Airman Certification Standards
ACS AI.V.D
Taxiing, Airport Signs, and Lighting (ASEL, AMEL)
Knowledge
Elements of safe taxi operations.
Current airport aeronautical references and information resources such as the Chart Supplement, airport diagram, and Notices to Air Missions (NOTAMs).
Taxi instructions/clearances.
Airport markings, signs, and lights.
Visual indicators for wind.
Aircraft lighting, as appropriate.
Procedures for:
a. Appropriate flight deck activities prior to taxi, including route planning and identifying the location of Hot Spots
b. Radio communications at towered and nontowered airports
c. Entering or crossing runways
d. Night taxi operations
e. Low visibility taxi operations
Risk Management
Activities and distractions.
Confirmation or expectation bias as related to taxi instructions.
A taxi route or departure runway change.
Runway incursion.
Skill
Receive and correctly read back clearances/instructions, if applicable.
Use an airport diagram or taxi chart during taxi, if published, and maintain situational awareness.
Position the flight controls for the existing wind, if applicable.
Complete the appropriate checklist(s). 30
Perform a brake check immediately after the airplane begins moving.
Maintain positive control of the airplane during ground operations by controlling direction and speed without excessive use of brakes.
Comply with airport/taxiway markings, signals, and air traffic control (ATC) clearances and instructions.
Position the airplane properly relative to hold lines.
Retrieved from ecfr.gov on July 17, 2026.