Instruction Manual

Instructions for Continued Airworthiness 190-00792-12 Rev 1
for the Garmin G500H Installation in Eurocopter AS350 Page 40 of 80
Section 20-90-00 Dye Penetrant Inspection Methods
Warning: solvents can cause burns and irritation when it contacts skin; proper gloves
should be worn. Vapors are harmful and caustic to eyes; Goggles must be worn for eye
protection. Vapors are harmful to life or health; work should be performed with proper
ventilation and / or respirators should be worn while working with Solvents. Solvent
cleaners are flammable.
Use the following steps to perform dye penetrant inspection:
1. Using cleaning solvent trichloroethane, MIL-T-81533, clean area to be inspected.
Note: Parts to be inspected must be dry and heated to at least 70° F (21.1° C), but not over
130° F (54.4° C).
Note: Manufacturers instructions on Dye Penetrant Kit take precedence over the following
instructions.
2. Apply penetrant from dye penetrant kit, MIL-25135, by brushing, spraying, or by dipping.
Allow to stand for a minimum of 2 minutes.
3. Remove excess penetrant with remover (available with dye penetrant kit), or by cleaning
with plain water. Allow part to dry.
4. Apply a light even layer of developer from dye penetrant kit by brushing, spraying, or by
dipping. When dipping, avoid excess quantity.
5. Penetrant, which has penetrated into cracks (or other openings) in the surface of the part
will be drawn out by the developer resulting in a bright red indication.
6. If part is serviceable or repairable, clean part free of penetrant and developer with
trichloroethane, MIL-T-81533 cleaning solvent
20-90-00