FAA Airline Transport Pilot (ATM)Navigation, Air Traffic Control and ProceduresEasy
A pilot is tracking outbound from a VOR on the selected course. When the aircraft crosses the station and continues outbound on that same course, the course deviation indicator's ambiguity indicator will display which reading?
- AOFF flag
- BFROM
- CTO
- DNAV flag
Show answer & explanationAnswer & explanation
Correct answer: B. FROM
Once the aircraft passes the VOR station and is flying away from it on the selected course, the indicator changes from TO to FROM, showing the aircraft is now outbound on the selected radial.
Why the other options are wrong
- A. An OFF flag indicates unreliable or no signal, not normal outbound flight.
- C. TO indicates the aircraft is still flying toward the station, not away from it.
- D. A NAV flag is not a standard VOR ambiguity indication.
VOR TO/FROM Indicator
The TO/FROM flag on a VOR indicator shows whether the selected course, if flown, will take the aircraft toward or away from the station.
- TO means the station is ahead on the selected course
- FROM means the aircraft has passed the station
- The flag reverses as the aircraft crosses the station
Memory trick: TO means 'toward,' FROM means 'flew past'