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AD number second part

Aviation Mechanic General (AMG) practice question 19 of 37 on Regulations, Maintenance Forms, Records, and Publications. ACS element AM.I.I.K10 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONAn airworthiness directive (AD) number has three parts. According to the handbook, what does the second part of the number identify?

  1. AThe biweekly period when the number was assigned
  2. BThe calendar year of issuance
  3. CThe sequential number of the AD within the calendar year of issuance
Show the answer and explanation

Correct answer: A. The biweekly period when the number was assigned

  • A — correct The handbook states that the second part is the biweekly period of the year in which the AD number was assigned.
  • B — incorrect The calendar year of issuance is the first part of the AD number, not the second.
  • C — incorrect The third part is a sequential number, and it is issued within each biweekly period rather than within the whole year.

BACKGROUND

Airworthiness directives (ADs) are issued by the Federal Aviation Administration (FAA) under 14 CFR part 39 to correct unsafe conditions in aircraft, engines, propellers, and appliances. The Aviation Maintenance Technician Handbook–General explains that ADs carry a three-part number designator. The first part is the calendar year of issuance. The second part is the biweekly period of the year in which the number is assigned. The third part is issued sequentially within each biweekly period. Knowing the structure helps a technician search for and cite ADs correctly when researching a product's compliance status.

STUDY TIP

Read an AD number as year, then biweekly period, then sequence within that period.

KEY POINTS

  • AD numbers have three parts.
  • First part: calendar year of issuance; second part: biweekly period of the year.
  • Third part: sequential number within that biweekly period.

SOURCES

  • FAA-H-8083-30B ch02 "AD Number"
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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.