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An ATCT local controller passes on the notion from a C172 pilot that ASOS is not reporting WX properly.
| Attributes | |
| ACN | 275895 |
| Time | |
| Date | 199406 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : csg |
| State Reference | GA |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : csg |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach landing other |
| Route In Use | approach : svfr approach : contact |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Experience | controller military : 4 controller radar : 11 |
| ASRS Report | 275895 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | inflight encounter : weather |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
The XA56Z ASOS observation had sky clear below 12000 ft and visibility 10 plus. There appeared to be a ceiling much lower. About XB02, a C172 was inbound from the northwest and asked for an IFR clearance and a contact approach. This was done. After the aircraft got on the ground, he said the ceiling was about 800 ft. The ASOS has made many of this type of error. I think it is unsafe for the purpose of aviation, especially during rapidly changing conditions.
Original NASA ASRS Text
Title: AN ATCT LCL CTLR PASSES ON THE NOTION FROM A C172 PLT THAT ASOS IS NOT RPTING WX PROPERLY.
Narrative: THE XA56Z ASOS OBSERVATION HAD SKY CLR BELOW 12000 FT AND VISIBILITY 10 PLUS. THERE APPEARED TO BE A CEILING MUCH LOWER. ABOUT XB02, A C172 WAS INBOUND FROM THE NW AND ASKED FOR AN IFR CLRNC AND A CONTACT APCH. THIS WAS DONE. AFTER THE ACFT GOT ON THE GND, HE SAID THE CEILING WAS ABOUT 800 FT. THE ASOS HAS MADE MANY OF THIS TYPE OF ERROR. I THINK IT IS UNSAFE FOR THE PURPOSE OF AVIATION, ESPECIALLY DURING RAPIDLY CHANGING CONDITIONS.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.