CHAPTER 20
STANDARD PRACTICES
20-10 Cleaning
WARNING
Review appropriate Safety Data Sheet (SDS) when working in
proximity to hazardous materials. Specific recommendations
for use of personal protective equipment are located in the SDS.
A. Cleaning Exterior Surfaces
NOTE
Remove turbine exhaust stains from engine cowling, tailcone,
empennage, and tail rotor blades after every flight to prevent
permanent discoloration.
CAUTION
Refer to § 20-10 Part B for cleaning windshield and windows.
CAUTION
Never use high-pressure spray to clean helicopter. Never blow
compressed air into main or tail rotor blade tip drain holes, pitot
tube, or static ports.
CAUTION
Wash helicopter exterior surfaces with mild soap and water.
Harsh abrasives, alkaline soaps, or detergents can scratch
painted or plastic surfaces, or cause corrosion of metal. Protect
areas where cleaning solution could cause damage.
1. Rinse away loose dirt and debris from exterior surface with clean water.
2. Apply mild soap and clean warm water solution to exterior surface using a clean,
soft cloth, sponge, or soft bristle brush. Use caution near antennas and sensitive
equipment.
3. Remove oil and grease using a cloth wetted with aliphatic naphtha.
4. Rinse all surfaces thoroughly.
5. If desired, polish painted surfaces with a good quality automotive wax using soft
cleaning cloths, or a chamois cloth, free of abrasive debris.
JUL 2020 Chapter 20 Standard Practices Page 20.1
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