Cleaning and Paint Removal

This section describes the removal of surface deposits by use of a chemical cleaning agent. The chemical agent dissolves or loosens the deposit, which is washed or rinsed away after a soaking period. Also included is power flushing with a chemical agent.

This section also describes the use of a brush, fell bob, sandpaper or other hand (or machine) action to remove surface deposits (eg, removal of paint or coatings by any authorized mechanical process).

Preliminary Requirements

Consumables, Materials and Expendables

Dry cleaning solvent

Methyl-Ethyl-Ketone (MEK)

Abrasive pad

Paint remover

Vapor degreaser

Main Procedures

1. Clean all main rotor hub parts with dry cleaning solvent.

Blade Bolt Cleaning

MAKE SURE YOU DON’T EXCEED THE MAXIMUM TEMPERATURE WHEN YOU HEAT THE PART OR DAMAGE TO THE PART MAY OCCUR.

1. Heat the blade bolts and the plugs to a maximum of 200°F (93°C).

2. Remove adhesive from the blade bolts and plugs using a plastic scrapper.

3. Clean the surfaces with MEK.

Blade Grip Cleaning

1. Vapor degrease grip using vapor degreaser at 188 to 193°F (87 to 89°C) and Abrasive pad.
2. After cleaning, apply a film of water to surface and check for break free surface.

3. If a “break” occurs within 25 seconds after water flow stops, repeat cleaning and retest.

Drying Procedures

DO NOT SPIN BEARINGS WHILE AIR DRYING.

1. Dry parts with filtered, compressed air and clean, lint-free cloths.

Paint Removal

1. Strip paint from components as required using paint remover.