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B737 flight crew elects to return to airport after determining that one engine may not have produced full power during the takeoff.
| Attributes | |
| ACN | 753008 |
| Time | |
| Date | 200709 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 753008 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : epr other flight crewa |
| Resolutory Action | other |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Ambiguous |
Narrative:
Unable to set takeoff thrust from #1 engine after throttle advancement on runway. Double-checked engine anti-ice switches and even cycled them on and off in climb. The most thrust we got from the #1 engine was 1.92 EPR. #2 engine was at maximum power and egt showed near redline. Performed a normal landing back at departure airport without declaring an emergency. Possible cause may deal with the engine probes being blocked. In trying to set takeoff thrust the engines would not 'line up.' unknown reason for either excessive EPR on #2 engine or low EPR on #1 engine. Not much time to analyze the problem.
Original NASA ASRS Text
Title: B737 FLT CREW ELECTS TO RETURN TO ARPT AFTER DETERMINING THAT ONE ENGINE MAY NOT HAVE PRODUCED FULL POWER DURING THE TKOF.
Narrative: UNABLE TO SET TKOF THRUST FROM #1 ENG AFTER THROTTLE ADVANCEMENT ON RWY. DOUBLE-CHKED ENG ANTI-ICE SWITCHES AND EVEN CYCLED THEM ON AND OFF IN CLB. THE MOST THRUST WE GOT FROM THE #1 ENG WAS 1.92 EPR. #2 ENG WAS AT MAX PWR AND EGT SHOWED NEAR REDLINE. PERFORMED A NORMAL LNDG BACK AT DEP ARPT WITHOUT DECLARING AN EMER. POSSIBLE CAUSE MAY DEAL WITH THE ENG PROBES BEING BLOCKED. IN TRYING TO SET TKOF THRUST THE ENGS WOULD NOT 'LINE UP.' UNKNOWN REASON FOR EITHER EXCESSIVE EPR ON #2 ENG OR LOW EPR ON #1 ENG. NOT MUCH TIME TO ANALYZE THE PROB.
Data retrieved from NASA's ASRS site as of January 2009 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.