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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Flight cleared to FL350 but allegedly unable. Experienced stall buffet. Descended requesting lower altitude.
| Attributes | |
| ACN | 173051 |
| Time | |
| Date | 199103 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bhm |
| State Reference | AL |
| Altitude | msl bound lower : 34000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 150 flight time total : 5000 flight time type : 1000 |
| ASRS Report | 173051 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : exited adverse environment |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Turbulence experienced during climb leveled at FL310, which was optimum altitude according to pms (performance management system). Rough ride at FL310. ATC reported smoother ride higher. Requested climb to FL350. Reached FL350. Ride was smooth, but experienced stall buffet. Immediately began descent and requested FL330. Leveled at FL340, no buffet. Center soon cleared us to FL330. According to on board performance manual, flight in smooth air at FL350 should have been ok.
Original NASA ASRS Text
Title: FLT CLEARED TO FL350 BUT ALLEGEDLY UNABLE. EXPERIENCED STALL BUFFET. DESCENDED REQUESTING LOWER ALT.
Narrative: TURB EXPERIENCED DURING CLB LEVELED AT FL310, WHICH WAS OPTIMUM ALT ACCORDING TO PMS (PERFORMANCE MGMNT SYS). ROUGH RIDE AT FL310. ATC RPTED SMOOTHER RIDE HIGHER. REQUESTED CLB TO FL350. REACHED FL350. RIDE WAS SMOOTH, BUT EXPERIENCED STALL BUFFET. IMMEDIATELY BEGAN DSNT AND REQUESTED FL330. LEVELED AT FL340, NO BUFFET. CTR SOON CLRED US TO FL330. ACCORDING TO ON BOARD PERFORMANCE MANUAL, FLT IN SMOOTH AIR AT FL350 SHOULD HAVE BEEN OK.
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.