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Respiratory protection for phosphate ester fluid mist

Aviation Mechanic Airframe (AMA) practice question 13 of 15 on Hydraulic and Pneumatic Systems. ACS element AM.II.F.R2 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic Airframe (AMA) practice mode.

Question bank updated 2026-09-22

QUESTIONWhen exposure to phosphate ester-based fluid mist or vapor is possible, what protection must be worn?

  1. Aa dust mask together with a full face shield
  2. Bgloves and eye protection only
  3. Ca respirator for organic vapors and mists
Show the answer and explanation

Correct answer: C. a respirator for organic vapors and mists

  • A — incorrect A dust mask does not remove organic vapors, so it does not meet the stated requirement for mist and vapor exposure.
  • B — incorrect Gloves and eye protection are always required when handling hydraulic fluid, but they do not address inhalation of mist or vapor.
  • C — correct When phosphate ester-based mist or vapor exposure is possible, a respirator capable of removing organic vapors and mists must be worn.

BACKGROUND

Some phosphate ester-based fluids are blended with performance additives, and phosphate esters are good solvents that dissolve away some of the fatty materials of the skin. Repeated or prolonged exposure may cause drying of the skin, which if unattended could result in complications such as dermatitis or even secondary infection from bacteria. Proper gloves and eye protection must always be used when handling any type of hydraulic fluid, and when phosphate ester-based mist or vapor exposure is possible, a respirator capable of removing organic vapors and mists must be worn. Ingestion of any hydraulic fluid should be avoided, and any significant amount should be tested in accordance with the manufacturer's direction followed by hospital supervised stomach treatment.

STUDY TIP

Match the protective equipment to the route of exposure: skin and eyes call for gloves and eye protection, airborne mist calls for an organic vapor respirator.

KEY POINTS

  • Gloves and eye protection are required whenever hydraulic fluid is handled.
  • Possible mist or vapor exposure adds a respirator that removes organic vapors and mists.
  • Repeated skin contact with phosphate ester fluid can dry the skin and lead to dermatitis.

SOURCES

  • sources/ama-airframe/ch12.txt "Health & Handling"
Practice the Aviation Mechanic Airframe (AMA) test →Timed 100-question exam, by ACS area, or review your misses. Free.
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SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-31B Aviation Maintenance Technician Handbook – Airframe, and 14 CFR part 43. Regulations and handbooks are revised; confirm details against the current edition.