Installation of the Blocker Door Hydraulic Actuator Clevis [CFMI]

TASK 78-31-41-400-802-A
Installation of the Blocker Door Hydraulic Actuator Clevis

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

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)
No specific	AR	WRENCH - TORQUE
No specific	Torque wrench: range to between 17 and 15 lbf.in (0.19 and 0.17 m.daN )
No specific	Torque wrench: range to between 44 and 35 lbf.in (0.50 and 0.40 m.daN )
No specific	Torque wrench: range to between 80 and 70 lbf.in (0.90 and 0.79 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1041)	isopropyl alcohol
(Material No.CP2104)	molykote G rapid
(Material No.CP2212)	hydraulic fluid NSA-307-110 type 4
(Material No.14SBA1)	Textile-Lint free Cotton -

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. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
30	COTTER PIN	AIPC 78-31-41-02-030

E. 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 78-31-00-710-040-A	Operational Test of the Thrust Reverser System
TASK 78-31-00-710-040-A-01	Operational Test of the Thrust Reverser without CFDS - Engine not Running
TASK 78-31-00-710-040-A-02	Operational Test of the Thrust Reverser without CFDS - Engine Running
TASK 78-32-41-860-041-A	Manual Stowing of the Blocker Door
Hydraulic Actuator Clevis
Hold-Open Rod of the Blocker Door (HIX3002)

3. Job Set-up
Subtask 78-31-41-860-074-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on 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 on the right side of the engine.
(4) For the lower blocker door, make sure that the clevis access door is removed as follows:

Hydraulic Actuator Clevis ** ON A/C NOT FOR ALL

(a) Make sure that the three screws are removed.
(b) Make sure that the access door is removed.
(5) For the upper blocker door, make sure that the clevis access door is removed as follows:
(a) Make sure that the eight screws are removed.
(b) Make sure that the access door is removed.

Subtask 78-31-41-010-084-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.

Subtask 78-31-41-040-071-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser

WARNING: MAKE THE THRUST REVERSER UNSERVICEABLE. IF THE THRUST REVERSER IS NOT MADE UNSERVICEABLE, IT CAN OPERATE ACCIDENTALLY BECAUSE THE BLOCKER DOOR HOLD-OPEN ROD DOES NOT RESIST THE ACTUATOR HYDRAULIC PRESSURE. THIS CAN CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT.

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

4. Procedure

CAUTION: DO NOT PUSH ON THE STOW SWITCH LEVER WHEN BLOCKER DOOR IS OPENED OR DAMAGE COULD OCCUR.

Subtask 78-31-41-420-069-A ** ON A/C NOT FOR ALL

A. Installation of the Blocker Door Hydraulic Actuator Clevis
(1) Install the hydraulic actuator clevis on the actuator.

CAUTION: ADJUSTMENTS TO THE ROD EYE END OF THE HYDRAULIC ACTUATOR ROD, CAN ONLY BE PERFORMED IN THE SHOP SETTING USING THE FIXTURE PNR Q21806. ON WING ADJUSTMENTS MAY LEAD TO MISSRIGGING OF ACTUATOR AND UNCORRECT LOCK OF THE BLOCKER DOOR. THIS COULD CAUSE THE BLOCKER DOOR TO UNLOCK DURING FLIGHT.

CAUTION: BEFORE PERFORMING THE FOLLOWING CHECK, THE CLEVIS PIN THREADS MUST BE FREE OF DEBRIS AND CONTAMINATION.

(a) Apply molykote G rapid (Material No.CP2104) on the pin.
(b) Install the pin, the washer and put the castellated nut on the thread.
(c) Measure the breakaway torque (A) of the nut.
1 Set the WRENCH - TORQUE to 9.47 lbf.in (0.107 m.daN). Tighten the nut with the WRENCH - TORQUE. Make sure that the nut does not turn until you get the set torque value.
2 If the nut rotates before you get to 9.47 lbf.in (0.107 m.daN), replace the nut.
3 TORQUE the nut to torque (A) plus 217 lbf.in (2.45 m.daN).

NOTE: The nut can be tightened 1/12 of a turn maximum to put the bolt hole in line with a castle of the nut.

(d) Install the new AIPC 78-31-41-02-030 COTTER PIN (30).
(2) Install the hydraulic actuator clevis on the blocker door.

NOTE: Before installation, take care to align the clevis holes with the blocker door holes.

(a) Install the four washers and the bolts.
(b) Make sure the bolts protrude through the locknut a minimum of 1.5 threads.
(c) TORQUE the bolts to between 80 and 70 lbf.in (0.90 and 0.79 m.daN )

Subtask 78-31-41-080-057-A ** ON A/C NOT FOR ALL

B. Removal of the hold-open rod of the blocker door (HIX3002).
(1) Remove the knurled bolts from the blocker door and the lock-out fitting.
(2) Manually bring the blocker doors

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

(a) Move the blocker doors to the closed position manually (Ref. AMM TASK 78-32-41-860-041).
(3) Install the lock-out fairing and the screw on the blocker door.
(4) TORQUE the screw to between 17 and 15 lbf.in (0.19 and 0.17 m.daN )

Subtask 78-31-41-110-055-A ** ON A/C NOT FOR ALL

C. Clean the Hydraulic Actuator Rod
(1) Use isopropyl alcohol (Material No.CP1041) and a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) to clean the actuator rod. Make sure that you clean around the end of the cylinder where additional debris will collect.
(2) After cleaning, use hydraulic fluid wipes and do as follows:
(a) Wipe the piston and cylinder/actuator cap rod end with isopropyl alcohol (Material No.CP1041) .
(b) Wipe the piston with hydraulic fluid NSA-307-110 type 4 (Material No.CP2212) .

Subtask 78-31-41-410-079-A ** ON A/C NOT FOR ALL

D. Close Access
(1) For the lower blocker door, install the clevis access door as follows:
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(c) Install the three screws to attach the access door.
(d) TORQUE the three screws from to between 44 and 35 lbf.in (0.50 and 0.40 m.daN )

.
(2) For the upper blocker door, install the clevis access door as follows:
(a) Install the eight screws to attach the access door.
(b) TORQUE the screws to between 44 and 35 lbf.in (0.50 and 0.40 m.daN )

.
(3) Make sure that the work area is clean and clear of tools and other items.

5. Close-up
Subtask 78-31-41-440-067-A ** ON A/C NOT FOR ALL

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

Subtask 78-31-41-410-080-A ** ON A/C NOT FOR ALL

B. 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 78-31-41-710-057-A ** ON A/C NOT FOR ALL

C. Do an operational test:
(1) Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-040).

NOTE: As an alternative procedure, you can do this operational test without the CFDS:

First method with engine not running (Ref. AMM TASK 78-31-00-710-040)
Second method with engine running (Ref. AMM TASK 78-31-00-710-040).

[Rev.10 from 2021] 2026.04.01 03:20:54 UTC