2.  
With top cowling removed, disconnect bleed air line at union below T-connection. Secure cap lines.

3.  
Close bleed air shutoff valve and install ground run cowl. Disconnect and cap HI and LO stage bleedlines. Do not wash engine with bleed mixing valve connected to bleed lines as valve control passageways become plugged or fouled, rendering valve inoperative and uncontrollable.

4.  
Open access door on side of bottom cowl; clean mechanism attached to wash ring fitting and clean according to Pratt & Whitney Maintenance Manual.

5.  
Soak for about 15 minutes after wash.

C.  Field Cleaning Engine
Field cleaning consists of internal washing of engine compressor and external washing of engine. Refer to Pratt & Whitney Maintenance Manual, P/N 3034342, Chapter 71, for approved procedures and precautions.
EFFECTIVITY:
040-999  12-00-00 Jan
10 /90
12-00-00

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL

D. Aircraft Finish Care
1. Cleaning
WARNING: DO NOT USE GASOLINE, KEROSENE, ALCOHOL, BENZENE, CARBON TETRACHLORIDE,THINNER, ACETONE OR WINDOW CLEANING SPRAYS TO CLEAN AIRPLANE.
The entire airplane is carefully finished inside and out to assure maximum service life. All parts are alodine treated and sprayed with zinc chromate primer on both sides. The external surfaces are coated with durable polyurethane enamel.
2. CleaningExteriorSurfaces
The airplane should be washed with a mild soap and water solution. Harsh abrasives or alkaline soaps or detergents could scratch painted or plastic surfaces or corrode metal. Cover areas where a cleaning solution could cause damage. To wash the airplane use the following procedure:
(a)
Flush away loose dirt with water.

(b)
Apply cleaning solution with a soft cloth, a sponge or a soft brush.

(c)
To remove exhaust stains, allow the solution to remain on the surface longer.

(d)
To remove stubborn oil and grease stains, use a soft cloth dampened with naphtha.

(e)
Rinse all surfaces thoroughly.

(f)
Any good automotive wax may be used to protect and preserve painted surfaces. Soft cleaning cloths or a chamois should be used to prevent scratches when cleaning or polishing. A heavier coat of wax on leading surfaces will reduce the abrasion problems in these areas. Refer to surface de-ice cleaning procedures.

3. Cleaning Windshield and Windows
CAUTION: USE ONLY WATER AND MILD SOAP WHEN CLEANING THE HEATED WINDSHIELD. USE OF ANY OTHER CLEANING AGENT OR MATERIAL MAY CAUSE DISTORTION OR DAMAGE TO WINDSHIELD COATINGS.
(a)
Remove dirt, mud and other loose particles from exterior surfaces with clean water.

(b)
Wash interior and exterior window surfaces with mild soap and warm water. Use a soft cloth or sponge in a straight back and forth motion. Do not rub harshly.

(c)
Remove oil and grease with a cloth dampened with Plexiglas Polish and Cleaner, P/N 403D or similar substance conforming to Federal Specification (P-P-560) or kerosene.

(d)
Rinsewindows thoroughly and dry with soft lint-free cloth.

WARNING: DO NOT USE GASOLINE, ALCOHOL, BENZENE, CARBON TETRACHLORIDE, THINNER, ACETONE, STRONG SOLVENTS OR WINDOW CLEANING SPRAYS.DO NOT USE PLASTIC CLEANER ON HEATED GLASS WINDSHIELDS.

(e)
A superficial scratchor mar in plastic can be removed by polishing out the scratch with jeweler'srouge.

(f)
Whenwindows are clean, apply a thin coat of polishing wax. Rub lightly with a soft cloth. Do not apply wax to heated windshields with electrical heating elements.

(g)
Apply REPCON repellent or equivalent to windows and windshield to improve visibility during flights through rain. Apply only according to manufacturer's instructions. (Refer to 91-00-00, ConsumableMaterials.)

EFFECTIVITY:
040-999

Jan 10/90 12-00-00
PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

D. AircraftFinishCare(continued)
4. CleaningInterior
(a)
Vinylinteriorsurfaces may be cleaned with a damp cloth and mild soap and water solution.

(b)
Leathermay be cleanedwith a mild hand soap and water solutionor with a saddle soap. Followthe precautions which apply to the cleaning of any fine leather product. Avoidsaturation and never use detergents or harsh cleaning solutions on leather.

CAUTION: USEOF COMMON HOUSEHOLDCLEANERS AND POLISHESON WOOD LAMINATEDSURFACESCOULDBEVERY HARMFUL.
(c)
Wood laminated surfacesshould be maintainedusing only a high gradefurniturewax.

(d)
Allupholsteryfabrics are Scotchguard treatedand may be cleaned as follows:
　
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