AIM Text
- In addition to monitoring the NAVAID voice feature, the pilot should attempt to reestablish communications by attempting contact:
- On the previously assigned frequency; or
- With an FSS or with New York Radio or San Francisco Radio.
- If communications are established with an FSS or New York Radio or San Francisco Radio, the pilot should advise that radio communications on the previously assigned frequency have been lost giving the aircraft's position, altitude, last assigned frequency and then request further clearance from the controlling facility. The preceding does not preclude the use of 121.5 MHz. There is no priority on which action should be attempted first. If the capability exists, do all at the same time.
Source: FAA Aeronautical Information Manual · current edition · paragraph 6-4-3.
Research Notes
AIM 6-4-3 covers Reestablishing Radio Contact — the procedures to try when radio failure is suspected.
Systematic troubleshooting:
- Check volume control on radio
- Check speaker/headset selection
- Check squelch
- Check selected frequency (recheck the assigned freq)
- Try alternate radio (if dual installation)
- Try 121.5 (guard)
- Try previously-used Center/Approach frequency
- Try nearest Tower frequency
- Try cell phone if at low altitude (1-800-WX-BRIEF reaches FSS)
If contact restored: Notify ATC immediately. Update them on aircraft status. They may issue corrective instructions.
Reference: AIM 6-4-3.