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SESK: Stuff Everyone Should Know · sesk.info/aero-mandatory-airport-sign

Which colors identify a mandatory airport instruction sign?

White characters on red.

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  1. Black on white
  2. Yellow on blue
  3. White on red ✔

Why: Mandatory signs mark runway entrances, critical areas, or prohibited areas. Their red background warns pilots that clearance or special care is required.

Huh, didn't know that: A black sign with yellow characters is a location sign.

The dad joke
The red airport sign was serious because it had a mandatory meeting.
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References

Answer: White on red. Mandatory signs mark runway entrances, critical areas, or prohibited areas. Their red background warns pilots that clearance or special care is required.

  1. Aerospace Dimensions Module 2: Aircraft Systems and Airports akwg.cap.gov/media/cms/Module_2__Aircraft_Systems_and_Airp_1A4CD2C6AF085_eae81.pdf
    These have a red background with white numbers/letters.
    Checked 2026-10-10.

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