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B737 captain reported auto pilot not engaging as required and non QRH procedures were used to get autopilot to function correctly.
| Attributes | |
| ACN | 1757193 |
| Time | |
| Date | 202008 |
| Local Time Of Day | 0601-1200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy |
Narrative:
Departing ZZZ; neither autopilot would engage during climb out. The first officer checked circuit breakers; reset the glareshield autopilot disconnect bar; and we tested each yoke disconnect button but neither autopilot would still engage. No QRH procedure could be found. We reported the autopilot issue to ATC and requested to stop our climb at an altitude below rvsm. Next we called ZZZ maintenance and their suggestion to reset the stab trim autopilot cutout switches successfully restored autopilot function; and flight continued normally at normal cruise altitude.this was the first flight of the day for both pilots and the first flight in several days for the aircraft. Preflight distractions included a previously unseen route error that kept wanting to reload from the cpdlc auto load and update. During pushback; a ground crew wing walker wanted us to abort our number 2 engine start because she felt the tug driver had cleared us to start sooner than she wanted the engines started. After pushback ATC informed us we only had 3 minutes to taxi to make our departure slot time.suggest adding 'stab trim cutout switches' to the before start checklist; and/or including a QRH procedure for 'neither autopilot will engage.'
Original NASA ASRS Text
Title: B737 Captain reported auto pilot not engaging as required and non QRH procedures were used to get autopilot to function correctly.
Narrative: Departing ZZZ; neither autopilot would engage during climb out. The first officer checked circuit breakers; reset the glareshield autopilot disconnect bar; and we tested each yoke disconnect button but neither autopilot would still engage. No QRH procedure could be found. We reported the autopilot issue to ATC and requested to stop our climb at an altitude below RVSM. Next we called ZZZ Maintenance and their suggestion to reset the stab trim autopilot cutout switches successfully restored autopilot function; and flight continued normally at normal cruise altitude.This was the first flight of the day for both pilots and the first flight in several days for the aircraft. Preflight distractions included a previously unseen route error that kept wanting to reload from the CPDLC auto load and update. During pushback; a ground crew wing walker wanted us to abort our number 2 engine start because she felt the tug driver had cleared us to start sooner than she wanted the engines started. After pushback ATC informed us we only had 3 minutes to taxi to make our departure slot time.Suggest adding 'Stab Trim Cutout Switches' to the Before Start Checklist; and/or including a QRH Procedure for 'Neither Autopilot Will Engage.'
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.