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STC serial number effectivity

Aviation Mechanic General (AMG) practice question 15 of 37 on Regulations, Maintenance Forms, Records, and Publications. ACS element AM.I.I.K22 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONAccording to the handbook, which document defines a product design change and lists the serial number effectivity of the product to which the modification applies?

  1. AA special airworthiness information bulletin (SAIB)
  2. BA supplemental type certificate (STC)
  3. CAn FAA Form 8130-7 special airworthiness certificate
Show the answer and explanation

Correct answer: B. A supplemental type certificate (STC)

  • A — incorrect An SAIB is a non-regulatory information tool used to alert and make recommendations; it does not define a design change or list effectivity.
  • B — correct The handbook states that the STC defines the product design change, states how it affects the existing type design, and lists serial number effectivity.
  • C — incorrect FAA Form 8130-7 authorizes operation of an aircraft in a special category; it does not define a design modification.

BACKGROUND

A type certificate (TC) is issued by the Federal Aviation Administration (FAA) to signify the airworthiness of an aircraft design, and it may not be changed except by formal FAA authorization. That authorization is the supplemental type certificate (STC), which approves a modification to a product such as an aircraft, engine, or propeller. The Aviation Maintenance Technician Handbook–General explains that the STC defines the product design change, states how the modification affects the existing type design, and lists serial number effectivity. It also identifies the certification basis, which helps applicants evaluate compatibility with other STC modifications. The handbook notes that possessing the STC document does not by itself convey rights to the design data; the technician must contact the STC holder for permission to use it.

STUDY TIP

When a question mentions serial number effectivity of a modification, think of the STC, which is the FAA's approval of a change to a type design.

KEY POINTS

  • An STC is the FAA's formal authorization to change a type design.
  • The STC defines the design change and lists serial number effectivity.
  • Rights to use the STC data must be obtained from the STC holder.

SOURCES

  • FAA-H-8083-30B ch02 "Supplemental Type Certificates (STC)"
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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.