Installation of the Compressor Discharge Temperature (T3) Sensor [CFMB]

TASK 77-23-10-400-002-A
Installation of the Compressor Discharge Temperature (T3) 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	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	PLIERS - JAWED, SOFT
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP8001)	lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)	lockwire 0.032 in. (0.8 mm) dia

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
90	METAL O-RING GASKET	AIPC 77-23-10-01-060

E. 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)
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
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
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
T3 Temperature Sensor - PRE SB 77-004
T3 Temperature Sensor - POST SB 77-004

3. Job Set-up
Subtask 77-23-10-860-051-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) is in position.

Subtask 77-23-10-010-053-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 77-23-10-040-051-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 77-23-10-420-051-A ** ON A/C NOT FOR ALL

A. Installation 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) Install the new AIPC 77-23-10-01-060 METAL O-RING GASKET (90) over the combustion case thermocouple probe port.
(2) Install the thermocouple into the combustion case port and put the electrical cable connector unit in position.
(3) Lubricate the thermocouple probe bolts (80) with graphite grease (Material No.CP2101) .

PRE SB 77-004

(4) Install the four bolts (80) in the thermocouple probe flange. TORQUE the bolts (80) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

.
(5) Installation of the lockwire:

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) Wirelock the bolts (80) with the CP8001lockwire 0.032 in. (0.8 mm) dia. or the CP8002lockwire 0.032 in. (0.8 mm) dia.
(6) Lubricate the electrical cable connector unit bolts (20) with graphite grease (Material No.CP2101) .
(7) Attach the electrical cable connector unit to the forward bracket with bolts (20) and nuts (10). TORQUE the nuts (10) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

.
(8) Lubricate the mid-conduit bracket bolt (50) with graphite grease (Material No.CP2101) .
(9) Install the bolt (50), washer (60) and nut (70) at the mid-conduit bracket. TORQUE the nut (70) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

.

END of PRE SB 77-004

POST SB 77-004

(10) Install the four bolts (80) in the thermocouple probe flange. Do not TORQUE the bolts (80) at this time.
(11) Lubricate the electrical cable connector unit bolts (20) with graphite grease (Material No.CP2101) .
(12) Attach the electrical cable connector unit to the attachment bracket with the bolts (20) and the nuts (10). Do not TORQUE the bolts (20) at this time.
(13) Lubricate the loop clamp bolt (50) with graphite grease (Material No.CP2101) .
(14) Install the bolt (50) and the nut (70) at the loop clamp (55). Do not TORQUE the nut (70) at this time.
(15) TORQUE the four bolts (80) in the thermocouple probe flange to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

.
(16) Installation of the lockwire:

(a) Attach the bolts (80) with the CP8001lockwire 0.032 in. (0.8 mm) dia. or the CP8002lockwire 0.032 in. (0.8 mm) dia.
(17) TORQUE the nuts (10) in the electrical cable connector unit to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

.
(18) TORQUE the nut (70) at the loop clamp (55) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

.

END of POST SB 77-004

(19) Remove the CAP-BLANKING from each electrical connector and receptacle.
(20) Make sure that all the electrical connections are clean and in the correct condition.
(21) Connect the 2 electrical cable connectors (30, 40). Tighten the connectors by hand. If necessary, use the PLIERS - JAWED, SOFT to fully seat the connectors.

5. Close-up
Subtask 77-23-10-410-052-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 77-23-10-440-050-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 77-23-10-710-051-A ** ON A/C NOT FOR ALL

C. Do a FADEC ground test (Ref. AMM TASK 73-29-00-710-040).

Subtask 77-23-10-410-053-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.02 06:37:43 UTC