Installation of the Exhaust Gas Temperature (EGT) Thermocouple [IAE]

TASK 77-21-15-400-010-A
Installation of the Exhaust Gas Temperature (EGT) Thermocouple

FIN: 4012KS1 ** ON A/C NOT FOR ALL
FIN: 4012KS2 ** ON A/C NOT FOR ALL
FIN: 4012KS3 ** ON A/C NOT FOR ALL
FIN: 4012KS4 ** 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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 18 and 15 lbf.in (0.20 and 0.17 m.daN )
No specific	Torque wrench: range to between 22 and 18 lbf.in (0.25 and 0.20 m.daN )
No specific	Torque wrench: range to between 110 and 90 lbf.in (1.24 and 1.02 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V02-141)	corrosion resistant steel lockwire

C. 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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
5	PISTON RING	AIPC 77-21-15-80-030

E. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-710-012-B	Test No.3 : Idle Leak Check
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 73-22-00-710-040-A	Operational Test of the FADEC SYSTEM on the Ground
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Exhaust Gas Temperature Thermocouple

3. Job Set-up
Subtask 77-21-15-860-050-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 77-21-15-010-051-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-010)
(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 78-32-00-010-010)
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 77-21-15-040-051-A ** ON A/C NOT FOR ALL

C. Make sure that the thrust reverser Hydraulic-Control-Unit (HCU) is deactivated: (Ref. AMM TASK 78-30-00-040-012)

4. Procedure
Subtask 77-21-15-420-050-A ** ON A/C NOT FOR ALL

A. Install the EGT thermocouple

Exhaust Gas Temperature Thermocouple ** ON A/C NOT FOR ALL

(1) Remove the caps from the openings.

NOTE: The EGT thermocouples are installed through the vanes numbered 3, 6, 8 and 11 of the turbine exhaust case.

(2) Install the two new AIPC 77-21-15-80-030 PISTON RING (5) in to the outer diameter groove of the thermocouple (4). Make sure that the openings in each of the piston rings are in the opposite positions.
(3) Install the thermocouple (4) in to the case. Align the bolt holes in the thermocouple with the bolt holes on the case boss.
(4) Install the two bolts (9).
(5) TORQUE the bolts (9) to between 110 and 90 lbf.in (1.24 and 1.02 m.daN )

.
(6) Safetying of the bolts

CAUTION: MAKE SURE THE SAFETY WIRE DOES NOT COME IN CONTACT WITH THERMOCOUPLE STUDS OR EGT HARNESS LEADS. THIS CAN CAUSE ERRATIC OR UNRELIABLE EGT INDICATION.

(a) Safety the bolts with corrosion resistant steel lockwire (Material No.V02-141) .
(7) Do the procedure again for the other three thermocouples.
(8) Connect the thermocouple harness leads:

CAUTION: YOU MUST MAKE SURE THAT THE TERMINAL LUG IS ALIGNED AND DOES NOT TOUCH THE INNER SURFACE OF THE COWL WHEN IT IS TIGHTENED TO PREVENT THE EGT HARNESS FROM BEING WORN-OUT WITH THE COWL.

CAUTION: DO NOT USE LUBRICATION ON THREADS OF THERMOCOUPLE CONNECTIONS. ENGINE OIL CAN CONTAMINATE EGT HARNESS INSULATION MATERIAL AND RESULT IN ERRATIC OR UNRELIABLE EGT INDICATION.

(a) Remove the nuts (3) and (7) and washers (10) and (11) from the terminals.
(b) Install the harness leads on to the studs (1) and (8).
(c) Install the nuts (3) and washers (11) on to the studs (1).
(d) Install the nuts (7) and washers (10) on to the studs (8).
(e) Tightening of the nuts

CAUTION: DO NOT TIGHTEN NUTS MORE THAN MAXIMUM TORQUE. TOO MUCH TORQUE CAN DAMAGE THE THERMOCOUPLE STUDS AND RESULT IN ERRATIC OR UNRELIABLE EGT INDICATION.

1 TORQUE the nuts (3) to between 18 and 15 lbf.in (0.20 and 0.17 m.daN )

.
2 TORQUE the nuts (7) to between 22 and 18 lbf.in (0.25 and 0.20 m.daN )

.
(f) Do the procedure again for the other three thermocouples.

5. Close-up
Subtask 77-21-15-410-050-A ** ON A/C NOT FOR ALL

A. Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR.
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 77-21-15-440-050-A ** ON A/C NOT FOR ALL

B. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 77-21-15-410-051-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 77-21-15-710-050-B ** ON A/C NOT FOR ALL

D. Test requirements:
(1) Do an operational test of the FADEC (Ref. AMM TASK 73-22-00-710-040) and make sure that on the CFDS no fault is shown related to the EGT Thermocouple.
(2) Do an idle leak check (Ref. AMM TASK 71-00-00-710-012).
(3) On the upper ECAM DU, make sure that the EGT indication is available.

[Rev.10 from 2021] 2026.04.01 03:18:11 UTC