Removal of the T25 Temperature Sensor [CFMB]

TASK 73-21-20-000-002-A
Removal of the T25 Temperature Sensor

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 - BLANKING
No specific	AR	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
T25 Sensor

3. Job Set-up
Subtask 73-21-20-941-052-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).

Subtask 73-21-20-010-055-A ** ON A/C NOT FOR ALL

B. Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 73-21-20-040-052-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 73-21-20-010-058-A ** ON A/C NOT FOR ALL

D. Open the right thrust reverser door: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
452AR
(2) FOR [1000EM2] (ENGINE-2)
462AR

4. Procedure
Subtask 73-21-20-010-056-A ** ON A/C NOT FOR ALL

A. Loosen the 4 bolts that attach the fan frame duct panel between the 4 and 5 o'clock struts of the fan frame. Remove fan frame duct panel.

Subtask 73-21-20-020-053-A ** ON A/C NOT FOR ALL

B. Disconnect T25 wiring harness from T25 sensor.

Subtask 73-21-20-020-052-A ** ON A/C NOT FOR ALL

C. Removal of the T25 sensor:
(1) Remove the 4 bolts (10) which attach the T25 sensor (20), and carefully remove sensor.
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Install a PLUG - BLANKING on sensor housing.

[Rev.10 from 2021] 2026.04.01 02:58:24 UTC