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An MD80S captain reported an ADF problem which caused the crew to turn in the wrong direction and worried that this may have been misperceived by sat as an intentional disregarding of their instructions.
| Attributes | |
| ACN | 463790 |
| Time | |
| Date | 200002 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sat.airport |
| State Reference | TX |
| Altitude | msl single value : 6000 |
| Aircraft 1 | |
| Controlling Facilities | tracon : sat.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other ndb |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 463790 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence other other anomaly other other spatial deviation |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
While working with sat RAPCON approximately AB38Z and at 6000 ft, we were instructed to proceed direct to alamo. We turned to follow the ADF needle and soon realized the needle was not providing proper guidance even though the frequency had been properly idented and tuned by both pilots. After seeing us turn the wrong way, RAPCON began questioning us and assumed we had ignored their instructions and had instead turned to a heading of 290 degrees as had previously been directed. We were then vectored to final approach course and a normal approach was conducted. We had the ADF receiver replaced while at sat and the equipment appeared to operate normally after that. I believe RAPCON thinks we were intentionally ignoring their instructions while actually we were caught by a malfunctioning piece of navigation equipment.
Original NASA ASRS Text
Title: AN MD80S CAPT RPTED AN ADF PROB WHICH CAUSED THE CREW TO TURN IN THE WRONG DIRECTION AND WORRIED THAT THIS MAY HAVE BEEN MISPERCEIVED BY SAT AS AN INTENTIONAL DISREGARDING OF THEIR INSTRUCTIONS.
Narrative: WHILE WORKING WITH SAT RAPCON APPROX AB38Z AND AT 6000 FT, WE WERE INSTRUCTED TO PROCEED DIRECT TO ALAMO. WE TURNED TO FOLLOW THE ADF NEEDLE AND SOON REALIZED THE NEEDLE WAS NOT PROVIDING PROPER GUIDANCE EVEN THOUGH THE FREQ HAD BEEN PROPERLY IDENTED AND TUNED BY BOTH PLTS. AFTER SEEING US TURN THE WRONG WAY, RAPCON BEGAN QUESTIONING US AND ASSUMED WE HAD IGNORED THEIR INSTRUCTIONS AND HAD INSTEAD TURNED TO A HDG OF 290 DEGS AS HAD PREVIOUSLY BEEN DIRECTED. WE WERE THEN VECTORED TO FINAL APCH COURSE AND A NORMAL APCH WAS CONDUCTED. WE HAD THE ADF RECEIVER REPLACED WHILE AT SAT AND THE EQUIP APPEARED TO OPERATE NORMALLY AFTER THAT. I BELIEVE RAPCON THINKS WE WERE INTENTIONALLY IGNORING THEIR INSTRUCTIONS WHILE ACTUALLY WE WERE CAUGHT BY A MALFUNCTIONING PIECE OF NAV EQUIP.
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.