A-21-001
NTSB Safety Recommendation — Aviation
Recommendation text
TO THE NATIONAL WEATHER SERVICE: Revise National Weather Service Instruction 30-2111 to clearly define “outage,” “failure,” and similar terms regarding individual automated surface observing system (ASOS) sensor and component performance and to include explicit maintenance actions intended to mitigate presumed erroneous ASOS sensor reporting that does not generate failure flags in maintenance monitoring data.
In plain language (FlightFinder summary)
The National Weather Service is directed to update its Instruction 30-2111 by clearly defining terms such as 'outage' and 'failure' as they apply to individual automated surface observing system (ASOS) sensor and component performance, and to outline specific maintenance actions intended to address presumed erroneous ASOS sensor reporting that does not trigger failure flags in maintenance monitoring data.
This plain-language summary is written by FlightFinder to explain the recommendation above. It is not the official wording — the verbatim NTSB text is quoted above.
Details
| Status | Open - Acceptable Response |
|---|---|
| Mode | Aviation |
| Closed | — |
| NTSB number | WPR19FA084 |
| Addressees | United States Department of Commerce, National Oceanic and Atmospheric Administration, National Weather Service |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).