Installation of the Electrical Tertiary Lock System [CFML]

TASK 78-37-51-400-805-A
Installation of the Electrical Tertiary Lock System

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

ZONE: 400
FIN: 4005EG

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	CAP - PROTECTION
No specific	AR	COVER - PROTECTION
No specific	1	PLIERS - JAWED, SOFT
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.57 and 1.15 m.daN (138.94 and 101.77 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-70-00-910-804-A	Electrical Standard Practices
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 73-29-00-740-804-A	Thrust Reverser Cycling Test (Menu Mode)
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
TASK 78-32-50-010-801-A	Manually Deploy the Translating Cowl
TASK 78-32-50-410-801-A	Manually Stow the Translating Cowl
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
TASK 78-37-51-720-801-A	Functional Check of the Electrical Tertiary Lock System (TLS)
Electrical Tertiary Lock System

3. Job Set-up
Subtask 78-37-51-941-074-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Make sure that the WARNING NOTICE(S) is in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 78-37-51-010-095-A

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 78-37-51-040-065-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Make sure that you did the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 78-37-51-010-096-A

D. Make sure that the translating cowl is manually deployed approximately 5 in. (127.00 mm). (Ref. AMM TASK 78-32-50-010-801).

Subtask 78-37-51-010-100-A

E. Opening of the left thrust reverser cowl-door

CAUTION: DO NOT OPEN THE THRUST REVERSER IF YOU CANNOT STOW THE TRANSLATING COWL, AND THE TRANSLATING COWL IS DEPLOYED MORE THAN 10 INCHES (254 MM). IF YOU DO, THE TRANSLATING COWL CAN HIT THE WING AND CAUSE DAMAGE TO EQUIPMENT.

(1) Make sure that the left thrust reverser cowl-door is open (Ref. AMM TASK 78-36-00-010-806)>.
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL

4. Procedure
Subtask 78-37-51-420-064-A

A. Installation of the Electrical Tertiary Lock-System (9)
(1) Remove all the COVER - PROTECTION and CAP - PROTECTION from the openings, tubes, hoses, and connectors.
(2) Carefully put the tertiary lock system (9) in position on the latch beam on the left half of the thrust reverser.
(3) Install the four bolts (10) to attach the tertiary lock system (9) to the thrust reverser.
(4) TORQUE the four bolts (10) to between 1.57 and 1.15 m.daN (138.94 and 101.77 lbf.in )

.
(5) Connect the electrical connectors on the electrical harnesses (1) and (4) to the tertiary lock system (9) as follows (Ref. AMM TASK 70-70-00-910-804):

NOTE: Only if necessary, use the PLIERS - JAWED, SOFT to connect the electrical connectors.

(a) Connect the electrical connector (6) to the proximity sensor (2).
(b) Connect the electrical connector (5) to the proximity sensor (3).
(c) Connect the electrical connector (8) to the solenoid (7).
(6) If removed from the spring clips, push the electrical harnesses (1) and (4) into the spring clips.

5. Close-up
Subtask 78-37-51-410-076-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the left thrust reverser cowl door (Ref. AMM TASK 78-36-00-410-806).
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL
(3) Manually stow the translating cowl (Ref. AMM TASK 78-32-50-410-801).

Subtask 78-37-51-710-058-A

B. Test
(1) Do the functional test of the tertiary lock system (Ref. AMM TASK 78-37-51-720-801).

Subtask 78-37-51-440-058-A

C. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 78-37-51-410-077-A

D. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803).
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

Subtask 78-37-51-710-060-A

E. Test
(1) Do the cycling test of the thrust reverser (Ref. AMM TASK 73-29-00-740-804).

Subtask 78-37-51-942-050-A

F. Close Access
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:37:27 UTC