Definition
An FAA Advisory Circular numbered 91-73, titled 'Parts 91 and 135 Single-Pilot, Flight School Procedures During Taxi Operations.' It provides guidance and recommended practices for flight crews to reduce runway incursions and improve safety during ground movement at airports.
Plain English
A guidance document from the FAA that tells pilots and flight schools how to taxi safely on the ground to avoid runway incursions and other ground mishaps.
Context Anchor
You may see AC 91-73 referenced in FAA training material about airport operations, taxi procedures, and runway incursion avoidance.
Derivation
Advisory Circular' means a non-regulatory document the FAA issues to advise — that is, to give guidance rather than create a rule. The number 91-73 ties it to Part 91 of the Federal Aviation Regulations (general operating rules), with 73 being its sequence number in that series.
Why Pilots Care
Runway incursions are one of the most serious ground safety risks in aviation. AC 91-73 lays out the FAA's recommended taxi procedures — including sterile cockpit during taxi, proper use of charts, and clear readback of taxi instructions — that pilots are expected to know and apply.
Intuition Check
Do not read “AC 91-73” as a rule number that automatically creates a new regulation. It is an FAA guidance document; it explains recommended safe practices pilots are expected to understand and use.
Example Sentence 1
The flight school's taxi procedures were built around the recommendations in AC 91-73.
Example Sentence 2
Instructors often point students to AC 91-73 when discussing traffic scan techniques.