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AC-90 pilot lost the flight instruments, cabin pressurization, and had the aircraft go out of lateral trim. In ZSE class a.
| Attributes | |
| ACN | 478252 |
| Time | |
| Date | 200007 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| State Reference | CA |
| Altitude | msl single value : 19000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse.artcc tower : roa.tower |
| Operator | general aviation : corporate |
| Make Model Name | Turbo Commander 690C |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : single pilot |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Experience | controller radar : 10 flight time last 90 days : 60 flight time total : 1800 flight time type : 120 |
| ASRS Report | 478252 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
While in level flight at FL190, attempted to get wings level flight with aileron trim. Plane rolled hard right and began losing altitude while at the same time all instruments amd navigation systems, radios were lost. Pressurization dropped rapidly. Noticed soon that the control bus was completely off line. Tried resets, finally tied buses to restore power and navigation and control of the plane. Plane is in maintenance currently undergoing electrical system repair. Possible causes are failure of a 100 amp rcb on the electrical box, thereby bypassing the entire circuit breaker panel. Plane is 28 years old, my suggestion is more frequent inspections of older planes' electrical systems and wiring.
Original NASA ASRS Text
Title: AC-90 PLT LOST THE FLT INSTRUMENTS, CABIN PRESSURIZATION, AND HAD THE ACFT GO OUT OF LATERAL TRIM. IN ZSE CLASS A.
Narrative: WHILE IN LEVEL FLIGHT AT FL190, ATTEMPTED TO GET WINGS LEVEL FLIGHT WITH AILERON TRIM. PLANE ROLLED HARD RIGHT AND BEGAN LOSING ALTITUDE WHILE AT THE SAME TIME ALL INSTRUMENTS AMD NAV SYSTEMS, RADIOS WERE LOST. PRESSURIZATION DROPPED RAPIDLY. NOTICED SOON THAT THE CTL BUS WAS COMPLETELY OFF LINE. TRIED RESETS, FINALLY TIED BUSES TO RESTORE PWR AND NAV AND CTL OF THE PLANE. PLANE IS IN MAINT CURRENTLY UNDERGOING ELECTRICAL SYSTEM REPAIR. POSSIBLE CAUSES ARE FAILURE OF A 100 AMP RCB ON THE ELECTRICAL BOX, THEREBY BYPASSING THE ENTIRE CB PANEL. PLANE IS 28 YEARS OLD, MY SUGGESTION IS MORE FREQUENT INSPECTIONS OF OLDER PLANES' ELECTRICAL SYSTEMS AND WIRING.
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.