AWOS gives incorrect wind direction and speed information. Aircraft lands with tailwind.

Attributes
ACN	234684
Time
Date	199302
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cvn
State Reference	NM
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ewr
Operator	other
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10000 flight time type : 1000
ASRS Report	234684
Events
Anomaly	other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

I flew the localizer 4 approach to clovis municipal and landed at approximately XA00. As I started braking I began to slide, so I let the aircraft slow with very light braking. The icy runway combined with the direct tailwind made it difficult to slow the aircraft on the available runway. Later in the day I noticed the wind seemed to be blowing the AWOS. In the past the AWOS has been occasionally unreliable and notamed as unreliable in wind direction and speed. Callback conversation with reporter revealed the following information: reporter states the NOTAM had been in effect for about 6 weeks. Now back in service and seems fairly accurate. Quite often AWOS states information missing. Reporter guesses it is smart enough to know when not accurate and just leaves it out. Reporter made suggestion to use cannon AFB as a WX xchk since it is only 10 mi away. Tower part time so not always available, but could be helpful.

Original NASA ASRS Text

Title: AWOS GIVES INCORRECT WIND DIRECTION AND SPD INFO. ACFT LANDS WITH TAILWIND.

Narrative: I FLEW THE LOC 4 APCH TO CLOVIS MUNICIPAL AND LANDED AT APPROX XA00. AS I STARTED BRAKING I BEGAN TO SLIDE, SO I LET THE ACFT SLOW WITH VERY LIGHT BRAKING. THE ICY RWY COMBINED WITH THE DIRECT TAILWIND MADE IT DIFFICULT TO SLOW THE ACFT ON THE AVAILABLE RWY. LATER IN THE DAY I NOTICED THE WIND SEEMED TO BE BLOWING THE AWOS. IN THE PAST THE AWOS HAS BEEN OCCASIONALLY UNRELIABLE AND NOTAMED AS UNRELIABLE IN WIND DIRECTION AND SPD. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THE NOTAM HAD BEEN IN EFFECT FOR ABOUT 6 WKS. NOW BACK IN SVC AND SEEMS FAIRLY ACCURATE. QUITE OFTEN AWOS STATES INFO MISSING. RPTR GUESSES IT IS SMART ENOUGH TO KNOW WHEN NOT ACCURATE AND JUST LEAVES IT OUT. RPTR MADE SUGGESTION TO USE CANNON AFB AS A WX XCHK SINCE IT IS ONLY 10 MI AWAY. TWR PART TIME SO NOT ALWAYS AVAILABLE, BUT COULD BE HELPFUL.

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.