Removal of the Compressor Discharge Temperature (T3) Sensor [CFMI]

TASK 77-23-10-000-001-A
Removal of the Compressor Discharge Temperature (T3) 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	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	CAP - BLANKING
No specific	AR	PLIERS - JAWED, SOFT
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
T3 Temperature Sensor - PRE SB 77-016
T3 Temperature Sensor - POST SB 77-016

3. Job Set-up
Subtask 77-23-10-941-050-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 77-23-10-010-050-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) in position.

Subtask 77-23-10-040-052-A ** ON A/C NOT FOR ALL

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

Subtask 77-23-10-010-054-A ** ON A/C NOT FOR ALL

D. Open the left thrust reverser cowl door (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL
(2) FOR [1000EM2] (ENGINE-2)
461AL

4. Procedure
Subtask 77-23-10-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Compressor Discharge Temperature (T3) Sensor

CAUTION: DO NOT BEND THE CONDUIT THAT CONNECTS THE THERMOCOUPLE PROBE AND THE ELECTRICAL CABLE CONNECTOR UNIT. YOU CAN CAUSE DAMAGE TO THE LEAD INSIDE THE CONDUIT.

(1) Disconnect the 2 electrical cable connectors (30), and (40). Use PLIERS - JAWED, SOFT if necessary.
(2) Put CAP - BLANKING on the disconnected electrical connectors.
(3) Cut and remove the lockwire from the 4 bolts (80) that attach the thermocouple unit to the combustion case. Remove the 4 bolts (80).

PRE SB 77-016

(4) Remove the bolt (50), nut (70), and washer (60) from the mid-conduit bracket.

END of PRE SB 77-016

POST SB 77-016

(5) Remove the bolt (50), and nut (70) from the mid-conduit bracket.

END of SB 77-016

(6) Remove the bolts (20) and nuts (10) that attach the electrical cable connector unit to the forward bracket.
(7) Remove the sensor from the combustion case. Discard the metal O-ring gasket (90) between the thermocouple probe and combustion case.

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