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Rights conveyed by an STC document

Aviation Mechanic General (AMG) practice question 22 of 37 on Regulations, Maintenance Forms, Records, and Publications. ACS element AM.I.I.K13 · difficulty: standard. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONA mechanic obtains a copy of a supplemental type certificate (STC) document. According to FAA-H-8083-30B, what does possession of that document give the mechanic?

  1. AThe right to install the modification on any listed serial number
  2. BOwnership of the supporting drawings and instructions
  3. CNo rights to the design data or to install the modification
Show the answer and explanation

Correct answer: C. No rights to the design data or to install the modification

  • A — incorrect Serial number effectivity defines which products the STC covers, but installation rights must be obtained from the STC holder, not from possessing the document.
  • B — incorrect The supporting drawings, instructions, and specifications remain the property of the STC holder.
  • C — correct The handbook states that possession of the STC document does not constitute rights to the design data or installation of the modification; the STC and its supporting data are the property of the STC holder.

BACKGROUND

A supplemental type certificate (STC) is the FAA's formal authorization for a change to a type design; it approves a product modification, defines the design change, states how it affects the existing type design, and lists serial number effectivity. FAA-H-8083-30B chapter 2 cautions that possession of the STC document does not constitute rights to the design data or to installation of the modification. The STC and its supporting data, such as drawings, instructions, and specifications, are the property of the STC holder, and a person must contact the STC holder to obtain rights to use the STC. The sample STC in the handbook likewise states that the holder must give written evidence of permission to another person who uses the certificate to alter a product.

STUDY TIP

Separate two ideas: the STC as approved data (which you may cite) and the right to use the STC (which only the holder can grant).

KEY POINTS

  • An STC approves a modification to a type-certificated product.
  • Having a copy of the STC gives no rights to the design data or installation.
  • Rights to use an STC must be obtained from the STC holder.

SOURCES

  • FAA-H-8083-30B ch02 "Supplemental Type Certificates (STC)" and the paragraph following Figure 2-15
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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.