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Three types of human error

Aviation Mechanic General (AMG) practice question 8 of 16 on Human Factors. ACS element AM.I.L.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

QUESTIONFAA-H-8083-30B lists three types of human error. Performing a task that is not authorized is which type?

  1. AAn error of commission
  2. BAn extraneous error
  3. CAn error of omission
Show the answer and explanation

Correct answer: B. An extraneous error

  • A — incorrect Commission is accomplishing a task incorrectly, not performing an unauthorized task.
  • B — correct The handbook defines an extraneous error as performing a task not authorized.
  • C — incorrect Omission is not performing an act or task at all.

BACKGROUND

The introduction to the human factors chapter of FAA-H-8083-30B defines human error as the unintentional act of performing a task incorrectly that can potentially degrade the system. It identifies three types of human error: omission, which is not performing an act or task; commission, which is accomplishing a task incorrectly; and extraneous, which is performing a task not authorized. The handbook also lists four consequences of human error: little or no effect, damage to equipment or hardware, personal injury, and catastrophic.

STUDY TIP

Memorize the three error types with their one-line definitions and the four consequences. The distinction between commission (done wrong) and extraneous (not authorized) is the usual trap.

KEY POINTS

  • Omission means not performing a task.
  • Commission means accomplishing a task incorrectly.
  • Extraneous means performing a task that is not authorized.

SOURCES

  • FAA-H-8083-30B ch14 "Introduction" (three types of human error)
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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.