Repair of the Thrust Reverser Thermal Blankets [PW11]

TASK 78-32-00-300-802-A
Repair of the Thrust Reverser Thermal Blankets

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 DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

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 1M(3 FT)
No specific	1	GUN - SEALANT

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0001)	lint-free cotton cloth
(Material No.PU1-0061)	abrasive paper, aluminum oxide
(Material No.PU2-0001)	alcohol, isopropyl
(Material No.PU3-0003)	sealant
(Material No.PU3-0012)	catalyst
(Material No.PU4-0006)	primer

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, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-30-00-918-803-A	Consumable Materials Index for the Nacelle (UTC Aerospace Systems)
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 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Hole Repair of the Thrust Reverser Thermal Blanket

3. Job Set-up
Subtask 78-32-00-941-128-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 78-32-00-010-212-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 an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 78-32-00-040-135-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser 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 78-32-00-010-213-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust-reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

4. Procedure

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

Subtask 78-32-00-350-050-A ** ON A/C NOT FOR ALL

A. Repair of the Holes in the Metallic Surface of the Thermal Blanket

Hole Repair of the Thrust Reverser Thermal Blanket ** ON A/C NOT FOR ALL

NOTE: This procedure is for holes that are 0.06 in. (1.524 mm) x 0.25 in. (6.350 mm) or smaller in the metallic surface of the thermal blanket. For holes larger than 0.06 in. (1.524 mm) x 0.25 in. (6.350 mm), refer to the Structural Repair Manual for allowable damage limits and repair procedures or contact United Technologies Aerospace Systems for disposition.

(1) Lightly rub the surfaces and the edges of the repair area with the PU1-0061abrasive paper, aluminum oxide 180 or 240-grit.
(2) Remove the unwanted material from the surfaces of the repair area with the clean lint-free cotton cloth (Material No.PU1-0001) made moist with PU2-0001alcohol, isopropyl. Remove the solvent with the clean lint-free cotton cloth (Material No.PU1-0001) before the solvent dries.
(3) Clean again the surfaces of the repair area with the clean lint-free cotton cloth (Material No.PU1-0001) made moist with PU2-0001alcohol, isopropyl. Remove the solvent with the clean lint-free cotton cloth (Material No.PU1-0001) before the solvent dries.
(a) Make sure that you apply the sealant within four hours after you cleaned the surface.
(4) Apply a thin layer of primer (Material No.PU4-0006) or equivalent (Ref. AMM TASK 70-30-00-918-803), to the surface of the thermal blanket. Let the primer (Material No.PU4-0006) or equivalent (Ref. AMM TASK 70-30-00-918-803), dry for a minimum of 30 minutes.
(5) Mix the sealant (Material No.PU3-0003) and catalyst (Material No.PU3-0012) or equivalent (Ref. AMM TASK 70-30-00-918-803). Refer to the manufacturer's instructions.
(6) Apply the sealant (Material No.PU3-0003) mixture on the repair area of the thermal blanket with the GUN - SEALANT or equivalent. Make sure that you fully fill the hole and 0.25 in. (6.35 mm) minimum around the hole. Make sure that the sealant is 0.1 in. (2.54 mm) above the surface of the thermal blanket. See the figure

Hole Repair of the Thrust Reverser Thermal Blanket ** ON A/C NOT FOR ALL

5. Close-up
Subtask 78-32-00-410-201-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 cowl-door (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

Subtask 78-32-00-440-127-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).

Subtask 78-32-00-410-202-A ** ON A/C NOT FOR ALL

C. Close Access
(1) 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
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:13:10 UTC