<< >> NASA ASRS Report 191224, October 1991

Flight crew of light transport cpr jet lost both 1 and 2 electrical bus. Lost all navigation, had radio communication.

Attributes
ACN	191224
Time
Date	199110
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : buf
State Reference	NY
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw artcc : zob tower : bos
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 110 flight time total : 4800 flight time type : 1500
ASRS Report	191224
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 120 flight time total : 8800 flight time type : 1700
ASRS Report	191065
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

At FL330 we had a sudden and complete electrical power failure. We requested a descent to 290 out of concern for pressurization. I informed ATC that we had electrical problems that left us without any navigation or compass, except for wet compass and confirmed a loss of mode C. I requested vectors to destination and they agreed. We were level at 290 and ATC informed us of traffic which we saw pass under us. I informed ATC that our air data may also be affected by the electrical problems (bos center) and they should feel free to vector us around any possible conflicting traffic. At that point the pilot of our previously called traffic said 'that did not look like 1000 ft separation'. When I was asked by ATC, I told them that 'it is hard to judge, but it looked like 1000 ft to me'. I feel that all the controllers involved were very helpful and cooperative.

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Original NASA ASRS Text

Title: FLC OF LTT CPR JET LOST BOTH 1 AND 2 ELECTRICAL BUS. LOST ALL NAV, HAD RADIO COM.

Narrative: AT FL330 WE HAD A SUDDEN AND COMPLETE ELECTRICAL PWR FAILURE. WE REQUESTED A DSCNT TO 290 OUT OF CONCERN FOR PRESSURIZATION. I INFORMED ATC THAT WE HAD ELECTRICAL PROBLEMS THAT LEFT US WITHOUT ANY NAV OR COMPASS, EXCEPT FOR WET COMPASS AND CONFIRMED A LOSS OF MODE C. I REQUESTED VECTORS TO DEST AND THEY AGREED. WE WERE LEVEL AT 290 AND ATC INFORMED US OF TFC WHICH WE SAW PASS UNDER US. I INFORMED ATC THAT OUR AIR DATA MAY ALSO BE AFFECTED BY THE ELECTRICAL PROBLEMS (BOS CENTER) AND THEY SHOULD FEEL FREE TO VECTOR US AROUND ANY POSSIBLE CONFLICTING TFC. AT THAT POINT THE PLT OF OUR PREVIOUSLY CALLED TFC SAID 'THAT DID NOT LOOK LIKE 1000 FT SEPARATION'. WHEN I WAS ASKED BY ATC, I TOLD THEM THAT 'IT IS HARD TO JUDGE, BUT IT LOOKED LIKE 1000 FT TO ME'. I FEEL THAT ALL THE CTLRS INVOLVED WERE VERY HELPFUL AND COOPERATIVE.

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.