Narrative:

First pushback of the trip. It had been raining all morning. The jet had a documented APU problem in the book that was fixed. On engine start; the #2 generator would not come on line. We returned to the gate. #2 generator was MEL'ed and disconnected. We got more gas for the APU usage. On takeoff prior to 'flaps 1' call; the APU failed. We were in IMC. We leveled at 8;000 ft and the captain gave me the aircraft. We contacted operations and dispatch; reviewed and followed the QRH. We both agreed on landing back at ZZZ. ATC vectored us back. We landed 12;000 pounds overweight. The captain applied brakes at 60 KTS. We changed to a different jet and continued.

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Original NASA ASRS Text

Title: A B737-300 flight crew experienced APU failure on takeoff with one generator inoperative. They coordinated with dispatch; ran the procedure; and returned to land at their departure airport.

Narrative: First pushback of the trip. It had been raining all morning. The jet had a documented APU problem in the book that was fixed. On engine start; the #2 generator would not come on line. We returned to the gate. #2 generator was MEL'ed and disconnected. We got more gas for the APU usage. On takeoff prior to 'flaps 1' call; the APU failed. We were in IMC. We leveled at 8;000 FT and the Captain gave me the aircraft. We contacted operations and dispatch; reviewed and followed the QRH. We both agreed on landing back at ZZZ. ATC vectored us back. We landed 12;000 LBS overweight. The Captain applied brakes at 60 KTS. We changed to a different jet and continued.

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.