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Storing transparent plastic sheets

Aviation Mechanic Airframe (AMA) practice question 27 of 30 on Non-Metallic Structures. ACS element AM.II.B.K24 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic Airframe (AMA) practice mode.

Question bank updated 2026-09-22

QUESTIONHow should flat transparent thermoplastic sheets be stored to prevent buckling?

  1. AFlat on a table with the masking removed
  2. BIn bins tilted 10° from the vertical
  3. CUpright against a heated drying cabinet
Show the answer and explanation

Correct answer: B. In bins tilted 10° from the vertical

  • A — incorrect Masking paper should be left on as long as possible, and horizontal storage risks dirt and chips getting between the sheets.
  • B — correct The handbook directs that plastic sheets be stored with the masking paper in place in bins tilted at a 10° angle from the vertical to prevent buckling.
  • C — incorrect Transparent thermoplastic must be kept in a cool, dry location away from heating coils, radiators, and steam pipes.

BACKGROUND

Transparent thermoplastic sheets soften and deform when heated, so they must be stored where the temperature never becomes excessive, in a cool, dry location away from heating coils, radiators, steam pipes, and paint fumes. Paper-masked sheets are kept out of direct sunlight because sunlight accelerates deterioration of the adhesive and makes the masking difficult to remove. Sheets are stored with the masking paper in place in bins tilted at a 10° angle from the vertical to prevent buckling. Stacks must never exceed 18 inches high, with the smallest sheets on top so there is no unsupported overhang. Formed sections are stored with ample support, kept below 120 °F, and left with their protective coating in place until installed.

STUDY TIP

Commit the specific numbers to memory: a 10° tilt, an 18-inch stack limit, and 120 °F for formed parts.

KEY POINTS

  • Store sheets in bins tilted 10° from the vertical.
  • Leave masking paper in place and keep sheets out of sunlight.
  • Stacks must never exceed 18 inches high.

SOURCES

  • FAA-H-8083-31B ch07 "Transparent Plastics — Storage & Handling"
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MORE ON NON-METALLIC STRUCTURES

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.