MAINTENANCE MANUAL
UNSCHEDULED SERVICING — MAINTENANCE PRACTICES
1. Aircraft Storage
A. Preparation
(1) References
• Mandatory Precautions - Maintenance Practices, 20-00-05, Maintenance Practices
• GARRET Service Manual.
(2) Aircraft Preparation
(a) Prepare aircraft for safe ground maintenance. See Mandatory Precautions -
Maintenance Practices, 20-00-05, Maintenance Practices.
B. Procedure
(1) Methods used for extended storage of aircraft will depend on climatic conditions and facilities
at storage location.
(2) Storage of aircraft for 21 days or less does not require storage methods. However, engine
ground run and functional check of all aircraft systems should be performed every 7 days.
(3) If aircraft is located in area where salt air is prevalent, it should be washed and waxed before
being placed in storage.
(4) When aircraft is parked in hot sun, windshield and flight compartment windows should be
covered to prevent heat damage to avionics and instruments.
(5) For engine storage instructions, refer to GARRET Service Manual.
C. Follow On
(1) Inspect for presence of foreign objects.
(2) Record all maintenance actions in accordance with current governing authority.
2. Aircraft Interior — Cleaning
A. Preparation
SPECIAL TOOLS AND TEST EQUIPMENT
Vacuum cleaner .................................................................................................................. Standard
Approved leather and vinyl cleaner .................................................................................... Standard
Lint free cloth ...................................................................................................................... Standard
CONSUMABLES
Mild soap ............................................................................................................................. Standard
Water ................................................................................................................................... Standard
(1) References
• Mandatory Precautions - Maintenance Practices, 20-00-05, Maintenance Practices
(2) Aircraft Preparation
(a) Prepare aircraft for safe ground maintenance. See Mandatory Precautions -
Maintenance Practices, 20-00-05, Maintenance Practices.
B. Procedure
(1) Seats, carpets, upholstered side panels and overhead panels should be vacuumed frequently
to remove as much surface dust and dirt as possible. Do not use water to clean fabric
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surfaces as water will spot surface and remove flame resistant chemical contained in cloth.
(2) Plastic trimmings may be cleaned with approved leather and vinyl cleaner.
(3) Wood panelling should be cleaned with mild soap and water and lint free cloth.
C. Follow On
(1) Inspect for presence of foreign objects.
(2) Record all maintenance actions in accordance with current governing authority.
3. Aircraft Exterior — Cleaning
NOTE: Pressure washing of aircraft is not recommended due to the adverse effects on aircraft
components. The high velocity water and cleaning agents can force dirt, contamination and
moisture into bearings, bushed joints, actuator seals, electrical components, faying surfaces and
structural joints resulting in increased maintenance costs and unserviceability.
A. Preparation
SPECIAL TOOLS AND TEST EQUIPMENT
Chamois .............................................................................................................................. Standard
Brush ................................................................................................................................... Standard
CONSUMABLES
Naphtha or Kerosene, Hexane or White Gasoline ............................................................. Standard
Cleaning compound ............................................................................................................ Standard
Emulsifying agent ................................................................................................................ Standard
Soap .................................................................................................................................... Standard
Glycerin ............................................................................................................................... Standard
Hydraulic fluid ................................................................................................................. MIL-H-5606
Lint free cloth ...................................................................................................................... Standard
Windshield cleaner .............................................................................................................. Standard
Tire paint ................................................................................................................................ Thiokol
Aircraft engine corrosion preventive, concentrate compound ........................... MIL-C-6529, Type I
(1) Reference
• Mandatory Precautions - Maintenance Practices, 20-00-05, Maintenance Practices
(2) Aircraft Preparation
(a) Prepare aircraft for safe ground maintenance. See Mandatory Precautions -
Maintenance Practices, 20-00-05, Maintenance Practices.
(b) Prior to cleaning exterior, cover wheels and ensure brake discs are covered.
(c) Cover all bearings of hinged flight control surfaces to prevent lubrication being washed
out by wash water applied under pressure.
(d) Attach pitot covers securely and install plugs or mask off all other openings. Be
particularly careful to mask off all static ports before washing.
(e) Be particularly careful to mask off all static air ports before washing or waxing.
(f) Cover all bearings of flight control surface hinges to prevent lubrication being washed
out by water applied under pressure.
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B. Procedure
(1) Do not apply wax or polish for a period of 60 to 90 days after delivery. This will give paint a
chance to cure by natural process of oxidation. Waxes and polishes seal paint from air and
prevent curing. If it is necessary to clean painted surface before expiration of 90-day curing
period, use cold or lukewarm (never hot) water and mild soap. Never use detergents. Any
rubbing of painted surface should be done gently and held to minimum to avoid cracking paint
film.
(2) To wash aircraft, first flush with mild soap and water. Harsh or abrasive soaps or detergents
will cause corrosion and make scratches. Soft cleaning cloths or a chamois should be used to
prevent scratches when cleaning and polishing.
