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B737-800 was climbing in vertical speed mode; unnoticed by the flight crew. A near-stall and altitude excursion resulted.
| Attributes | |
| ACN | 1158812 |
| Time | |
| Date | 201403 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 392 |
| Person 2 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 250 |
| Events | |
| Anomaly | Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Speed All Types |
Narrative:
As we were leveling off at an intermediate altitude; we were assigned a climb and the captain selected the altitude in the MCP. I verified the altitude and noticed the vertical speed window +2500. I assumed the captain knew we were in vertical speed. I was distracted putting charts away when I heard the autopilot disengage (we were at the top of the minimum maneuvering speed). The captain took control of the aircraft; pitched down slightly to increase airspeed and; as a result; we descended approximately 500 ft. We resumed the climb and VNAV was engaged.
Original NASA ASRS Text
Title: B737-800 was climbing in Vertical Speed mode; unnoticed by the flight crew. A near-stall and altitude excursion resulted.
Narrative: As we were leveling off at an intermediate altitude; we were assigned a climb and the Captain selected the altitude in the MCP. I verified the altitude and noticed the Vertical Speed window +2500. I assumed the Captain knew we were in Vertical Speed. I was distracted putting charts away when I heard the autopilot disengage (we were at the top of the minimum maneuvering speed). The Captain took control of the aircraft; pitched down slightly to increase airspeed and; as a result; we descended approximately 500 FT. We resumed the climb and VNAV was engaged.
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.