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An L1011 flight crew is unable to maintain their assigned altitude of FL350 while east of mem, tn.
| Attributes | |
| ACN | 450033 |
| Time | |
| Date | 199909 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : mem.airport |
| State Reference | TN |
| Altitude | msl bound lower : 34430 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011 Tri-Star All Series |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 150 flight time total : 15000 flight time type : 2000 |
| ASRS Report | 450033 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 9000 flight time type : 600 |
| ASRS Report | 450311 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : turbulence non adherence : company policies non adherence : clearance other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance other |
| Supplementary | |
| Problem Areas | Weather Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
The aircraft was leveled at FL350. Airspace deteriorated slowly due to turbulence and throttles set at insufficient power. Aircraft got behind power curve due to heavy gross weight at high altitude. Full power would not maintain altitude. Aircraft descended before clearance could be obtained from ATC for lower altitude. Clearance obtained after descending approximately 570 ft. Should have noticed airspeed falling sooner. Supplemental information from acn 450311: due to frequency change and congestion, clearance was not received until aircraft was in slow descent.
Original NASA ASRS Text
Title: AN L1011 FLC IS UNABLE TO MAINTAIN THEIR ASSIGNED ALT OF FL350 WHILE E OF MEM, TN.
Narrative: THE ACFT WAS LEVELED AT FL350. AIRSPACE DETERIORATED SLOWLY DUE TO TURB AND THROTTLES SET AT INSUFFICIENT PWR. ACFT GOT BEHIND PWR CURVE DUE TO HVY GROSS WT AT HIGH ALT. FULL PWR WOULD NOT MAINTAIN ALT. ACFT DSNDED BEFORE CLRNC COULD BE OBTAINED FROM ATC FOR LOWER ALT. CLRNC OBTAINED AFTER DSNDING APPROX 570 FT. SHOULD HAVE NOTICED AIRSPD FALLING SOONER. SUPPLEMENTAL INFO FROM ACN 450311: DUE TO FREQ CHANGE AND CONGESTION, CLRNC WAS NOT RECEIVED UNTIL ACFT WAS IN SLOW DSCNT.
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.