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

TASK 78-31-49-400-021-A
Installation 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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 30 and 27 lbf.in (0.34 and 0.31 m.daN )
No specific	Torque wrench: range to between 40 and 30 lbf.in (0.45 and 0.34 m.daN )
No specific	Torque wrench: range to between 70 and 61 lbf.in (0.79 and 0.69 m.daN )
No specific	Torque wrench: range to between 80 and 70 lbf.in (0.90 and 0.79 m.daN )
No specific	Torque wrench: range to between 125 and 113 lbf.in (1.41 and 1.28 m.daN )
No specific	Torque wrench: range to between 260 and 235 lbf.in (2.94 and 2.66 m.daN )
No specific	Torque wrench: range to between 300 and 260 lbf.in (3.39 and 2.94 m.daN )
No specific	Torque wrench: range to between 300 and 270 lbf.in (3.39 and 3.05 m.daN )
No specific	Torque wrench: range to between 410 and 370 lbf.in (4.63 and 4.18 m.daN )
No specific	Torque wrench: range to between 500 and 450 lbf.in (5.65 and 5.09 m.daN )
No specific	Torque wrench: range to between 560 and 540 lbf.in (6.33 and 6.10 m.daN )
No specific	Torque wrench: range to between 700 and 610 lbf.in (7.91 and 6.89 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2245)	finish paint EA4 blue 5991
(Material No.CP2318)	blindexite RT 342-2

C. 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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-30-00-710-040-A	Thrust Reverser Hydraulic System Bleed Procedure
TASK 78-32-41-080-040-A	Removal of the Safety Sleeve from Blocker Door Actuator
TASK 78-32-41-860-041-A	Manual Stowing of the Blocker Door
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
Forward Frame of the Half Door
Forward Frame of the Half Door
Supply Hoses and Pipes - Actuator Rod and Head
Supply Hoses and Pipes - Actuator Rod and Head
HCU Bracket
Hydraulic Line Brackets
Hydraulic Line Brackets

3. Job Set-up
Subtask 78-31-49-860-075-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 78-31-49-010-082-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open: (Ref. AMM TASK 78-36-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 78-31-49-040-059-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 78-31-49-420-066-A ** ON A/C NOT FOR ALL

A. Install the HCU Bracket and Hydraulic Line Middle Bracket.
(1) Remove blanking plugs from disconnect line ends.

NOTE: You should apply a witness line of finish paint EA4 blue 5991 (Material No.CP2245) .

(2) Install the HCU bracket

HCU Bracket ** ON A/C NOT FOR ALL

(a) Install the bracket on the hydrualic control unit and attach it with bolts.
(b) TORQUE the nut to between 70 and 61 lbf.in (0.79 and 0.69 m.daN )

.
(c) Install the actuator rod supply pipe on bracket.
(d) TORQUE the nut to between 410 and 370 lbf.in (4.63 and 4.18 m.daN )

(e) Install the actuator head supply pipe.
(f) TORQUE the nut to between 700 and 610 lbf.in (7.91 and 6.89 m.daN )

(g) Install the lower blocker door supply pipe.
(h) TORQUE the nut to between 300 and 260 lbf.in (3.39 and 2.94 m.daN )

.
(i) Connect the interface hydraulic hoses on the bracket.
(j) TORQUE nut of the interface hydraulic hose connected to the supply pipe of the lower blocker door to between 125 and 113 lbf.in (1.41 and 1.28 m.daN )

.
(k) TORQUE nut of the interface hydraulic hose connected to the actuator head supply pipe to between 560 and 540 lbf.in (6.33 and 6.10 m.daN )

.
(l) TORQUE nut of the interface hydraulic hose connected to the actuator rod supply pipe to between 300 and 270 lbf.in (3.39 and 3.05 m.daN )

.
(m) Apply a layer:

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1 Apply a layer of blindexite RT 342-2 (Material No.CP2318) on the bracket surfaces in contact with the forward frame.
(3) Install the hydraulic line middle bracket as follows:

Hydraulic Line Brackets ** ON A/C NOT FOR ALL

(a) Install the bracket on the forward frame and attach it with bolts and nuts.
(b) TORQUE the nuts to between 70 and 61 lbf.in (0.79 and 0.69 m.daN )

.
(c) Install the rod supply junction pipe
(d) TORQUE the nut to between 410 and 370 lbf.in (4.63 and 4.18 m.daN )

.
(e) Install the head supply junction pipe.
(f) TORQUE the nut to between 700 and 610 lbf.in (7.91 and 6.89 m.daN )

(g) Connect the rod supply pipe on the middle bracket.
(h) TORQUE the nut to between 260 and 235 lbf.in (2.94 and 2.66 m.daN )

:
(i) Connect the head supply pipe on the middle bracket.
(j) TORQUE the nut to between 500 and 450 lbf.in (5.65 and 5.09 m.daN )

.
(k) Install the heat shield, half clamps, washer and bolt on bracket.
(l) TORQUE the bolt to between 30 and 27 lbf.in (0.34 and 0.31 m.daN )

Subtask 78-31-49-080-052-A ** ON A/C NOT FOR ALL

B. Remove the safety sleeve (HIX 3005) without making thrust reverser operational (Ref. AMM TASK 78-32-41-080-040).

Subtask 78-31-49-420-067-A ** ON A/C NOT FOR ALL

C. Install the interface bracket.
(1) Install the interface bracket on the forward frame and attach it with bolts
(2) TORQUE the bolts to between 80 and 70 lbf.in (0.90 and 0.79 m.daN )

(3) Install the rod supply pipe on bracket.
(4) TORQUE the nut to between 260 and 235 lbf.in (2.94 and 2.66 m.daN )

.
(5) Install the head supply pipe.
(6) TORQUE the nut to between 500 and 450 lbf.in (5.65 and 5.09 m.daN )

.
(7) Install the upper latch supply pipe and the latch return pipe on the bracket.
(8) TORQUE the nut to between 300 and 260 lbf.in (3.39 and 2.94 m.daN )

.
(9) Install the clamp with electrical harness and attach it with bolt and nut.
(10) TORQUE the nut to between 40 and 30 lbf.in (0.45 and 0.34 m.daN )

5. Close-up
Subtask 78-31-49-410-074-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser doors: (Ref. AMM TASK 78-36-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 78-31-49-860-054-A ** ON A/C NOT FOR ALL

B. Bring the Blocker Door

CAUTION: BLOCKER DOOR LATCH MUST BE OPENED WHEN YOU CLOSE THE BLOCKER DOOR OR DAMAGE CAN OCCUR.

(1) Manually bring blocker doors to stows position (Ref. AMM TASK 78-32-41-860-041).

Subtask 78-31-49-440-057-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041)

Subtask 78-31-49-410-075-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040).
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 78-31-49-710-061-A ** ON A/C NOT FOR ALL

E. Bleed the air from the thrust reverser hydraulic system. (Ref. AMM TASK 78-30-00-710-040)

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