Installation of the Blocker Doors Actuation Levers [CFMI]

TASK 78-31-17-400-042-A
Installation of the Blocker Doors Actuation Levers

ZONE: 400
FIN: 4103KS1 ** ON A/C NOT FOR ALL
FIN: 4103KS2 ** 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 40 and 30 lbf.in (0.45 and 0.34 m.daN )
No specific	Torque wrench: range to between 40 and 35 lbf.in (0.45 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.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
10	LOCK WASHER	AIPC 78-31-17-01-040

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-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 78-31-00-710-040-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 78-31-17-400-040-A	Installation of the Blocker Door Deploy Switch
TASK 78-32-41-400-040-A	Installation of the Lower Blocker Door
TASK 78-32-41-400-041-A	Installation of the Upper Blocker Door
Blocker Door Switch, Actuation Levers and Beam Electrical Harness PRE SB RA32078-39
Blocker Door Switch, Actuation Levers and Beam Electrical Harness POST SB RA32078-39
Blocker Door Switch, Actuation Levers and Beam Electrical Harness

3. Job Set-up
Subtask 78-31-17-860-052-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 78-31-17-010-072-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 78-31-17-040-063-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 78-31-17-420-055-A ** ON A/C NOT FOR ALL

A. Installation of the Blocker Doors Actuation Levers

Blocker Door Switch, Actuation Levers and Beam Electrical Harness PRE SB RA32078-39 ** ON A/C NOT FOR ALL

Blocker Door Switch, Actuation Levers and Beam Electrical Harness POST SB RA32078-39 ** ON A/C NOT FOR ALL

Blocker Door Switch, Actuation Levers and Beam Electrical Harness ** ON A/C NOT FOR ALL

(1) Use a Textile-Lint free Cotton - (Material No.14SBA1) to make clean the outer lever.
(2) Use a Textile-Lint free Cotton - (Material No.14SBA1) to make clean the inner diameter of the bushing that the outer lever goes into.
(3) Put the outer lever into the bushing and make sure that it operates correctly.
(4) Install the outer lever into the bushing.
(5) Install the AIPC 78-31-17-01-040 LOCK WASHER (10) and the bolt.
(6) TORQUE the bolt to between 80 and 70 lbf.in (0.90 and 0.79 m.daN )

.
(7) Fold the lock washer to secure the bolt.
(8) Install the lower or upper blocker door (Ref. AMM TASK 78-32-41-400-040) or (Ref. AMM TASK 78-32-41-400-041).

PRE SB RA32078-39

(9) Install the trigger and attach with two bolts.
(10) TORQUE the bolts to between 40 and 35 lbf.in (0.45 and 0.40 m.daN )

POST SB RA32078-39

(11) Install the trigger and attach with the screw and the nut.
(12) TORQUE the nut to between 40 and 30 lbf.in (0.45 and 0.34 m.daN )

END OF SB RA32078-39

(13) Install the blocker door deploy switch (Ref. AMM TASK 78-31-17-400-040).

5. Close-up
Subtask 78-31-17-440-056-A ** ON A/C NOT FOR ALL

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

Subtask 78-31-17-410-065-A ** ON A/C NOT FOR ALL

B. 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 78-31-17-710-055-A ** ON A/C NOT FOR ALL

C. Do an operational test of the thrust reverser system from the CFDS (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 stopped (Ref. AMM TASK 78-31-00-710-040)
second method with engine in operation (Ref. AMM TASK 78-31-00-710-040)

[Rev.10 from 2021] 2026.04.02 06:37:58 UTC