Narrative:

The pilot wrote up '#1 engine slow to accelerate for takeoff. #1 engine backfires in thrust reverser during landing roll -- loud pop and flash.' corrective action, as I perceived, was a fuel scheduling problem. We performed a variable bleed valve feedback cable rig check per maintenance manual. We performed a timed acceleration check per maintenance manual. No problems were noted. I was informed today (apr/tue/02) that a borescope inspection may have been required. Callback conversation with reporter revealed the following information: the reporter stated the logbook report on the engine was #1 engine was slow to accelerate and backfires in reverse. The reporter said both technicians agreed this was a fuel scheduling problem and used the maintenance manual corrective action procedures. The reporter stated a variable bleed valve rig check and adjustment was in order and this was accomplished the feedback cable needing a small adjustment. The reporter said the aircraft was taxied to a run pad and the acceleration was checked and found within limits. The reporter stated the airplane was then returned to service. The reporter said about 1 week later, maintenance control advised local management a borescope procedure should have been performed. The reporter stated the maintenance manual did not require a borescope procedure. The reporter said the engine operated for 10 weeks before it hit again, but the log report was different and stated the engine was slow to accelerate and stalls in reverse. The reporter stated a main engine fuel control was replaced and operated since with no problems.

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Original NASA ASRS Text

Title: A B737-300 LOG RPT STATED ENG WAS SLOW TO SPOOL AND BACKFIRED IN REVERSE. TECHNICIANS MADE CORRECTIVE ACTION PER MAINT MANUAL.

Narrative: THE PLT WROTE UP '#1 ENG SLOW TO ACCELERATE FOR TKOF. #1 ENG BACKFIRES IN THRUST REVERSER DURING LNDG ROLL -- LOUD POP AND FLASH.' CORRECTIVE ACTION, AS I PERCEIVED, WAS A FUEL SCHEDULING PROB. WE PERFORMED A VARIABLE BLEED VALVE FEEDBACK CABLE RIG CHK PER MAINT MANUAL. WE PERFORMED A TIMED ACCELERATION CHK PER MAINT MANUAL. NO PROBS WERE NOTED. I WAS INFORMED TODAY (APR/TUE/02) THAT A BORESCOPE INSPECTION MAY HAVE BEEN REQUIRED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE LOGBOOK RPT ON THE ENG WAS #1 ENG WAS SLOW TO ACCELERATE AND BACKFIRES IN REVERSE. THE RPTR SAID BOTH TECHNICIANS AGREED THIS WAS A FUEL SCHEDULING PROB AND USED THE MAINT MANUAL CORRECTIVE ACTION PROCS. THE RPTR STATED A VARIABLE BLEED VALVE RIG CHK AND ADJUSTMENT WAS IN ORDER AND THIS WAS ACCOMPLISHED THE FEEDBACK CABLE NEEDING A SMALL ADJUSTMENT. THE RPTR SAID THE ACFT WAS TAXIED TO A RUN PAD AND THE ACCELERATION WAS CHKED AND FOUND WITHIN LIMITS. THE RPTR STATED THE AIRPLANE WAS THEN RETURNED TO SVC. THE RPTR SAID ABOUT 1 WK LATER, MAINT CTL ADVISED LCL MGMNT A BORESCOPE PROC SHOULD HAVE BEEN PERFORMED. THE RPTR STATED THE MAINT MANUAL DID NOT REQUIRE A BORESCOPE PROC. THE RPTR SAID THE ENG OPERATED FOR 10 WKS BEFORE IT HIT AGAIN, BUT THE LOG RPT WAS DIFFERENT AND STATED THE ENG WAS SLOW TO ACCELERATE AND STALLS IN REVERSE. THE RPTR STATED A MAIN ENG FUEL CTL WAS REPLACED AND OPERATED SINCE WITH NO PROBS.

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.