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B737-300 flight crew experiences an autopilot disconnect horn after the to/GA button is pushed during takeoff. The takeoff is rejected and troubleshooting indicates that the autopilot must have been engaged at some time during preflight and not detected until the to/GA button was pushed. A child visitor to the cockpit may have pushed the button during preflight.
| Attributes | |
| ACN | 1216554 |
| Time | |
| Date | 201411 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Experience | Flight Crew Last 90 Days 196 |
| Person 2 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 122 Flight Crew Type 7000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Other / Unknown |
Narrative:
The captain gave me control of the aircraft as we centered on the runway. I powered up to >40% and hit to/GA. We received the autopilot disconnect horn and discontinued the takeoff and cleared the runway. We had a child guest in the cockpit during preflight and made the assumption that the child had pushed the autopilot button; which was then disconnected when to/GA was pushed. Flew to destination where the captain contacted dispatch and maintenance and the chief on duty. Told there was no discrepancy. Made an entry in the logbook.
Original NASA ASRS Text
Title: B737-300 flight crew experiences an autopilot disconnect horn after the TO/GA button is pushed during takeoff. The takeoff is rejected and troubleshooting indicates that the autopilot must have been engaged at some time during preflight and not detected until the TO/GA button was pushed. A child visitor to the cockpit may have pushed the button during preflight.
Narrative: The Captain gave me control of the aircraft as we centered on the runway. I powered up to >40% and hit TO/GA. We received the autopilot disconnect horn and discontinued the takeoff and cleared the runway. We had a child guest in the cockpit during preflight and made the assumption that the child had pushed the autopilot button; which was then disconnected when TO/GA was pushed. Flew to destination where the Captain contacted Dispatch and Maintenance and the Chief on Duty. Told there was no discrepancy. Made an entry in the logbook.
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.