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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Beech jet 400 aircraft in cruise had double inverter failure resulting in multiple instrument failures. ATC provided no gyroscope vectors and destination WX was good so no difficulty in approach and landing. Postflt inspection revealed the rotating beacon was the cause of the inverter failures.
| Attributes | |
| ACN | 371179 |
| Time | |
| Date | 199706 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zny |
| State Reference | NY |
| Altitude | msl bound lower : 37000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny tower : ont |
| Operator | general aviation : corporate |
| Make Model Name | Beechjet 400 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 95 flight time total : 6300 flight time type : 700 |
| ASRS Report | 371179 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Lost both inverters en route and all associated system. Reported problem to ATC and requested no gyroscope vectors accordingly. They came back on line later and became intermittent. Some navigation and altdevs could have occurred but none were reported. After troubleshooting on the ground, discovered our rotating beacon caused the problem, we isolated the beacon by circuit breaker switch and no further problems occurred. We landed without problems in bos due to excellent VFR WX. Good practice of basic instrument skills from early training had to be used. No problems were reported by ATC, they were very helpful.
Original NASA ASRS Text
Title: BEECH JET 400 ACFT IN CRUISE HAD DOUBLE INVERTER FAILURE RESULTING IN MULTIPLE INST FAILURES. ATC PROVIDED NO GYROSCOPE VECTORS AND DEST WX WAS GOOD SO NO DIFFICULTY IN APCH AND LNDG. POSTFLT INSPECTION REVEALED THE ROTATING BEACON WAS THE CAUSE OF THE INVERTER FAILURES.
Narrative: LOST BOTH INVERTERS ENRTE AND ALL ASSOCIATED SYS. RPTED PROB TO ATC AND REQUESTED NO GYROSCOPE VECTORS ACCORDINGLY. THEY CAME BACK ON LINE LATER AND BECAME INTERMITTENT. SOME NAV AND ALTDEVS COULD HAVE OCCURRED BUT NONE WERE RPTED. AFTER TROUBLESHOOTING ON THE GND, DISCOVERED OUR ROTATING BEACON CAUSED THE PROB, WE ISOLATED THE BEACON BY CIRCUIT BREAKER SWITCH AND NO FURTHER PROBS OCCURRED. WE LANDED WITHOUT PROBS IN BOS DUE TO EXCELLENT VFR WX. GOOD PRACTICE OF BASIC INST SKILLS FROM EARLY TRAINING HAD TO BE USED. NO PROBS WERE RPTED BY ATC, THEY WERE VERY HELPFUL.
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.