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Enroute to diversion airport (for weather) crew of B-737 exceeded limit speed after the autothrottle disengaged and created an overspeed situation.
| Attributes | |
| ACN | 1275303 |
| Time | |
| Date | 201506 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Throttle/Power Lever |
| Person 1 | |
| Function | Captain |
| Experience | Flight Crew Last 90 Days 239 Flight Crew Type 239 |
| Events | |
| Anomaly | Deviation - Speed All Types |
Narrative:
In a newer model aircraft; the autothrottle disconnected and would not reengage. During cruise at FL380 in turbulence; the speed increased rather suddenly to mach .83 and the airspeed warning clacker sounded. The thrust was reduced and aircraft speed was brought back within limits. It was a busy phase of flight as we were in the process of having to divert. After landing; dispatch and maintenance were notified and a logbook entry was made.this might have been avoided altogether by selecting a slightly lower cruise mach speed; or a lower altitude; but more vigilance by both pilots would have been the only way to prevent this overspeed.
Original NASA ASRS Text
Title: Enroute to diversion airport (for weather) crew of B-737 exceeded limit speed after the autothrottle disengaged and created an overspeed situation.
Narrative: In a newer model aircraft; the autothrottle disconnected and would not reengage. During cruise at FL380 in turbulence; the speed increased rather suddenly to Mach .83 and the Airspeed Warning Clacker sounded. The thrust was reduced and aircraft speed was brought back within limits. It was a busy phase of flight as we were in the process of having to divert. After landing; Dispatch and Maintenance were notified and a logbook entry was made.This might have been avoided altogether by selecting a slightly lower cruise Mach speed; or a lower altitude; but more vigilance by both pilots would have been the only way to prevent this overspeed.
Data retrieved from NASA's ASRS site 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.