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Flight crew was led to believe that aircraft would make final cruise altitude based upon FMS information. While attempting final 200 ft of climb, the air carrier flight crew experienced a buffet. Descent initiated. ATC contacted.
| Attributes | |
| ACN | 303932 |
| Time | |
| Date | 199505 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : iah |
| State Reference | TX |
| Altitude | msl bound lower : 36800 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute airway : zhu |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 9000 flight time type : 3000 |
| ASRS Report | 303932 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 60 flight time total : 18000 flight time type : 3500 |
| ASRS Report | 304450 |
| Events | |
| Anomaly | altitude deviation : undershoot inflight encounter : weather inflight encounter other non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : exited adverse environment other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During climb to FL370 in attempt to get above WX at 36800 ft, experienced onset of light buffet. Immediately initiated descent, called ATC for clearance to FL330. Received clearance immediately. FMS indicated aircraft capable of FL370 and closest painted WX was 80 NM. WX was unstable approaching FL370. Recommend verification of FMS information with other performance data when operating close to performance limit. Supplemental information from acn 304450: descent with autoplt off. Called ZHU for clearance to FL330.
Original NASA ASRS Text
Title: FLC WAS LED TO BELIEVE THAT ACFT WOULD MAKE FINAL CRUISE ALT BASED UPON FMS INFO. WHILE ATTEMPTING FINAL 200 FT OF CLB, THE ACR FLC EXPERIENCED A BUFFET. DSCNT INITIATED. ATC CONTACTED.
Narrative: DURING CLB TO FL370 IN ATTEMPT TO GET ABOVE WX AT 36800 FT, EXPERIENCED ONSET OF LIGHT BUFFET. IMMEDIATELY INITIATED DSCNT, CALLED ATC FOR CLRNC TO FL330. RECEIVED CLRNC IMMEDIATELY. FMS INDICATED ACFT CAPABLE OF FL370 AND CLOSEST PAINTED WX WAS 80 NM. WX WAS UNSTABLE APCHING FL370. RECOMMEND VERIFICATION OF FMS INFO WITH OTHER PERFORMANCE DATA WHEN OPERATING CLOSE TO PERFORMANCE LIMIT. SUPPLEMENTAL INFO FROM ACN 304450: DSCNT WITH AUTOPLT OFF. CALLED ZHU FOR CLRNC TO FL330.
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.