Installation of the Lower Fan Case Dual Channel Thermocouple [CFML]

TASK 77-22-12-400-801-A
Installation of the Lower Fan Case Dual Channel Thermocouple

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.

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

ZONE: 400
FIN: 4250KS2

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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.40 and 1.20 m.daN (123.89 and 106.19 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CPNCL00062)	Synthetic base lubricating oil - turbine engine

C. Work Zones and Access Panels

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

D. 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 73-29-00-710-802-A	FADEC Test (Menu Mode)
Lower Fan Case Dual Channel Thermocouple

3. Job Set-up
Subtask 77-22-12-941-051-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) are 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 77-22-12-010-051-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
(2) Make sure that the INSPECTION CREEPER is in position under the right fan cowl.

4. Procedure
Subtask 77-22-12-420-050-A

A. Installation of the Lower Fan Case Dual Channel Thermocouple
(1) Remove all the COVER - PROTECTION and the CAP - PROTECTION from the openings, tubes, hoses and connectors.
(2) Install the thermocouple (2) on the support bracket (3) as follows:
(a) Lubricate the threads of the bolts (5) with Synthetic base lubricating oil - turbine engine (Material No.CPNCL00062) .
(b) Install the three bolts (5) that attach the thermocouple (2) to the support bracket (3).
(c) TORQUE the three bolts (5) to between 1.40 and 1.20 m.daN (123.89 and 106.19 lbf.in )

.
(3) Connect electrical connector No. 1 (1) (P811B) of the HJ8B harness and electrical connector No. 2 (4) (P811A) of the HJ8A harness to the thermocouple (2) (Ref. AMM TASK 70-70-00-910-804).

Subtask 77-22-12-710-050-A

B. Test(s)
(1) Do the FADEC test (menu mode) (Ref. AMM TASK 73-29-00-710-802).

5. Close-up
Subtask 77-22-12-410-050-A

A. 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 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the INSPECTION CREEPER.
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 06:37:55 UTC