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BE90 pilot experiences rapid gyro precession during ILS approach in IMC resulting in a missed approach. A second approach is attempted with ATC using no gyro procedures; which is also unsuccessful. Reporter elects to fly west to VMC successfully.
| Attributes | |
| ACN | 872394 |
| Time | |
| Date | 201002 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Beechcraft King Air Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Final Approach |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Attitude Indicator(Gyro/Horizon/ADI) |
| Person 1 | |
| Function | Captain Single Pilot |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 75 Flight Crew Total 19500 Flight Crew Type 450 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
Heading gyro began to vary in direction while intercepting the ILS. Descending on the approach I became off course. I notified ATC of heading failure and was vectored for a missed approach via gca (ground controlled approach) vectors and a climb. ATC gave gca approach vectors and descent. On second approach course alignment was better; but not sufficient to complete the approach. ATC advised to execute a missed approach; at which time I had already began to perform the missed approach using the needle; ball; airspeed indicators; and right hand flight instruments. I departed west bound to VFR conditions. The avionics department benched checked the heading gyro to find that it was precessing. Better to prevent recurrence would have been to not execute the approach without the heading gyro properly working and having to use basic instruments and to look cross panel to right hand instruments.
Original NASA ASRS Text
Title: BE90 pilot experiences rapid gyro precession during ILS approach in IMC resulting in a missed approach. A second approach is attempted with ATC using no gyro procedures; which is also unsuccessful. Reporter elects to fly west to VMC successfully.
Narrative: Heading gyro began to vary in direction while intercepting the ILS. Descending on the approach I became off course. I notified ATC of heading failure and was vectored for a missed approach via GCA (Ground Controlled Approach) vectors and a climb. ATC gave GCA approach vectors and descent. On second approach course alignment was better; but not sufficient to complete the approach. ATC advised to execute a missed approach; at which time I had already began to perform the missed approach using the needle; ball; airspeed indicators; and right hand flight instruments. I departed west bound to VFR conditions. The avionics department benched checked the heading gyro to find that it was precessing. Better to prevent recurrence would have been to not execute the approach without the heading gyro properly working and having to use basic instruments and to look cross panel to right hand instruments.
Data retrieved from NASA's ASRS site as of April 2012 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.