AI.II.H.R4FAA-S-ACS-25 · Nov 2023Risk management
Loss of a navigation signal.
Loss of a navigation signal.
Bottom line
GPS signals are vulnerable to intentional and unintentional interference from a wide variety of sources. GPS signal losses coupled with a lack of RAIM capability could present erroneous position and navigation information with no warning to the pilot. During flight, the FAA recommends operators remain prepared to revert to conventional instrument flight procedures and promptly notify ATC if they experience GPS anomalies.
FAA references
- AIM 1-2-4 (Recognizing, Mitigating, and Adapting to GPS Jamming and/or Spoofing) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
- PHAK ch. 16 (p. 16-33) — FAA-H-8083-25C (2023)
- PHAK ch. 16 (p. 16-23) — FAA-H-8083-25C (2023)
- PHAK ch. 16 (p. 16-31) — FAA-H-8083-25C (2023)
- AIM 1-1-13 (User Reports Requested on NAVAID Outages) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
- PHAK ch. 16 (p. 16-34) — FAA-H-8083-25C (2023)
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