(3) To remove stubborn oil and grease, use a cloth dampened with naphtha or kerosene.
(4) Windshield and Window Cleaning
(a) Windshield and windows should be cleaned with cleaner specially manufactured for
this purpose.
CAUTION: HARD ROUGH CLOTHS OR PAPER WILL SCRATCH THE ACRYLIC
WINDOWS.
(b) When cleaner is not available, windshield and windows may be cleaned with detergent
and water using bare hand to dislodge dirt and mud. Dry with clean damp chamois.
(c) For interior, where water cannot be used freely, acrylic windows should first be dusted
very lightly (not wiped) with soft clean cloth. Surface can then be wiped with wet cloth
or chamois free of grit by frequently rinsing in clear water.
CAUTION: DO NOT USE SOLVENTS SUCH AS ACETONE, BENZENE, CARBON
TETRACHLORIDE, DRY CLEANING FLUID OR LACQUER THINNERS.
DO NOT USE WINDOW/SPRAYS OR SCOURING COMPOUNDS.
(d) Grease and oil may be removed with hexane, kerosene, white gasoline (do not use
aviation or ethyl gasoline) or nonaromatic aliphatic naphtha.
(5) Landing Gear and Wheel Wells
(a) Use cleaning compound containing emulsifying agent to remove oil, grease and
surface dirt from landing gear and wheel well. These compounds, when mixed with
petroleum solvents, emulsify oil, grease and dirt. Emulsion is then removed by rinsing
with water or by spraying with petroleum base solvent.
(b) After cleaning, completely lubricate landing gear, Ensure to cover all openings and air
scoops before cleaning.
(c) If water rinse is used in cold weather, blow all water from wheel well with an air hose.
Water allowed to stand may freeze and lock gear or gear doors. Emulsion cleaner
solutions usually contain solvents, which are injurious to rubber if allowed to remain in
contact for any length of time.
(d) If these solvents come in contact with tires as a result of other cleaning operations,
solvent should be removed immediately with a water rinse. To clean tires, rinse with
water and scrub with brush.
(e) Tires may be brightened after washing by rubbing with glycerin or applying brush coat
of Thiokol tire paint.
(f) After cleaning landing gear, remove all foreign material from exposed piston of landing
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gear shock strut with lint free cloth moistened with MIL-H-5606 hydraulic fluid.
(6) Aircraft operated in salt atmosphere or airstrips treated with salt.
(a) Since corrosion damage may result before chemical cleaning (wash) a program should
be determined by each individual operator since environmental conditions vary widely
among operators.
(b) Wash aircraft, which are operated over salt water with fresh water after each days flight
to prevent corrosion caused by sea air and salt spray. Remove all traces of salt water
or salt residue.
CAUTION: TO PREVENT DAMAGE TO ELECTRONIC COMPONENTS, MAKE
SURE THAT NOSE CANOPY AND VENT OPENINGS ARE SECURED
AND COVERED BEFORE WASHING THE AIRCRAFT.
(c) After drying, coat unpainted or unprotected parts by rubbing lightly with aircraft engine
corrosion preventive.
(d) Apply this compound to parts which move or require some lubrication and on all fittings
subject to corrosion such as landing gear, retracting plungers, control surfaces hinges,
control cables, exposed rivets and bolts and other similar parts not protected by paint.
Apply with a cloth or soft brush soaked in compound.
(e) Wipe off excess compound. When applying corrosion preventive compound, ensure as
little as possible is deposited on exhaust pipe to avoid fire hazard when engine is
started. Keep ignition wires; deice boots, tires and other rubber parts free of this
compound.
C. Follow On
(1) Inspect for presence of foreign objects.
(2) Record all maintenance actions in accordance with current governing authority.
4. Aircraft Painting
NOTE: Do not use aluminum foil as a paint spray mask for the windshield. Metal brightness, which are
commonly used to prepare aircraft surface for painting, react with aluminum and release
hydrogen. This is damaging to the NESA film used on the windshields, for protection from static
electricity. The hydrogen released the chemical reaction between skin brightness and aluminum
foil mixed with the NESA film is basically tin oxide, and causes discoloration of the glass. For this
reason paper or cardboard only should be used to protect the windshield when painting the
aircraft.
A. Preparation
(1) Reference
• Mandatory Precautions - Maintenance Practices, 20-00-05, Maintenance Practices
(2) Aircraft Preparation
(a) Prepare aircraft for safe ground maintenance. See Mandatory Precautions -
Maintenance Practices, 20-00-05, Maintenance Practices.
B. Procedure
(1) Refer to FAA Advisory Circulars AC 43.13-1 for paint surface preparation and application and
manufacturers application instructions.
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C. Follow On
(1) Inspect for presence of foreign objects.
(2) Record all maintenance actions in accordance with current governing authority.
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