Installation of the T2 Probe [PW11]

TASK 71-61-12-400-801-A
Installation of the T2 Probe

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 400

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 2M (6 FT) - ADJUSTABLE
No specific	1	PLIERS - JAWED, SOFT
No specific	Torque wrench: range to between 90 and 75 lbf.in (1.02 and 0.85 m.daN )
No specific	Torque wrench: range to between 100 and 90 lbf.in (1.13 and 1.02 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0001)	lint-free cotton cloth
(Material No.PU1-0003)	abrasive paper, 220-Grit
(Material No.PU1-0028)	tying tape
(Material No.PU2-0001)	alcohol, isopropyl
(Material No.PU2-0003)	Bonderite M-CR 1132 Aero
(Material No.PU3-0004)	sealant
(Material No.PU3-0004A)	sealant

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-832-A	Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 71-61-11-000-801-A	Removal of the Aft Bulkhead T2 Panel
TASK 71-61-11-400-801-A	Installation of the Aft Bulkhead T2 Panel
TASK 73-21-00-710-806-A	Test No.7 - EEC Operation Test (Self Test)
TASK 73-25-34-400-802-A	Installation of the Engine Interface Unit (EIU)
T2 Probe

3. Job Set-up
Subtask 71-61-12-941-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832).

Subtask 71-61-12-010-051-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.
(3) Make sure that the aft-bulkhead T2 panel is removed (Ref. AMM TASK 71-61-11-000-801).

4. Procedure

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

Subtask 71-61-12-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the T2 Probe
(1) Removal of the protection covers:

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

(a) Remove all the necessary COVER - PROTECTION to prevent damage to the engine.
(2) Installation of the T2 probe (1):
(a) Loosely install the T2 probe (1) on the inlet-cowl inner barrel with the four nuts (6).
(b) Adjust the T2 probe (1) until it is in the center of the hole in the inlet-cowl inner barrel. Make sure that the T2 probe (1) does not touch the edge of the hole in the inlet-cowl inner barrel.
(3) TORQUE the four nuts (6) to between 100 and 90 lbf.in (1.13 and 1.02 m.daN )

in opposite pairs.
(4) Attach the ground wire (4) to the T2 probe (1) as follows:

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(a) Remove the coating from the mating surfaces of the T2 lug with PU1-0003abrasive paper, 220-Grit.
(b) Clean the faying surface with a clean lint-free cotton cloth (Material No.PU1-0001) and the PU2-0001alcohol, isopropyl
(c) Remove the PU2-0001alcohol, isopropyl with a clean lint-free cotton cloth (Material No.PU1-0001) before it dries.
(d) Brush Bonderite M-CR 1132 Aero (Material No.PU2-0003) on the faying surface. Apply two coats of Bonderite M-CR 1132 Aero (Material No.PU2-0003) . Allow the first coat to dry before you apply the second coat. Apply the second coat 90 degrees from the direction of the first coat. Refer to the manufacturer's instructions.

NOTE: Make sure that you brush the Bonderite M-CR 1132 Aero (Material No.PU2-0003) on the faying surface in less than three hours after you remove the coating.

(e) Attach the ground wire (4) to the T2 probe (1) with the bolt (2), the two washer (3) and the nut (5).
(f) TORQUE the nut (5) to between 90 and 75 lbf.in (1.02 and 0.85 m.daN )

.
(g) Measure the resistance between the ground wire (4) lug and the nut (5). Make sure that it is less than 0.0025 ohms. If the resistance is more than 0.0025 ohms, remove bolt (2), two washers (3) and nut (5) and repeat steps 4.A.(4)(a) thru 4.A.(4)(g) again.

NOTE: If necessary, you can remove the coating on the mating surfaces of the T2 lug to get the maximum electrical resistance requirements. Refer to steps 4.A.(4)(a) thru 4.A.(4)(c).

(h) Apply the sealant (Material No.PU3-0004) on the bolt (2), washers (3), nut (5) and ground wire (4) lug.

NOTE: Apply sealant (Material No.PU3-0004) on all the bare metal surfaces as necessary.

NOTE: You can use sealant (Material No.PU3-0004A) as an alternative to sealant (Material No.PU3-0004) .

(5) Cut the tying tape (Material No.PU1-0028) or equivalent that attaches the wiring harness (D1000P) to the engine structure.
(6) Remove the COVER - PROTECTION from the wiring harness (D1000P) connector and the T2 probe.
(7) Connection of the connector to the T2 Probe.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTOR AND RECEPTACLE ARE CLEAN WHEN YOU CONNECT THEM. DIRTY CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

CAUTION: USE PLIERS THAT HAVE TEFLON JAWS TO TIGHTEN THE ELECTRICAL CONNECTORS. DO NOT USE PLIERS THAT HAVE METAL JAWS. METAL JAWS CAN CAUSE DAMAGE TO THE ELECTRICAL CONNECTORS.

(a) Connect the wiring harness connector (D1000P) to the T2 probe (1) with the PLIERS - JAWED, SOFT.
(b) Turn the connector finger-tight.
(c) Turn the connector one quarter of a turn more with the PLIERS - JAWED, SOFT.
(8) Make sure that the work area is clean and clear of tools and other items.

5. Close-up
Subtask 71-61-12-710-050-A ** ON A/C NOT FOR ALL

A. Test
(1) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802).
(2) Do the Test N°7 - EEC Operation Test (Self Test) (Ref. AMM TASK 73-21-00-710-806).

Subtask 71-61-12-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Install the aft-bulkhead T2 panel (Ref. AMM TASK 71-61-11-400-801).
(2) Remove the access platform(s).
(3) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:57:35 UTC