<< >> NASA ASRS Report 943054, April 2011

An MD82 flight crew declared an emergency and diverted when they were unable to disconnect an overheating CSD.

Attributes
ACN	943054
Time
Date	201104
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Generator Drive
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Flying
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

After level off at FL320; we noticed left CSD oil outlet temp was pegged off-scale high while rise temp was above the yellow band at 20. QRH procedure dictated starting the APU and powering the left bus with the APU. It then dictates if the CSD oil temp does not decrease below the red line (which it did not); disconnect the CSD. We attempted to disconnect; but it would not. After a phone patch with dispatch and maintenance control; they concurred that there were no other disconnect options. We declared an emergency and diverted to ZZZ uneventfully. Landing was not overweight.

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• B747-100 crew had a CSD that was overheating, and were unabl...

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Original NASA ASRS Text

Title: An MD82 flight crew declared an emergency and diverted when they were unable to disconnect an overheating CSD.

Narrative: After level off at FL320; we noticed L CSD oil outlet temp was pegged off-scale high while rise temp was above the yellow band at 20. QRH procedure dictated starting the APU and powering the left bus with the APU. It then dictates if the CSD oil temp does not decrease below the red line (which it did not); disconnect the CSD. We attempted to disconnect; but it would not. After a phone patch with Dispatch and Maintenance Control; they concurred that there were no other disconnect options. We declared an emergency and diverted to ZZZ uneventfully. Landing was not overweight.

Data retrieved from NASA's ASRS site as of April 2012 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.