An MD82 in cruise at FL280 declared an emergency and diverted due to the inability to disconnect a failed right engine CSD.

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Attributes
ACN	502550
Time
Date	200102
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pit.airport
State Reference	PA
Altitude	msl single value : 28000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute airway : j91.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : multi engine pilot : atp
Experience	flight time last 90 days : 150 flight time total : 12500 flight time type : 500
ASRS Report	502550
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 6000 flight time type : 500
ASRS Report	502552
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : generator drive light other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Chart Or Publication Aircraft
Primary Problem	Aircraft

Narrative:

The right CSD low oil pressure light illuminated with high temperatures. CSD was not successfully disconnected through use of QRH. Over concern of continued operation of the unit in a damaged state, the decision was made to return to ZZZ. An emergency was declared. The right engine was operated at idle while practicable on the advice of maintenance technician's help, and an overweight landing was performed. The QRH does not address this situation. It assumes the CSD will disconnect, but we continued to show 100 volts and 390 cps and high rise and outlet temperatures.

Original NASA ASRS Text

Title: AN MD82 IN CRUISE AT FL280 DECLARED AN EMER AND DIVERTED DUE TO THE INABILITY TO DISCONNECT A FAILED R ENG CSD.

Narrative: THE R CSD LOW OIL PRESSURE LIGHT ILLUMINATED WITH HIGH TEMPS. CSD WAS NOT SUCCESSFULLY DISCONNECTED THROUGH USE OF QRH. OVER CONCERN OF CONTINUED OP OF THE UNIT IN A DAMAGED STATE, THE DECISION WAS MADE TO RETURN TO ZZZ. AN EMER WAS DECLARED. THE R ENG WAS OPERATED AT IDLE WHILE PRACTICABLE ON THE ADVICE OF MAINT TECHNICIAN'S HELP, AND AN OVERWT LNDG WAS PERFORMED. THE QRH DOES NOT ADDRESS THIS SIT. IT ASSUMES THE CSD WILL DISCONNECT, BUT WE CONTINUED TO SHOW 100 VOLTS AND 390 CPS AND HIGH RISE AND OUTLET TEMPS.

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.