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A B747-200 reports N1 indicators and egt indicators overly sensitive to aircraft gross weight and high field elevation.
| Attributes | |
| ACN | 472629 |
| Time | |
| Date | 200005 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : skbo.airport |
| State Reference | FO |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Night |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747-100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | ground : takeoff roll |
| Route In Use | departure sid : skbo |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Experience | flight time last 90 days : 150 flight time total : 30000 flight time type : 9000 |
| ASRS Report | 472629 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Company Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
Aircraft equipped with penny & guiles engine instruments and are very sensitive to RPM (N1) and egt exceedances at high altitude (8355 ft) and high gross weights (309.7 kilos). When workload permitted, we checked the afm and found that exceedances were such that just a reduction of power to reduce exceedances and continue flight!
Original NASA ASRS Text
Title: A B747-200 RPTS N1 INDICATORS AND EGT INDICATORS OVERLY SENSITIVE TO ACFT GROSS WT AND HIGH FIELD ELEVATION.
Narrative: ACFT EQUIPPED WITH PENNY & GUILES ENG INSTS AND ARE VERY SENSITIVE TO RPM (N1) AND EGT EXCEEDANCES AT HIGH ALT (8355 FT) AND HIGH GROSS WTS (309.7 KILOS). WHEN WORKLOAD PERMITTED, WE CHKED THE AFM AND FOUND THAT EXCEEDANCES WERE SUCH THAT JUST A REDUCTION OF PWR TO REDUCE EXCEEDANCES AND CONTINUE FLT!
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.