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

TASK 78-31-49-400-007-B
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	COVER - PROTECTION
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 )
HIX3005	1	SAFETY SLEEVE - PIVOTING DOOR ACTUATOR

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
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-30-00-710-040-B	Thrust Reverser Hydraulic System Bleed Procedure
TASK 78-32-41-480-001-A	Installation of the Safety Sleeve on Blocker Door Actuator
TASK 78-32-41-860-002-A	Manual Stowing of the Blocker Door
Hydraulic Control Unit (HCU) Bracket
Interface and Middle Brackets

3. Job Set-up
Subtask 78-31-49-860-102-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 78-31-49-010-159-A ** ON A/C NOT FOR ALL

B. Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 78-31-49-040-147-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 78-31-49-420-093-A ** ON A/C NOT FOR ALL

A. Installation of the HCU Bracket, Hydraulic Line Middle Bracket and Interface Bracket:
(1) Installation of the HCU bracket:
(a) Remove the protective covers from the pipe ends.
(b) Attach the HCU bracket to the hydraulic control unit with the bolts.

Hydraulic Control Unit (HCU) Bracket ** ON A/C NOT FOR ALL

.
(d) Connect the actuator rod supply pipe to the HCU bracket.
(e) TORQUE the coupling nut to between 410 and 370 lbf.in (4.63 and 4.18 m.daN )

.
(f) Connect the actuator head supply pipe to the HCU bracket.
(g) TORQUE the coupling nut to between 700 and 610 lbf.in (7.91 and 6.89 m.daN )

.
(h) Connect the lower blocker door supply pipe to the HCU bracket.
(i) TORQUE the coupling nut to between 300 and 260 lbf.in (3.39 and 2.94 m.daN )

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

.
(l) TORQUE 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 )

.
(m) TORQUE 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 )

.
(n) Connect the electrical harness to the HCU bracket with the clamp, the bolt and the nut.
(o) TORQUE the nut to between 40 and 30 lbf.in (0.45 and 0.34 m.daN )

.
(2) Installation of the hydraulic line middle bracket:
(a) Apply a layer of blindexite RT 342-2 (Material No.CP2318) on the mating surface of the middle bracket.
(b) Attach the bracket to the forward frame with the bolts and the nuts.

Interface and Middle Brackets ** ON A/C NOT FOR ALL

.
(d) Connect the rod supply junction pipe to the middle bracket.
(e) TORQUE the coupling nut to between 410 and 370 lbf.in (4.63 and 4.18 m.daN )

.
(f) Connect the head supply junction pipe to the middle bracket.
(g) TORQUE the coupling nut to between 700 and 610 lbf.in (7.91 and 6.89 m.daN )

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

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

.
(l) Attach the upper head shield to the bracket with the upper half clamp, the washer and the bolts.
(m) TORQUE the bolts to between 30 and 27 lbf.in (0.34 and 0.31 m.daN )

NOTE: Apply a witness line of finish paint EA4 blue 5991 (Material No.CP2245) on all nuts and connections after they are torqued.

(3) Remove the HIX3005 SAFETY SLEEVE - PIVOTING DOOR ACTUATOR without making the thrust reverser operational (Ref. AMM TASK 78-32-41-480-001).
(4) Installation of the Interface Bracket:
(a) Remove the COVER - PROTECTION from the pipe ends.
(b) Attach the interface bracket to the forward frame with the bolts.

Interface and Middle Brackets ** ON A/C NOT FOR ALL

.
(d) Connect the rod supply pipe to the interface bracket.
(e) TORQUE the coupling nut to between 260 and 235 lbf.in (2.94 and 2.66 m.daN )

.
(f) Connect the head supply pipe to the interface bracket.
(g) TORQUE the coupling nut to between 500 and 450 lbf.in (5.65 and 5.09 m.daN )

.
(h) Connect the latch return pipe and the upper latch supply pipe to the interface bracket.
(i) TORQUE the coupling nuts to between 300 and 260 lbf.in (3.39 and 2.94 m.daN )

.
(j) Attach the electrical harness to the interface bracket with the clamp, the bolt and the nut.
(k) TORQUE the nut to between 40 and 30 lbf.in (0.45 and 0.34 m.daN )

5. Close-up
Subtask 78-31-49-860-083-A ** ON A/C NOT FOR ALL

A. Close 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 78-32-41-860-002).

Subtask 78-31-49-440-098-A ** ON A/C NOT FOR ALL

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

Subtask 78-31-49-410-110-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) 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
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

Subtask 78-31-49-710-080-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 03:25:06 UTC