Inspection and Cleaning of the Nacelle (After Exposure to Volcanic Ash/Sand) [PW11]

TASK 71-00-00-200-807-A
Inspection and Cleaning of the Nacelle (After Exposure to Volcanic Ash/Sand)

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 information about the inspection of the nacelle:

After a flight in volcanic ash conditions, or,
After volcanic ash contamination when the aircraft was on the ground.

Inspections after a flight through volcanic ash, after volcanic sulfur odor or after volcanic ash contamination on the ground, refer to AMM task 05-51-25-200-003.
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	AR	VACUUM CLEANER

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0001)	cloth
(Material No.PU1-0051)	water
(Material No.PU2-0001)	alcohol, isopropyl

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 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 71-13-00-200-802-A	General Visual Inspection of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 71-61-10-210-801-A	General Visual Inspection of the Inlet Cowl
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 78-32-00-210-803-A	General Visual Inspection of the Thrust Reverser
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
TASK 71-13-00-00-21	FAN COWL DOORS - DESCRIPTION AND OPERATION
TASK 78-11-00-00-21	TURBINE EXHAUST SYSTEM - DESCRIPTION AND OPERATION
TASK 78-31-00-00-21	THRUST REVERSER (T/R) CONTROL AND INDICATING - DESCRIPTION AND OPERATION
TASK 78-32-00-00-21	THRUST REVERSER HALVES - DESCRIPTION AND OPERATION
TASK 78-37-00-00-21	THRUST REVERSER TERTIARY LOCKING SYSTEM - DESCRIPTION AND OPERATION

3. Job Set-up
Subtask 71-00-00-941-172-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 71-00-00-010-220-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 2M (6 FT) - ADJUSTABLE in position.

Subtask 71-00-00-040-118-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 71-00-00-010-221-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 71-00-00-210-119-A ** ON A/C NOT FOR ALL

A. Inspection and Cleaning of the Nacelle (after Exposure to Volcanic Ash/Sand)
(1) Do not discard a part until you are sure there are no repairs available. If you reject a part and no repair is available, contact Collins Aerospace for disposition.
(2) Examine all the inlet cowl components for ash contamination (Ref. AMM TASK 71-61-10-210-801):
(a) Carefully, examine the inlet cowl components as follows:
For more information on the inlet cowl components (Ref. AMM TASK 71-61-10-210-801).

Inspection of the Nacelle	Method	Instructions	Disposition
Lip skin Leading Edge (LE)	Visual	Examine for ash accretion, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Scoop	Visual	Examine for ash accretion, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Nacelle Anti-Icing (NAI) ventilation holes	Visual	Examine for ash deposits, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Outer barrel	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Inner barrel	Visual	Examine for ash deposits, blockage of acoustic treatment	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Hole and surrounding area of T2 probe	Visual	Examine for ash contamination	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Cover receptacles	Visual	Examine for ash contamination	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).

Table - Inspection of the Nacelle - Inlet Cowl (for Ash Contamination)

(3) Examine all the fan cowl door components for ash contamination (Ref. AMM TASK 71-13-00-200-802):
(a) Carefully, examine the fan cowl door components as follows:
For more information on the fan cowl door components (Ref. AMM D/O 71-13-00-00).

Inspection of the Nacelle	Method	Instructions	Disposition
Strakes	Visual	Examine for ash deposits, ash accretion, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Oil tank access door and latches	Visual	Examine for ash accretion, erosion around component	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Ventilation plates	Visual	Examine for ash accretion, erosion around component	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Proximity sensors and surrounding areas	Visual	Examine for ash accretion, erosion around component	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7). Do a functional check.
Fan cowl interfaces (with inlet cowl and thrust reverser)	Visual	Examine for ash deposits, ash accretion, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Fan cowl LE	Visual	Examine for ash deposits, ash accretion, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Hold Open Rods (HOR)	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7). Do a functional check.
Fan cowl hinges and attaching hardware	Visual	Examine for ash deposits, ash accretion, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Latches	Visual	Examine for ash deposits, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7). Do a functional check.

Table - Inspection of the Nacelle - Fan Cowl (for Ash Contamination)

(4) Examine all the thrust reverser components for ash contamination (Ref. AMM TASK 78-32-00-210-803):
(a) Carefully, examine the thrust reverser components as follows:
For more information on the thrust reverser components (Ref. AMM D/O 78-32-00-00) and (Ref. AMM D/O 78-37-00-00).

