Installation of the T12 Sensor [CFML]

TASK 73-21-15-400-801-A
Installation of the T12 Sensor

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: 4001KS

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 2M (6 FT)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 65.1 and 58.9 lbf.in (0.74 and 0.67 m.daN )
No specific	Torque wrench: range to between 74.55 and 67.45 lbf.in (0.84 and 0.76 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2442)	engine oil

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 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 71-60-42-400-801-A	Installation of the Air Intake Cowl T12 Access Panel
TASK 73-29-00-710-802-A	FADEC Test (Menu Mode)
T12 Sensor (4001KS)

3. Job Set-up
Subtask 73-21-15-941-052-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
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 73-21-15-010-052-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 ACCESS PLATFORM 2M (6 FT) is in position.

4. Procedure
Subtask 73-21-15-420-050-A

A. Installation of the T12 sensor (1):

WARNING: USE PERSONAL PROTECTION EQUIPMENT. USE THE ENGINE OIL IN A WELL-VENTILATED AREA. ENGINE OIL IS TOXIC.

(1) Remove the COVER - PROTECTION and CAP - PROTECTION from the openings, tubes, hoses and connectors.
(2) Make sure that the mating surfaces are clean and clear of unwanted materials.
(3) Lubricate the threads of the four bolts (9) and the four nuts (11) with the engine oil (Material No.CP2442) .
(4) Install the T12 sensor (1) in the correct position on the mounting bracket (12) of the inlet case (3).
(5) Install the four nuts (11) to attach the T12 sensor (1) on the mounting bracket (12) and tighten by hand.
(6) Install the four washers (10) and the four bolts (9) to attach the T12 sensor (1) to the rear inlet bulkhead (4) and tighten them with your hand.
(7) TORQUE the four bolts (9) to between 65.1 and 58.9 lbf.in (0.74 and 0.67 m.daN )

.
(8) TORQUE the four nuts (11) to between 74.55 and 67.45 lbf.in (0.84 and 0.76 m.daN )

.
(9) Connection of the harness electrical connectors to the T12 sensor (1):

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

CAUTION: USE PLIERS THAT HAVE TEFLON JAWS TO TIGHTEN OR LOOSEN THE ELECTRICAL CONNECTORS. DO NOT USE PLIERS THAT HAVE METAL JAWS. METAL JAWS CAN CAUSE DAMAGE TO THE ELECTRICAL CONNECTORS.

(a) Connect the HJ6B harness electrical connector (7) to the HJ6B harness receptacle (8).
(b) Connect the HJ6A harness electrical connector (5) to the HJ6A harness receptacle (6).
(10) Install the T12 sensor access panel (2) (Ref. AMM TASK 71-60-42-400-801).

Subtask 73-21-15-710-051-A

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

5. Close-up
Subtask 73-21-15-410-052-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 access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:58:23 UTC