Preservation of the Inlet Cowl Lipskin [PW11]

TASK 71-61-10-620-801-A
Preservation of the Inlet Cowl Lipskin

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 AFTER SHUTDOWN. THE ENGINE 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
This procedure gives instructions to preserve the inlet cowl lipskin for parking or storage. Refer to ATA Chapter 10 and 71 for more information before you do this procedure.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	2	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	COVER - PROTECTION

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0001)	Cotton Cloth, Lint-Free
(Material No.PU1-0104)	masking tape
(Material No.PU1-0118)	3903 Vinyl Duct Tape
(Material No.PU1-0119)	Protex 8216-2L Protective Tape
(Material No.PU1-0120)	Riveters Tape 685
(Material No.PU10-0060)	spray equipment, standard
(Material No.PU2-0002)	Acetone
(Material No.PU4-0050)	Z-6148 Water-Borne Preservation Topcoat
(Material No.PU4-0051)	Z-6160 Peelable Preservation Basecoat

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

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 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
Inlet Cowl Lipskin Preservation

3. Job Set-up
Subtask 71-61-10-862-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do 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 71-61-10-420-059-A ** ON A/C NOT FOR ALL

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

Subtask 71-61-10-040-050-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).

4. Procedure
Subtask 71-61-10-620-050-A ** ON A/C NOT FOR ALL

CAUTION: DO NOT LET THE PROTECTIVE COATING DRY ON THE MASKING TAPE. IF THE PROTECTIVE COATING DRIES ON THE MASKING TAPE, DAMAGE TO THE PROTECTIVE COATING CAN OCCUR WHEN YOU REMOVE THE MASKING TAPE

A. Preservation of the Inlet Cowl Lipskin for Storage

Inlet Cowl Lipskin Preservation ** ON A/C NOT FOR ALL

NOTE: You can use this preservation coating for a maximum of six months.

(1) Make sure that you remove and install all the COVER - PROTECTION as necessary to prevent damage to the engine and adjacent components.
(2) Make sure that you wipe clean all parts and tools as necessary to remove unwanted debris and prevent damage to the engine and adjacent components.
(3) Clean the surface of the inlet cowl lipskin:
(a) Clean the surface of the inlet cowl lipskin with a clean PU1-0001Cotton Cloth, Lint-Free and Acetone (Material No.PU2-0002) .
(b) Remove all the dust, dirt, unwanted material, oil, grease and moisture.
(c) Remove the Acetone (Material No.PU2-0002) with a clean PU1-0001Cotton Cloth, Lint-Free before the solvent dries.
(d) Make sure that the surface of the inlet cowl lipskin is clean, dry and water-break-free.
(4) Apply a mask on the inlet cowl lipskin:
(a) Apply the Protex 8216-2L Protective Tape (Material No.PU1-0119) or the Riveters Tape 685 (Material No.PU1-0120) on the fasteners along the inner surface of the lipskin to help prevent coating removal of the fastener heads.
(b) Apply the 3903 Vinyl Duct Tape (Material No.PU1-0118) to the edge of the inner surface of the lipskin and the sealant between the lipskin and the inner barrel.
1 Make sure that the 3903 Vinyl Duct Tape (Material No.PU1-0118) fully covers the Protex 8216-2L Protective Tape (Material No.PU1-0119) or the Riveters Tape 685 (Material No.PU1-0120) .
(c) Apply the Protex 8216-2L Protective Tape (Material No.PU1-0119) or the Riveters Tape 685 (Material No.PU1-0120) on the hoist point fasteners to help prevent coating removal of the fastener heads.
(d) Apply the 3903 Vinyl Duct Tape (Material No.PU1-0118) on the edge of the outer surface of the lipskin and the sealant between the lipskin and the outer barrel.
(e) Make sure that the 3903 Vinyl Duct Tape (Material No.PU1-0118) covers all the fasteners on the lipskin:
1 Make sure that the 3903 Vinyl Duct Tape (Material No.PU1-0118) fully covers the Protex 8216-2L Protective Tape (Material No.PU1-0119) or the Riveters Tape 685 (Material No.PU1-0120) on the hoist point fasteners.
(f) Apply the 3903 Vinyl Duct Tape (Material No.PU1-0118) to the exhaust holes at the bottom of the lipskin.
(g) Apply three layers of the masking tape (Material No.PU1-0104) to the inner and outer barrel assemblies to provide protection from overspray.

NOTE: Apply the second and third layer with a small overlap of the layer before it.

(h) Install the COVER - PROTECTION on the fan blades and adjacent components to provide protection from overspray.
(5) Apply the protective coating on the inlet cowl lipskin:

NOTE: Before you apply the basecoat and topcoat, refer to the instructions of the manufacturer for application and recommended spray equipment.

(a) Spray a 0.004 in. (4 mils) layer of the Z-6160 Peelable Preservation Basecoat (Material No.PU4-0051) on the lipskin with the PU10-0060spray equipment, standard:
1 Spray the Z-6160 Peelable Preservation Basecoat (Material No.PU4-0051) approximately 6 - 8 in. (15 - 20 cm) from the surface in a forward to aft direction.
2 Spray the outer edge of the lipskin first, then the inner edge.
(b) Remove the top layer of the masking tape (Material No.PU1-0104) before the Z-6160 Peelable Preservation Basecoat (Material No.PU4-0051) dries.
(c) Let the layer dry for one hour.
(d) Apply a second layer of the Z-6160 Peelable Preservation Basecoat (Material No.PU4-0051) to get a total thickness of 0.008 in. (8 mils).
(e) Remove the second layer of the masking tape (Material No.PU1-0104) before the Z-6160 Peelable Preservation Basecoat (Material No.PU4-0051) dries.
(f) Let the base coat dry until it loses its gloss.
(g) Apply a 0.002 in. (2 mils) layer of the Z-6148 Water-Borne Preservation Topcoat (Material No.PU4-0050) with the PU10-0060spray equipment, standard.
(h) Remove the masking tape (Material No.PU1-0104) and protective covers that you used for overspray protection.
(i) Do not remove the tape on the exhaust holes, inner surface of the lipskin, outer surface of the lipskin or the hoist point fasteners.
(j) Let the protective coating fully cure. Refer to the instructions of the manufacturer.
(6) Examine the protective coating. Make sure that the protective coating is smooth, uniform and continuous.
(7) Continue with the preservation of the engine, nacelle and aircraft as necessary. Refer to ATA Chapter 10 and 71.
(8) Examine the protective coating every 24 hours for the first seven days.
(a) Make sure that the humidity is stable and there is no excessive moisture on the lipskin.
(9) After the first seven days, refer to ATA Chapter 10 and 71 for more inspection intervals.

5. Close-up
Subtask 71-61-10-440-050-A ** ON A/C NOT FOR ALL

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

Subtask 71-61-10-410-053-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Remove the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE.
(2) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.01 02:33:28 UTC