TM 1-1520-238-23
Change 4
1-165
1.53.
AIRCRAFT AND AIRCRAFT COMPONENT WASHING, CLEANING, AND FRESH WATER RINSE
PROCEDURES – continued
1.53.3. General Cleaning/Washing Procedures
CAUTION
Use of high pressure wash on any part of this aircraft is prohibited.
Do not rinse aircraft with a solid stream of water. Use a soft spray pattern to avoid damage and water
intrusion.
Water must not be directed at pitot tubes, static ports, gearboxes, fillers, and vents, etc. Critical
areas shall be adequately protected (ground plugs, covers, etc.).
Use low water flow pressure to avoid forcing water past static and dynamic seals. Avoid water
intrusion into light fixtures, electrical components, antennas, etc.
Washing of main rotor or tail rotor head requires a reapplication of corrosion preventive compound
(item 63, App F) to designated areas.
Use appropriate water flow and media which will not lead to scratching of the transparent sections
of the canopy.
a. Use a soft flow or spray pattern to dissolve, dislodge, and flush away visible salt encrustation as well
as rinse the external surfaces. A recommended flow of eight gallons per minute at approximately 25 PSI
supply pressure is recommended.
b. Direct water at an angle of 15 to 30 degrees from the surface. Ensure that sufficient water flow is achieved
on all surfaces.
c. Rinsing sequence.
NOTE
Preposition blades at approximately 45 degrees relationship to fuselage longitudinal center line to
minimize water drainage into the main transmission deck area.
(1) Main rotor blades.
(2) Main rotor head (to include strap pack accessible areas).
(3) Main rotor fairing.
(4) Left side of center fuselage, left nacelle, and wing.
(5) Canopy and forward fuselage (top and sides).
(6) Right side of center fuselage, right nacelle, and wing.
(7) Forward and center fuselage belly.
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