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CA.VI.D.K2FAA-S-ACS-7B · Nov 2023Knowledge

Assistance available if lost (e.g., radar services, communication procedures).

ACS element text (the applicant demonstrates understanding of)

Assistance available if lost (e.g., radar services, communication procedures).

Bottom line

ATC and flight service specialists are the best external resources during flight. Flight Service Stations assist lost aircraft and aircraft in emergency situations.

Key numbers

Key numbers for Assistance available if lost (e.g., radar services, communication procedures).
NumberWhat it means
121.5 MHzGuard freq
243.0 MHzGuard freq
MAYDAY, preferably repeated three timesDistress call

FAA references

  1. PHAK ch. 2 (pp. 2-23–2-24) — FAA-H-8083-25C (2023)
  2. AIM 6-3-1 (Distress and Urgency Communications) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  3. AIM 4-1-17 (Radar Assistance to VFR Aircraft) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  4. PHAK ch. 16 (p. 16-34) — FAA-H-8083-25C (2023)
  5. RMH ch. 8 (p. 8-3) — FAA-H-8083-2A
  6. AIM 4-1-18 (Terminal Radar Services for VFR Aircraft) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  7. AIM 6-3-2 (Obtaining Emergency Assistance) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
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