Removal of the High Pressure Turbine Clearance Control (HPTCC) Sensor [CFMB]

TASK 73-21-70-000-002-A
Removal of the High Pressure Turbine Clearance Control (HPTCC) Sensor

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
PRE SB 73-046
The HPTCC sensors are installed at 3:30 (channel B) and 9 o'clock (channel A) on the compressor discharge nozzle (CDN).The removal/installation procedure for both sensors is the same.
POST SB 73-046
The HPTCC sensor is installed at 3:30 o'clock (channel B) on the compressor discharge nozzle (CDN).

NOTE: The HPTCC sensor at the 9 o'clock position is deleted and replaced with a blankoff plate.
END SB 73-046

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	PLIERS - JAWED, SOFT
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, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 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
High Pressure Turbine Clearance Control Sensor POST SB 73-046

3. Job Set-up
Subtask 73-21-70-941-051-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 73-21-70-010-053-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 73-21-70-040-052-A ** ON A/C NOT FOR ALL

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

Subtask 73-21-70-010-054-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

4. Procedure
Subtask 73-21-70-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the HPTCC Sensor:
(1) Disconnect the electrical connector (50). Use PLIERS - JAWED, SOFT if necessary.
(2) Put CAP - BLANKING on the electrical connector (50) and the sensor (40).
(3) Cut and remove the lockwire from the bolts (10).
(4) Remove the bolts (10) and the washers (20) that attach the sensor (40) to the Compressor Discharge Nozzle (CDN).
(5) Remove the sensor (40) and gasket (30) from the CDN.
(6) Discard the gasket (30).
(7) Put a CAP - BLANKING on the probe of the sensor (40).
(8) Put a PLUG - BLANKING in the port of the CDN.

[Rev.10 from 2021] 2026.04.01 02:59:29 UTC