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High-pressure water in the wet wash method

Aviation Mechanic General (AMG) practice question 20 of 31 on Cleaning and Corrosion Control. ACS element AM.I.G.K10 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONIn the wet wash method of exterior cleaning, for what purpose is high-pressure running water used?

  1. AAs a rinse after the cleaning compound is applied
  2. BTo apply the alkaline or emulsion cleaning compound to the surface
  3. CTo remove corrosion and oxide films from the skin
Show the answer and explanation

Correct answer: A. As a rinse after the cleaning compound is applied

  • A — correct In wet wash the cleaning compounds are applied by spray or mop, and then high-pressure running water is used as a rinse.
  • B — incorrect The compounds are applied by spray or mop; the high-pressure water comes afterward as the rinse.
  • C — incorrect Wet wash removes oil, grease, carbon, and most soils, but specifically not corrosion or oxide films.

BACKGROUND

Wet wash removes oil, grease, carbon deposits, and most soils, with the exception of corrosion and oxide films. The cleaning compounds, either alkaline or emulsion types, are generally applied by spray or mop, and high-pressure running water is then used as a rinse. Elsewhere the handbook prescribes a low to medium pressure water stream for rinsing paint stripper residue, and a fresh-water rinse under pressure for 10 to 15 seconds in the alodizing process, so the pressure used depends on the operation.

STUDY TIP

Note where the handbook specifies water pressure: high pressure for the wet wash rinse, low to medium pressure when rinsing stripped areas.

KEY POINTS

  • Wet wash: compound by spray or mop, then high-pressure water rinse
  • Wet wash does not remove corrosion or oxide films
  • Stripper residue is rinsed with a low to medium pressure stream

SOURCES

  • FAA-H-8083-30B ch08 "Exterior Cleaning"
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MORE ON CLEANING AND CORROSION CONTROL

SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-30B Aviation Maintenance Technician Handbook – General, 14 CFR part 43 and part 65. Regulations and handbooks are revised; confirm details against the current edition.