Air carrier medium large transport aircraft experienced a major electrical equipment malfunction at high altitude level off and returned to departure airport.

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Attributes
ACN	214804
Time
Date	199207
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bke
State Reference	OR
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zse tower : mdt
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 13800 flight time type : 9000
ASRS Report	214804
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Just after level off at 33000, CSD low oil pressure light came on #1 CSD was disconnected and after communicating with dispatch decision was to divert back to sea (departure point). APU was put on MEL the previous night in pit before aircraft was flown to sea. Overweight landing was made in sea (126000 pounds). Sink rate less than 100 ft and landing was very smooth. After #1 CSD fixed, overweight landing inspection completed and #1 main tire changed flight was redispatched and 5 hours late.

Original NASA ASRS Text

Title: ACR MLG ACFT EXPERIENCED A MAJOR ELECTRICAL EQUIP MALFUNCTION AT HIGH ALT LEVEL OFF AND RETURNED TO DEP ARPT.

Narrative: JUST AFTER LEVEL OFF AT 33000, CSD LOW OIL PRESSURE LIGHT CAME ON #1 CSD WAS DISCONNECTED AND AFTER COMMUNICATING WITH DISPATCH DECISION WAS TO DIVERT BACK TO SEA (DEP POINT). APU WAS PUT ON MEL THE PREVIOUS NIGHT IN PIT BEFORE ACFT WAS FLOWN TO SEA. OVERWT LNDG WAS MADE IN SEA (126000 POUNDS). SINK RATE LESS THAN 100 FT AND LNDG WAS VERY SMOOTH. AFTER #1 CSD FIXED, OVERWT LNDG INSPECTION COMPLETED AND #1 MAIN TIRE CHANGED FLT WAS REDISPATCHED AND 5 HRS LATE.

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.