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On a B757-200 left engine, an FAA safety inspector reported that fan turned with more force than right engine.
| Attributes | |
| ACN | 577660 |
| Time | |
| Date | 200303 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 220 flight time total : 5000 flight time type : 1350 |
| ASRS Report | 577660 |
| Person 2 | |
| Affiliation | government : faa |
| Function | other personnel other |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : left eng indications other other : person 2 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other Other |
| Supplementary | |
| Problem Areas | FAA |
| Primary Problem | FAA |
Narrative:
FAA inspector felt the fan section of the left engine was harder to turn than right engine. Air carrier X maintenance says there is no standard or requirement for fan section rotation force and #2 engines would be the same. Air carrier X maintenance examined engine performance report history and all reported parameters were normal with no changes over several months. We started and ran the engines with no differences noted in engine parameter during start or at idle. Flight was made with no problems and both engines operated normally. Apparently, the FAA inspector believed there was something wrong, based on the difference in force required to rotate the fan blades. This is a normal condition.
Original NASA ASRS Text
Title: ON A B757-200 L ENG, AN FAA SAFETY INSPECTOR RPTED THAT FAN TURNED WITH MORE FORCE THAN R ENG.
Narrative: FAA INSPECTOR FELT THE FAN SECTION OF THE L ENG WAS HARDER TO TURN THAN R ENG. ACR X MAINT SAYS THERE IS NO STANDARD OR REQUIREMENT FOR FAN SECTION ROTATION FORCE AND #2 ENGS WOULD BE THE SAME. ACR X MAINT EXAMINED ENG PERFORMANCE RPT HISTORY AND ALL RPTED PARAMETERS WERE NORMAL WITH NO CHANGES OVER SEVERAL MONTHS. WE STARTED AND RAN THE ENGS WITH NO DIFFERENCES NOTED IN ENG PARAMETER DURING START OR AT IDLE. FLT WAS MADE WITH NO PROBS AND BOTH ENGS OPERATED NORMALLY. APPARENTLY, THE FAA INSPECTOR BELIEVED THERE WAS SOMETHING WRONG, BASED ON THE DIFFERENCE IN FORCE REQUIRED TO ROTATE THE FAN BLADES. THIS IS A NORMAL CONDITION.
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.