Remove the interface bracket.
(a) Remove the nut, bolt and the clamp which attach the electrical harness on the bracket
(b) Disconnect the interface hydraulic hose from the interface bracket.
(c) Disconnect the rod and head supply pipe, the left latch return pipe and the upper left latch supply pipe from the interface bracket
(d) Remove the bolt which attach the bracket on the forward frame.
(e) Remove the interface bracket.
(9) Remove the hydraulic line middle bracket
(a) Manually bring the blocker door to deploy position (Ref. AMM TASK 78-32-41-860-040) .
(b) Install the HIX3005 SAFETY SLEEVE - PIVOTING DOOR ACTUATOR on the blocker door actuator (Ref. AMM TASK 78-32-41-480-040).
(c) Disconnect the rod and head supply pipes from the bracket.

Supply Hoses and Pipes - Actuator Rod and Head ** ON A/C NOT FOR ALL

(d) Remove bolts, washers, half clamps and heat shield from the bracket.

Supply Hoses and Pipes - Actuator Rod and Head ** ON A/C NOT FOR ALL

(e) Disconnect the rod and head supply junction pipe from the middle bracket.
(f) Remove the bolts and nuts which attach the bracket on the forward frame.
(g) Carefully move the pipes aside and remove the middle bracket.
(10) Remove the container.
(11) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.02 07:42:01 UTC