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Numbers stamped on a fixed-pitch propeller hub

Aviation Mechanic Powerplant (AMP) practice question 7 of 10 on Propellers. ACS element AM.III.M.K7 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic Powerplant (AMP) practice mode.

Question bank updated 2026-09-22

QUESTIONAlong with the serial number, model number, and production certificate number, which FAA-issued number is stamped on the hub of a one-piece aluminum alloy fixed-pitch propeller?

  1. AThe airworthiness directive number
  2. BThe type certificate number
  3. CThe repair station number
Show the answer and explanation

Correct answer: B. The type certificate number

  • A — incorrect Airworthiness directive compliance is recorded in the propeller logbook, not stamped on the hub as part of the propeller's identification.
  • B — correct One-piece anodized aluminum alloy propellers are identified by stamping the hub with the serial number, model number, FAA type certificate number, production certificate number, and the number of times the propeller has been reconditioned.
  • C — incorrect The number of times the propeller has been reconditioned is stamped on the hub, but the identification marking does not include a repair station number.

BACKGROUND

Metal fixed-pitch propellers are now manufactured as one-piece anodized aluminum alloy units. Each one is identified by stamping the propeller hub with the serial number, the model number, the Federal Aviation Administration (FAA) type certificate number, the production certificate number, and the number of times the propeller has been reconditioned. The complete model number is a combination of a basic model number and suffix numbers that indicate the propeller diameter and pitch. These stamped data are what tie an installed propeller to its approved certification data. Airworthiness directive and service bulletin compliance, by contrast, is recorded in the propeller logbook.

STUDY TIP

When asked what identifies a propeller, think of the hub stamping list and keep it separate from the records that live in the propeller logbook.

KEY POINTS

  • The hub stamping includes the FAA type certificate number.
  • It also carries the serial, model, and production certificate numbers plus the reconditioning count.
  • The complete model number encodes the propeller diameter and pitch.

SOURCES

  • sources/amp-powerplant/ch07.txt "Metal Fixed-Pitch Propellers"
  • FAA-H-8083-32 ch07, Metal Fixed-Pitch Propellers
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MORE ON PROPELLERS

SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-32B Aviation Maintenance Technician Handbook – Powerplant, and 14 CFR part 43. Regulations and handbooks are revised; confirm details against the current edition.