General Visual Inspection (GVI) of the Proximity Sensor Targets [PW11]

TASK 78-31-00-210-802-A
General Visual Inspection (GVI) of the Proximity Sensor Targets

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.

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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
413AT, 437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
423AT, 447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 54-52-11-000-805-A	Removal of the Access Skin Panels
TASK 54-52-11-400-805-A	Installation of the Access Skin Panels
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
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 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-31-01-000-801-A	Removal of the Thrust Reverser Actuation System (TRAS) Hydraulic Control Unit (HCU)
TASK 78-31-01-400-801-A	Installation of the Thrust Reverser Actuation System (TRAS) Hydraulic Control Unit (HCU)
TASK 78-31-03-000-801-A	Removal of the TRAS Locking Actuator
TASK 78-31-03-400-801-A	Installation of the TRAS Locking Actuator
TASK 78-31-04-000-801-A	Removal of the TRAS Locking-Feedback Actuator
TASK 78-31-04-400-801-A	Installation of the TRAS Locking-Feedback Actuator
HCU Proximity Sensor Targets
Actuator Proximity Sensor Targets

3. Job Set-up
Subtask 78-31-00-941-065-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 78-31-00-010-069-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

4. Procedure

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

Subtask 78-31-00-210-056-A ** ON A/C NOT FOR ALL

A. Do a GVI of the Hydraulic Control Unit (HCU) Proximity Sensor Targets

HCU Proximity Sensor Targets ** ON A/C NOT FOR ALL

(1) Do not discard a part until you are sure that there are no repairs available. If you reject a part and no repair is available, contact United Technologies Aerospace Systems (UTAS) for disposition.
(2) Remove the access panel on the pylon to get access to the HCU (Ref. AMM TASK 54-52-11-000-805):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
413AT
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
423AT
(3) Examine the proximity sensor targets on the HCU. Look for bends, cracks, broken targets, missing targets and other damage.
(4) If you find damage, replace the HCU (Ref. AMM TASK 78-31-01-000-801) and (Ref. AMM TASK 78-31-01-400-801) or contact UTAS for disposition.

Subtask 78-31-00-010-068-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (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) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 78-31-00-040-058-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser System for Ground 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 ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 78-31-00-210-057-A ** ON A/C NOT FOR ALL

D. Do a GVI of the Feedback Locking Actuator Proximity Sensor Targets

Actuator Proximity Sensor Targets ** ON A/C NOT FOR ALL

(1) Do not discard a part until you are sure that there are no repairs available. If you reject a part and no repair is available, contact UTAS for disposition.
(2) Examine the proximity sensor targets on the feedback locking actuator. Look for bends, cracks, broken targets, missing targets and other damage.
(3) If you find damage, replace the feedback locking actuator (Ref. AMM TASK 78-31-04-000-801) and (Ref. AMM TASK 78-31-04-400-801) or contact UTAS for disposition.

Subtask 78-31-00-210-058-A ** ON A/C NOT FOR ALL

E. Do a GVI of the Locking Actuator Proximity Sensor Targets

Actuator Proximity Sensor Targets ** ON A/C NOT FOR ALL

(1) Do not discard a part until you are sure that there are no repairs available. If you reject a part and no repair is available, contact UTAS for disposition.
(2) Examine the proximity sensor targets on the locking actuator. Look for bends, cracks, broken targets, missing targets and other damage.
(3) If you find damage, replace the locking actuator (Ref. AMM TASK 78-31-03-000-801) and (Ref. AMM TASK 78-31-03-400-801) or contact UTAS for disposition.

5. Close-up
Subtask 78-31-00-410-064-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 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
(3) Install the access panel on the pylon (Ref. AMM TASK 54-52-11-400-805):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
413AT
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
423AT
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).

Subtask 78-31-00-440-057-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).

[Rev.10 from 2021] 2026.04.01 03:31:02 UTC