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B777 captain experienced inability to maintain FL380 in western atlantic airspace and descended 400 ft before aircraft was again able to maintain FL380. Reporter was deviating to avoid convective weather at the time.
| Attributes | |
| ACN | 866361 |
| Time | |
| Date | 200912 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Person 1 | |
| Function | Captain |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter Weather / Turbulence |
Narrative:
Cleared by cpdlc (controller pilot data link communications) to climb to FL380 (max altitude in FMS was FL410). Upon reaching FL380 and deviating for weather in turbulence the aircraft was unable to remain above the lowest selectable airspeed (amber hook) with throttles full forward. Started a 200-300 FPM rate of descent. Eventually needed about 800 FPM rate of descent until about FL376 at which time we were able to climb back to FL380. Initial clearance required us to be at FL380 prior to XA44Z. We were back at the altitude by XA41Z. Reported level again by cpdlc.
Original NASA ASRS Text
Title: B777 Captain experienced inability to maintain FL380 in Western Atlantic airspace and descended 400 FT before aircraft was again able to maintain FL380. Reporter was deviating to avoid convective weather at the time.
Narrative: Cleared by CPDLC (controller pilot data link communications) to climb to FL380 (max altitude in FMS was FL410). Upon reaching FL380 and deviating for weather in turbulence the aircraft was unable to remain above the lowest selectable airspeed (amber hook) with throttles full forward. Started a 200-300 FPM rate of descent. Eventually needed about 800 FPM rate of descent until about FL376 at which time we were able to climb back to FL380. Initial clearance required us to be at FL380 prior to XA44Z. We were back at the altitude by XA41Z. Reported level again by CPDLC.
Data retrieved from NASA's ASRS site as of April 2012 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.