Inspection of the Nacelle	Method	Instructions	Disposition
Thrust reverser interfaces (with pylon and fan cowl)	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Thrust reverser LE	Visual	Examine for ash accretion, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Translating sleeve LE	Visual	Examine for ash accretion, erosion, dents	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Translating sleeve and outer fixed structure	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Fan duct	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Perforations of the acoustic panels	Visual	Examine for blockage	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Primary and auxiliary slider tracks	Visual	Examine for ash contamination, blockage	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Cascades	Visual	Examine for ash accretion, erosion, blockage	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Cascade vanes and strong backs	Visual	Examine for damage	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Blocker doors	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Blocker door hinges	Visual	Examine for ash contamination	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Perforations on the acoustic blocker doors	Visual	Examine for blockage	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Drag links	Visual	Examine for ash accretion, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Drag link lugs and clevises	Visual	Examine for ash contamination	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Pre-cooler scoop	Visual	Examine for ash accretion, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Active Clearance Control (ACC) scoop	Visual	Examine for ash accretion, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Air Cooled Oil Cooler (ACOC) scoop	Visual	Examine for ash accretion, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Core zone vents	Visual	Examine for ash accretion, erosion, blockage	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Seals and seal ventilation holes	Visual	Examine for ash accretion, blockage	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Thermal blankets	Visual	Examine for ash accretion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Starter Air Valve (SAV) flapper door assembly	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
NAI access ports	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
V-blade	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Track lock system	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).
Door Opening System (DOS)	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7). Do a functional check.
HORs	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7). Do a functional check.
Latches and bifurcation latch	Visual	Examine for ash deposits, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7). Do a functional check.
Pressure relief door latches	Visual	Examine for ash deposits, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7). Do a functional check.

Table - Inspection of the Nacelle - Thrust Reverser (for Ash Contamination)

(b) Carefully, examine the Thrust Reverser Actuation System (TRAS) components as follows:
For more information on the TRAS components (Ref. AMM D/O 78-31-00-00).

Inspection of the TRAS	Method	Instructions	Disposition
TRAS Locking actuator rod ends and manual unlock features Locking feedback actuator rod ends and manual unlock features Track lock blade, manual unlock features and surrounding areas Hydraulic Control Unit (HCU) pressure switches	Visual	Examine for ash deposits	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7). Do a functional check.

Table - Inspection of the Nacelle - TRAS (for Ash Contamination)

(5) Examine the engine build-up as follows:
(a) Visually examine the engine build-up systems.

Inspection of the Nacelle	Method	Instructions	Disposition
NAI system NAI valves Solenoid manifold Sense lines Pressure transducers Hot air discharge ports on the NAI valves Hot air discharge ports on the solenoid manifold	Visual and functional check	Examine for ash contamination, blockage	If you find unsatisfactory operation of system, replace the part(s).
Environmental Control System (ECS) Sense lines Ball joints of the ducts	Visual and functional check	Examine for ash contamination	If you find unsatisfactory operation of system, replace the part(s).
Drain mast	Visual	Examine for ash deposits, erosion	Vacuum, clean with solvent and rinse with demineralized water.

Table - Inspection of the Nacelle - Engine Build-up (for Ash Contamination)

(6) Examine the exhaust as follows:
(a) Visually examine the exhaust for ash contamination:
For more information on the exhaust components (Ref. AMM D/O 78-11-00-00).

Inspection of the Nacelle	Method	Instructions	Disposition
Flow surfaces	Visual	Examine for abrasion, erosion	Vacuum, clean with solvent and rinse with demineralized water. Refer to Step 4.A.(7).

Table - Inspection of the Nacelle - Exhaust (for Ash Contamination)

(7) Remove the volcanic ash contamination from the components as follows:
(a) Remove the ash contamination from the applicable components and surrounding areas with the VACUUM CLEANER.
(b) Clean the components with a clean cloth (Material No.PU1-0001) and PU2-0001alcohol, isopropyl. Remove the solvent with a clean cloth (Material No.PU1-0001) before it dries.
(c) Flush the components with water (Material No.PU1-0051) .
(d) Dry the components with a clean cloth (Material No.PU1-0001) .
(8) Examine the components again:
(a) Refer to Step 4.A.(2) thru Step 4.A.(6)(a).
(9) If necessary, do a functional check for the applicable components and systems:
(a) Refer to Step 4.A.(2) thru Step 4.A.(6)(a).

5. Close-up
Subtask 71-00-00-410-202-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-doors (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 71-00-00-440-110-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 71-00-00-410-203-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 02:31:48 UTC