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Pilot of an atx small transport twin descended 500 ft below approach altitude during an ILS approach due to being distraction by in-flight failure of slaved gyro heading indicator and HSI. The reporter requested assistance from ATC.
| Attributes | |
| ACN | 395075 |
| Time | |
| Date | 199802 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : msp |
| State Reference | MN |
| Altitude | msl bound lower : 2500 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : msp |
| Operator | common carrier : air taxi |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent : approach |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : single pilot |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 29000 flight time type : 30 |
| ASRS Report | 395075 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : overshoot non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : provided flight assist flight crew : returned to intended course or assigned course other other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
During the approach phase, approximately 20 mi from the airport, I lost the slave gyro that runs the pilot's HSI. I hit the fast slave which seemed to bring it back, and I was able to line up on the localizer runway 12R. Then I doublechked my r-hand directional gyro, which had about 5 hours since overhaul on it. I discovered it inoperative. At 13 mi I lost my slave compass again and was relying on magnetic compass (rough air). I informed the msp tower that I had lost my gyros and requested assistance, as I was having tracking problem. In the process of all this I got 500 ft low on the approach and I was called by tower for that variance and made the correction. I received good headings for the airport and was able to track the localizer GS. My mistake not to inform ATC of my problem and ask for assistance as soon as I had the problem!
Original NASA ASRS Text
Title: PLT OF AN ATX SMT TWIN DSNDED 500 FT BELOW APCH ALT DURING AN ILS APCH DUE TO BEING DISTR BY INFLT FAILURE OF SLAVED GYRO HDG INDICATOR AND HSI. THE RPTR REQUESTED ASSISTANCE FROM ATC.
Narrative: DURING THE APCH PHASE, APPROX 20 MI FROM THE ARPT, I LOST THE SLAVE GYRO THAT RUNS THE PLT'S HSI. I HIT THE FAST SLAVE WHICH SEEMED TO BRING IT BACK, AND I WAS ABLE TO LINE UP ON THE LOC RWY 12R. THEN I DOUBLECHKED MY R-HAND DIRECTIONAL GYRO, WHICH HAD ABOUT 5 HRS SINCE OVERHAUL ON IT. I DISCOVERED IT INOP. AT 13 MI I LOST MY SLAVE COMPASS AGAIN AND WAS RELYING ON MAGNETIC COMPASS (ROUGH AIR). I INFORMED THE MSP TWR THAT I HAD LOST MY GYROS AND REQUESTED ASSISTANCE, AS I WAS HAVING TRACKING PROB. IN THE PROCESS OF ALL THIS I GOT 500 FT LOW ON THE APCH AND I WAS CALLED BY TWR FOR THAT VARIANCE AND MADE THE CORRECTION. I RECEIVED GOOD HDGS FOR THE ARPT AND WAS ABLE TO TRACK THE LOC GS. MY MISTAKE NOT TO INFORM ATC OF MY PROB AND ASK FOR ASSISTANCE AS SOON AS I HAD THE PROB!
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.