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100-hour inspection due after discontinuing a progressive program

Aviation Mechanic General (AMG) practice question 6 of 21 on Inspection Concepts and Techniques. ACS element AM.I.K.K4 · difficulty: applied. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONAn operator discontinues a progressive inspection program. The last complete inspection of the aircraft under that program was accomplished at 2,340.0 hours total time. Within what total time is the 100-hour inspection under § 91.409(b) then due?

  1. A2,350.0 hours
  2. B2,540.0 hours, based on a 200-hour allowance
  3. C2,440.0 hours
Show the answer and explanation

Correct answer: C. 2,440.0 hours

  • A — incorrect Ten hours is the en-route overflight allowance for a 100-hour inspection, not the interval that starts after discontinuing a progressive program.
  • B — incorrect No 200-hour allowance exists; the 100-hour inspection is due within 100 hours after the last complete inspection.
  • C — correct After discontinuance, the 100-hour inspection is due within 100 hours after the last complete inspection under the progressive program; 2,340.0 plus 100.0 equals 2,440.0 hours.

BACKGROUND

Section 91.409(d) provides that if a progressive inspection is discontinued, the owner or operator must immediately notify the local FSDO in writing. After the discontinuance, the first annual inspection under § 91.409(a)(1) is due within 12 calendar months after the last complete inspection of the aircraft under the progressive program, and the 100-hour inspection under § 91.409(b) is due within 100 hours after that complete inspection. A complete inspection for this purpose requires a detailed inspection of the aircraft and all its components in accordance with the progressive inspection; a routine inspection plus a detailed inspection of only several components does not qualify.

STUDY TIP

Anchor both clocks to the last complete inspection under the progressive program: 12 calendar months for the annual and 100 hours for the 100-hour inspection.

KEY POINTS

  • Discontinuance requires immediate written notice to the FSDO.
  • The next annual is due within 12 calendar months after the last complete inspection.
  • The next 100-hour inspection is due within 100 hours after that complete inspection.

SOURCES

  • FAA-H-8083-30B ch10 Figure 10-3 (14 CFR 91.409(d))
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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.