Return land with an overweight landing.

Attributes
ACN	310847
Time
Date	199507
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	msl bound lower : 20000 msl bound upper : 20000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc tower : lax
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	other other
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 12000 flight time type : 1000
ASRS Report	310847
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	Other

Narrative:

During climb, observed right constant speed drive outlet temperature higher than normal and rising. When temperature reached caution range (above 146 degrees C) started APU and transferred right AC bus to APU generator. Shortly thereafter, APU generator failed and AC x-tie locked out. Almost simultaneously, constant speed drive outlet temperature reached red line (163 degrees C) requiring constant speed drive disconnect. When constant speed drive disconnected, lost power to right AC bus. Declared emergency due to possible short on right AC bus. Returned stl, landed approximately 140000 pounds (maximum landing weight 130000 pounds). Landing normal. Maintenance found constant speed drive oversvced, APU generator failed for unknown reason. AC x-tie lockout reset on ground. AC bus ok. Placarded APU generator inoperative, reoriginated flight. Constant speed drive operation normal remainder of flight.

Original NASA ASRS Text

Title: RETURN LAND WITH AN OVERWT LNDG.

Narrative: DURING CLB, OBSERVED R CONSTANT SPD DRIVE OUTLET TEMP HIGHER THAN NORMAL AND RISING. WHEN TEMP REACHED CAUTION RANGE (ABOVE 146 DEGS C) STARTED APU AND TRANSFERRED R AC BUS TO APU GENERATOR. SHORTLY THEREAFTER, APU GENERATOR FAILED AND AC X-TIE LOCKED OUT. ALMOST SIMULTANEOUSLY, CONSTANT SPD DRIVE OUTLET TEMP REACHED RED LINE (163 DEGS C) REQUIRING CONSTANT SPD DRIVE DISCONNECT. WHEN CONSTANT SPD DRIVE DISCONNECTED, LOST PWR TO R AC BUS. DECLARED EMER DUE TO POSSIBLE SHORT ON R AC BUS. RETURNED STL, LANDED APPROX 140000 LBS (MAX LNDG WT 130000 LBS). LNDG NORMAL. MAINT FOUND CONSTANT SPD DRIVE OVERSVCED, APU GENERATOR FAILED FOR UNKNOWN REASON. AC X-TIE LOCKOUT RESET ON GND. AC BUS OK. PLACARDED APU GENERATOR INOP, REORIGINATED FLT. CONSTANT SPD DRIVE OP NORMAL REMAINDER OF FLT.

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.