FlyCurrentFLYCURRENT
AI.II.C.K4FAA-S-ACS-25 · Nov 2023Knowledge

Airport markings, signs, and lights including the importance of hold lines associated w...

ACS element text (the applicant demonstrates understanding of)

Airport markings, signs, and lights including the importance of hold lines associated with runways.

Bottom line

Do not enter a runway at a towered airport unless instructions are given from ATC to cross, takeoff from, or “line up and wait” on that specific runway.

Key numbers

Key numbers for Airport markings, signs, and lights including the importance of hold lines associated w...
NumberWhat it means
up to 150 feet prior to a runway holding position markingEnhanced CL
50-foot intervalsCL light spacing
white until last 3,000 feet, then red/white for 2,000 feet, all red last 1,000 feetCL light colors

FAA references

  1. PHAK ch. 14 (p. 14-33) — FAA-H-8083-25C (2023)
  2. PHAK ch. 14 (pp. 14-11–14-12) — FAA-H-8083-25C (2023)
  3. AFH Glossary (p. G-13) — FAA-H-8083-3C
  4. AC 91-73, para. 7g — AC No: 91-73B
  5. AC 91-73, paras. 7b, 7d — AC No: 91-73B
Members lesson

Build understanding you can use

Unlock the full lesson and continue studying this element.

  • Full teaching sections: What it is; Key points; Rules and numbers; How it is done
  • Check your understanding with answers you can reveal
  • Common mistakes paired with the FAA facts that correct them
View membership options