IR.I.B.K2gFAA-S-ACS-8C · Nov 2023Knowledge
g. Inflight Aviation Weather Advisories including Airmen's Meteorological Information (...
Acceptable weather products and resources required for preflight planning, current and forecast weather for departure, en route, and arrival phases of flight such as: g. Inflight Aviation Weather Advisories including Airmen's Meteorological Information (AIRMET), Significant Meteorological Information (SIGMET), and Convective SIGMET
Bottom line
An inflight weather advisory is issued in the form of either an AIRMET, SIGMET, or convective SIGMET. AIRMETs are intended to inform all pilots, especially VFR pilots and operators of sensitive aircraft, of potentially hazardous weather phenomena.
Key numbers
| Number | What it means |
|---|---|
| every 6 hours, with intermediate updates as needed for a particular area forecast region | AIRMET cycle |
| CONUS, Alaska, and Hawaii; none for U.S. Oceanic FIRs | AIRMET coverage |
| three: the AWC, the AAWU, and the WFO Honolulu | US MWOs |
| 48 conterminous states | HIWAS area |
FAA references
- PHAK ch. 13 (p. 13-11) — FAA-H-8083-25C (2023)
- AWH ch. 26 (p. 26-15) — FAA-H-8083-28A
- AWH ch. 26 (p. 26-2) — FAA-H-8083-28A
- PHAK ch. 13 (p. 13-4) — FAA-H-8083-25C (2023)
- AWH ch. 2 (p. 2-3) — FAA-H-8083-28A
- AC 91-92, paras. 7.6, 7.7 — AC No: 91-92
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