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Aircraft on approach has altitude alert issued by ATC and queried as to which runway using. All indications are correct.
| Attributes | |
| ACN | 268819 |
| Time | |
| Date | 199404 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : phl |
| State Reference | PA |
| Altitude | msl bound lower : 800 msl bound upper : 800 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : phl tower : dab |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach landing other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 25 flight time total : 5000 flight time type : 600 |
| ASRS Report | 268819 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Flight arriving from bos told to expect ILS 9R. On downwind, re-vectored for NDB 27L. Reported WX for approach well above minimums, I believe 1200-3. In a period of several mins approach control changed our approach from NDB 27L to ILS 27L and back to NDB 27L within 2 mi of NDB. Began approach and descent to minimums after passing NDB. Aircraft NDB needle showed on centerline. Issued altitude alert by tower at minimums. Rechked and we were at correct altitude. Then asked by tower 'which runway were we lined up with?' rechked bearing and showed on centerline. At this point, no visual contact with airport. Decision made to go around and at that moment runway was sighted. Uneventful landing. Advised ATC of our indications. Subsequent visual approach made to same runway 5 hours later received erratic indications from aircraft's ADF. One moment on correct bearing next moment 10 degrees off. Both pilot and copilot sides had the fluctuating needles. When runway was sighted on first approach, we were well right of phl runway 27L.
Original NASA ASRS Text
Title: ACFT ON APCH HAS ALT ALERT ISSUED BY ATC AND QUERIED AS TO WHICH RWY USING. ALL INDICATIONS ARE CORRECT.
Narrative: FLT ARRIVING FROM BOS TOLD TO EXPECT ILS 9R. ON DOWNWIND, RE-VECTORED FOR NDB 27L. RPTED WX FOR APCH WELL ABOVE MINIMUMS, I BELIEVE 1200-3. IN A PERIOD OF SEVERAL MINS APCH CTL CHANGED OUR APCH FROM NDB 27L TO ILS 27L AND BACK TO NDB 27L WITHIN 2 MI OF NDB. BEGAN APCH AND DSCNT TO MINIMUMS AFTER PASSING NDB. ACFT NDB NEEDLE SHOWED ON CTRLINE. ISSUED ALT ALERT BY TWR AT MINIMUMS. RECHKED AND WE WERE AT CORRECT ALT. THEN ASKED BY TWR 'WHICH RWY WERE WE LINED UP WITH?' RECHKED BEARING AND SHOWED ON CTRLINE. AT THIS POINT, NO VISUAL CONTACT WITH ARPT. DECISION MADE TO GAR AND AT THAT MOMENT RWY WAS SIGHTED. UNEVENTFUL LNDG. ADVISED ATC OF OUR INDICATIONS. SUBSEQUENT VISUAL APCH MADE TO SAME RWY 5 HRS LATER RECEIVED ERRATIC INDICATIONS FROM ACFT'S ADF. ONE MOMENT ON CORRECT BEARING NEXT MOMENT 10 DEGS OFF. BOTH PLT AND COPLT SIDES HAD THE FLUCTUATING NEEDLES. WHEN RWY WAS SIGHTED ON FIRST APCH, WE WERE WELL R OF PHL RWY 27L.
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.