Narrative:

Flying karlo 3 arrival into phoenix sky harbor international, captain is flying. Captain deselected VNAV (FMS) for descent. I was monitoring navaids xchking FMS in LNAV. Outbound from drake on 168 degree radial, I tuned up srp for intercept as published. Something didn't seem right xchking FMS LNAV with srp, but not far enough off to be obvious. I switched back to drake and we looked good. I brought my concern to the attention of the captain and he deselected LNAV (FMS) as we doublechked srp frequency selected. It was VFR and we had phx in sight and everything looked correct to us as reference to srp. We began to doubt the FMS. At this time we began to turn to intercept srr 312 degree radial inbound. At same time, controller called and said 'are you RNAV equipped?' reply, 'yes.' 'are you flying it?' reply, 'no, we're tracking srp inbound.' 'srp is out of service, we're radiating the NAVAID at the field on that frequency, you're in lukes airspace turn back east.' at this time we turned to correct back knowing FMS was correct and I (for the first time) idented srp. It was not the proper identify. Srp is 5 NM east of field and this was pointing at the airport. No NOTAMS stating srp OTS on flight plan. I then tuned up ATIS and it reported 'srp OTS.' but, station radiating on that frequency pointed within 5 NM of position 'looked' good. After this, controller warned following aircraft that srp was out and that frequency pointed at the airport. I should have idented this en route station but I didn't. However, what a set up!

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Original NASA ASRS Text

Title: ACR MLG TRACK HDG DEV ON STAR INTO PHX.

Narrative: FLYING KARLO 3 ARR INTO PHOENIX SKY HARBOR INTL, CAPT IS FLYING. CAPT DESELECTED VNAV (FMS) FOR DSCNT. I WAS MONITORING NAVAIDS XCHKING FMS IN LNAV. OUTBOUND FROM DRAKE ON 168 DEG RADIAL, I TUNED UP SRP FOR INTERCEPT AS PUBLISHED. SOMETHING DIDN'T SEEM RIGHT XCHKING FMS LNAV WITH SRP, BUT NOT FAR ENOUGH OFF TO BE OBVIOUS. I SWITCHED BACK TO DRAKE AND WE LOOKED GOOD. I BROUGHT MY CONCERN TO THE ATTN OF THE CAPT AND HE DESELECTED LNAV (FMS) AS WE DOUBLECHKED SRP FREQ SELECTED. IT WAS VFR AND WE HAD PHX IN SIGHT AND EVERYTHING LOOKED CORRECT TO US AS REF TO SRP. WE BEGAN TO DOUBT THE FMS. AT THIS TIME WE BEGAN TO TURN TO INTERCEPT SRR 312 DEG RADIAL INBOUND. AT SAME TIME, CTLR CALLED AND SAID 'ARE YOU RNAV EQUIPPED?' REPLY, 'YES.' 'ARE YOU FLYING IT?' REPLY, 'NO, WE'RE TRACKING SRP INBOUND.' 'SRP IS OUT OF SVC, WE'RE RADIATING THE NAVAID AT THE FIELD ON THAT FREQ, YOU'RE IN LUKES AIRSPACE TURN BACK E.' AT THIS TIME WE TURNED TO CORRECT BACK KNOWING FMS WAS CORRECT AND I (FOR THE FIRST TIME) IDENTED SRP. IT WAS NOT THE PROPER IDENT. SRP IS 5 NM E OF FIELD AND THIS WAS POINTING AT THE ARPT. NO NOTAMS STATING SRP OTS ON FLT PLAN. I THEN TUNED UP ATIS AND IT RPTED 'SRP OTS.' BUT, STATION RADIATING ON THAT FREQ POINTED WITHIN 5 NM OF POS 'LOOKED' GOOD. AFTER THIS, CTLR WARNED FOLLOWING ACFT THAT SRP WAS OUT AND THAT FREQ POINTED AT THE ARPT. I SHOULD HAVE IDENTED THIS ENRTE STATION BUT I DIDN'T. HOWEVER, WHAT A SET UP!

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.