Removal of the T3 Sensor [CFML]

TASK 73-21-25-000-801-A
Removal of the T3 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.

FIN: 4084KS

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	AR	CAP - PROTECTION
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-70-00-910-804-A	Electrical Standard Practices
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 75-22-05-000-801-A	Removal of the Low Pressure Turbine Active Clearance Control (LPT ACC) Valve
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
T3 Sensor (PRE and POST SB 72-0036 and PRE and POST SB 72-0268)

3. Job Set-up
Subtask 73-21-25-941-050-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) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch, and
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) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 73-21-25-010-050-A

B. Get Access
(1) Open the fan cowl doors (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) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 73-21-25-040-050-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 73-21-25-010-051-A

D. Open the left thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-806):
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL

4. Procedure
Subtask 73-21-25-020-050-A

A. Removal of the T3 Sensor
(1) Remove the Low Pressure Turbine (LPT) Active Clearance Control (ACC) valve (Ref. AMM TASK 75-22-05-000-801).
(a) Disconnect the High Pressure Turbine (HPT) drain tube (13) from the HPT ACC valve (15).
(b) Disconnect the HPT drain tube (13) from the HPT drain tube (18).
(c) Remove the bolt (12) that attaches the loop clamp (14) and the HPT drain tube (13) to the support bracket (8).
(d) Remove the bolt (17) that attaches the loop clamp (19) and the HPT drain tube (13) to the support bracket (16).
(e) Remove the bolt (20) that attaches the loop clamp (21) and the HPT drain tube (13) to the support bracket (22) and remove the HPT drain tube (13) from the engine.
(2) Disconnect the electrical connector (5) and electrical connector (6) from the T3 sensor (1) (Ref. AMM TASK 70-70-00-910-804).
(3) Remove the two bolts (7) that attach the T3 sensor (1) to the bracket (2).
(4) Remove the bolt (3) that attaches the loop clamp (4) and the T3 sensor (1) tube to the bracket (2).
(5) Remove the bolt (11) that attaches the loop clamp (10) and the T3 sensor (1) tube to the support bracket (8) and support bracket (9).
(6) Remove the bolt (24) that attaches the loop clamp (25) and the T3 sensor (1) tube to the bracket (26).
(7) Disconnection of the T3 sensor (1)

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(a) Remove the lockwire and disconnect the T3 sensor (1) from the combustion case threaded insert adapter (23).
(8) Remove the T3 sensor (1) from the engine.

Subtask 73-21-25-420-050-A

B. Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and connectors.

[Rev.10 from 2021] 2026.04.01 13:07:08 UTC