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Respirator filters and resin vapor odor

Aviation Mechanic General (AMG) practice question 9 of 33 on Aircraft Materials, Hardware, and Processes. ACS element AM.I.E.R1 · difficulty: standard. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONA mechanic working with composite resins takes a break, puts the respirator back on, and can smell resin vapors. What should the mechanic do?

  1. AContinue working; charcoal filters are rated for a full 8-hour shift
  2. BReplace the charcoal filters immediately
  3. CSwitch to a dust mask approved for fiberglass
Show the answer and explanation

Correct answer: B. Replace the charcoal filters immediately

  • A — incorrect Charcoal filters remove vapors only for a period of time, and sometimes they last less than 4 hours; smelling vapors means they are no longer protecting the wearer.
  • B — correct The handbook states that if you can smell the resin vapors when placing the mask back on, the filters must be replaced immediately.
  • C — incorrect A dust mask provides particle protection only; vapor protection from resins requires a respirator with working charcoal filters.

BACKGROUND

Composite products can be very harmful to the skin, eyes, and lungs, and people can become sensitized to the materials. Respirator particle protection guards the lungs from tiny glass bubbles and fiber pieces; at a minimum a dust mask approved for fiberglass is necessary, and a respirator with dust filters is best. When working with resins, vapor protection is needed. Charcoal filters in a respirator remove vapors only for a period of time, sometimes less than 4 hours. If resin vapors can be smelled when the mask is put back on after a break, the filters must be replaced immediately. The respirator should be stored in a sealed bag when not in use.

STUDY TIP

Use the smell test as the trigger: any resin odor through the respirator means the charcoal filters are spent.

KEY POINTS

  • Resin work requires vapor protection, not just a dust mask.
  • Charcoal filters may last less than 4 hours.
  • Smelling resin vapors through the mask means replace the filters immediately.

SOURCES

  • FAA-H-8083-30B ch07 "Composite Safety"
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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.