CA.III.B.K4FAA-S-ACS-7B · Nov 2023Knowledge
Use of automated weather and airport information.
Use of automated weather and airport information.
Bottom line
AUTOMATED SURFACE OBSERVING SYSTEM (ASOS)—Weather reporting system which provides surface observations every minute via digitized voice broadcasts and printed reports. At uncontrolled airports that are equipped with ASOS/AWOS with ground-to-air broadcast capability, the one-minute updated airport weather should be available to you within approximately 25 NM of the airport below 10,000 feet.
Key numbers
| Number | What it means |
|---|---|
| every minute | ASOS update |
| approximately 25 NM below 10,000 feet, at uncontrolled ASOS/AWOS airports with ground-to-air broadcast capability | Broadcast range |
FAA references
- IFH Glossary (p. G-3) — FAA-H-8083-15B
- AIM 4-3-27 (Operations at Uncontrolled Airports With Automated Surface Observing System (ASOS)/Automated Weather Observing System (AWOS)) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
- PHAK ch. 13 (p. 13-2) — FAA-H-8083-25C (2023)
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