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Envelope method of re-covering

Aviation Mechanic Airframe (AMA) practice question 6 of 30 on Non-Metallic Structures. ACS element AM.II.B.K12 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic Airframe (AMA) practice mode.

Question bank updated 2026-09-22

QUESTIONWhich statement describes the envelope method of re-covering an aircraft?

  1. APresewn fabric envelopes are slid into position
  2. BFlat fabric blankets are trimmed and glued on one by one
  3. CFabric is wrapped spanwise and shrunk without seams
Show the answer and explanation

Correct answer: A. Presewn fabric envelopes are slid into position

  • A — correct In the envelope method, patterns are made and fabric is cut and stitched so each major surface is covered with a single close-fitting envelope that is slid into place and cemented.
  • B — incorrect Attaching multiple trimmed flat sections describes the blanket method, which is the alternative to the envelope method.
  • C — incorrect Spanwise wrapping without seams is not one of the two accepted covering methods described in the handbook.

BACKGROUND

Either the envelope method or the blanket method of fabric covering is acceptable, but the choice must be made before re-covering begins. In the blanket method, multiple flat sections of fabric are trimmed and attached to the airframe, with the layout worked out individually for each aircraft. The envelope method saves time by using precut and presewn envelopes, cut and stitched from patterns so that each major surface can be covered with a single close-fitting envelope. The envelopes are slid into position, oriented with the seams in the proper place, and attached with adhesive. Envelope seams are usually located over airframe structure in inconspicuous places such as trailing edges and the top and bottom of the fuselage.

STUDY TIP

Learn the two covering methods as a contrasting pair, and remember that the choice between them is made before work starts, not partway through.

KEY POINTS

  • Envelope method uses precut, presewn fabric envelopes.
  • Blanket method uses multiple trimmed flat sections.
  • Either method is acceptable, but choose before starting.

SOURCES

  • FAA-H-8083-31B ch03 "Blanket Method vs. Envelope Method"
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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.