Removal of the T12 Temperature Sensor [CFMB]

TASK 73-21-40-000-001-A
Removal of the T12 Temperature Sensor

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** 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	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	MAT - PROTECTIVE
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
T12 Sensor

3. Job Set-up
Subtask 73-21-40-941-052-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
(4) Put the ACCESS PLATFORM 1M(3 FT) in position.
(5) Install MAT - PROTECTIVE in the lower half of the inlet cowl.

Subtask 73-21-40-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.

4. Procedure
Subtask 73-21-40-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the T12 temperature sensor.
(1) Disconnect the two electrical connectors from the T12 sensor.
(2) Remove the nut and washer which attach the bonding strip to the T12 sensor and remove bonding strip connector.
(3) Remove and retain the 4 bolts and washers which attach the T12 sensor.
(4) Carefully remove the T12 sensor from the fan frame boss.
(5) Put blanking caps on the electrical connectors.
(6) Install blanking plugs on the sensor housing.

[Rev.10 from 2021] 2026.04.01 02:58:30 UTC