Installation of the T12 Temperature Sensor [CFMB]

TASK 73-21-40-400-001-A
Installation of the T12 Temperature Sensor

ZONE: 400
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)-ADJUSTABLE
No specific	1	MAT - PROTECTIVE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 42 and 38 lbf.in (0.4746 and 0.4294 m.daN )
No specific	Torque wrench: range to between 110.62 and 97.35 lbf.in (1.25 and 1.10 m.daN )

B. 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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 73-29-00-710-040-B-02	Operational Test of the FADEC on the Ground (with Engine Non motoring)
T12 Sensor

3. Job Set-up
Subtask 73-21-40-860-050-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)-ADJUSTABLE is in position.
(4) Make sure that MAT - PROTECTIVE is in position.

Subtask 73-21-40-010-051-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

4. Procedure
Subtask 73-21-40-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the T12 temperature sensor.
(1) Install the T12 sensor on the fan frame boss.

NOTE: Post CFM SB 72-0763 T12 sensor must be secure to the fan frame boss using Post CFM SB 72-0763 bolts.

(2) Secure the T12 sensor to the fan frame boss using 4 bolts and washers. TORQUE the bolts to between 110.62 and 97.35 lbf.in (1.25 and 1.10 m.daN )

.
(3) Remove the blanking cap from the electrical connectors and the blanking plug from the sensor housing.
(4) Install the electrical connectors on the sensor housing .
(5) Install the housing strip on the sensor housing.
(6) Install the nut and washer which secure the bonding strip to the sensor housing. TORQUE the nut to between 42 and 38 lbf.in (0.4746 and 0.4294 m.daN )

Subtask 73-21-40-869-052-A ** ON A/C NOT FOR ALL

B. Make sure that the work area is clean and clear of tools and other items.

Subtask 73-21-40-942-051-A ** ON A/C NOT FOR ALL

C. Put the aircraft back to its initial configuration.
(1) Remove the MAT - PROTECTIVE from the inlet cowl.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 73-21-40-710-050-A ** ON A/C NOT FOR ALL

D. Do a FADEC ground test (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).

5. Close-up
Subtask 73-21-40-410-050-A ** ON A/C NOT FOR ALL

A. Close the fan cowl doors : (Ref. AMM TASK 71-13-00-410-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

[Rev.10 from 2021] 2026.04.01 02:58:31 UTC