Air carrier medium large transport generator failure at cruise altitude. Air conditioner bus tie would not close and APU could not be started until just before landing at destination airport.

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Attributes
ACN	82275
Time
Date	198802
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : buf
State Reference	NY
Altitude	msl bound lower : 21000 msl bound upper : 21000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 220 flight time total : 15000 flight time type : 6000
ASRS Report	82275
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : declared emergency none taken : unable none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Master caution light came on with no other indications. A few seconds later the left CSD oil pressure low light flickered very weakly and left a/C generator failed. A/C cross-tie failed. Disconnected CSD. APU would not start until just before landing. Requested priority handling by ATC because we were down to one a/C generator. Landed at buf without any problems.

Original NASA ASRS Text

Title: ACR MLG GENERATOR FAILURE AT CRUISE ALT. AIR CONDITIONER BUS TIE WOULD NOT CLOSE AND APU COULD NOT BE STARTED UNTIL JUST BEFORE LNDG AT DESTINATION ARPT.

Narrative: MASTER CAUTION LIGHT CAME ON WITH NO OTHER INDICATIONS. A FEW SECONDS LATER THE LEFT CSD OIL PRESSURE LOW LIGHT FLICKERED VERY WEAKLY AND LEFT A/C GENERATOR FAILED. A/C CROSS-TIE FAILED. DISCONNECTED CSD. APU WOULD NOT START UNTIL JUST BEFORE LNDG. REQUESTED PRIORITY HANDLING BY ATC BECAUSE WE WERE DOWN TO ONE A/C GENERATOR. LANDED AT BUF WITHOUT ANY PROBLEMS.

Data retrieved from NASA's ASRS site as of August 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.