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B757-200 suffers N1 overspeed on two successive takeoff attempts. Second occurs at high speed and takeoff continued.
| Attributes | |
| ACN | 730998 |
| Time | |
| Date | 200703 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : mmmx.airport |
| State Reference | FO |
| Altitude | agl single value : 0 |
| Environment | |
| Weather Elements | Thunderstorm |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| 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 |
| Experience | flight time last 90 days : 100 flight time total : 7000 flight time type : 5000 |
| ASRS Report | 730998 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : n1 indicator other flight crewa |
| Resolutory Action | flight crew : landed as precaution other |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
First takeoff was rejected due to a bad engine indication (left engine) prior to 80 KTS. After returning to blocks; maintenance spent several hours performing checks on left engine. Deemed good; we departed for a second time. On second takeoff roll; same bad engine indication (N1 overspeed) returned after 80 KTS. Deemed safe to continue takeoff; additional bad engine indications occurred after liftoff (excessive egt). Now decision was made to return to airport. Engine was running fine at slightly reduced power setting; no emergency declared and flight around traffic pattern was uneventful.
Original NASA ASRS Text
Title: B757-200 SUFFERS N1 OVERSPEED ON TWO SUCCESSIVE TKOF ATTEMPTS. SECOND OCCURS AT HIGH SPEED AND TKOF CONTINUED.
Narrative: FIRST TKOF WAS REJECTED DUE TO A BAD ENG INDICATION (L ENG) PRIOR TO 80 KTS. AFTER RETURNING TO BLOCKS; MAINT SPENT SEVERAL HRS PERFORMING CHKS ON L ENG. DEEMED GOOD; WE DEPARTED FOR A SECOND TIME. ON SECOND TKOF ROLL; SAME BAD ENG INDICATION (N1 OVERSPEED) RETURNED AFTER 80 KTS. DEEMED SAFE TO CONTINUE TKOF; ADDITIONAL BAD ENG INDICATIONS OCCURRED AFTER LIFTOFF (EXCESSIVE EGT). NOW DECISION WAS MADE TO RETURN TO ARPT. ENG WAS RUNNING FINE AT SLIGHTLY REDUCED PWR SETTING; NO EMER DECLARED AND FLT AROUND TFC PATTERN WAS UNEVENTFUL.
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.