What happened
On 26 January 2016, a BAe ATP, registration G-BUUR, was conducting a night cargo flight from Jersey to Guernsey. During the approach to Runway 27, which was subject to strong crosswinds and potential turbulence, the pilot flying attempted to disengage the autopilot. However, the crew did not hear the expected audio alert and believed the autopilot remained engaged, noting that the control columns felt unusually stiff.
As the aircraft approached the runway, the commander initiated a go-around. During this maneuver, the aircraft exhibited a significant pitch-up tendency. The crew was subsequently alerted to the activation of the Standby Control System (SCS), which resulted in the left and right elevators operating in split control. Due to the high workload and distraction caused by the control issues, the crew did not follow standard operating procedures, leading to the delayed retraction of landing gear and flaps. The aircraft eventually leveled off, and the crew re-engaged the autopilot before proceeding to a safe landing.
Investigation findings
An investigation into the incident revealed that while the aircraft's systems were functioning, the crew's perception of the automation was impacted by the lack of audible confirmation. The investigation also noted that the aircraft's controls were subject to high physical loads during the maneuver.
Although the investigation could not definitively prove a mechanical failure, it was noted that the split-elevator condition occurred during a period of high control inputs. The investigation also highlighted that the crew's ability to manage the situation was hampered by the complexity of the event and the deviation from standard operating procedures. The investigation concluded that the primary issues were related to flight crew workload and the management of the automation during a high-stress approach.
Safety improvements
Following the investigation, several actions were taken to improve flight safety and operational procedures. The operator reviewed its training programs to ensure that crews are better prepared to handle automation-related issues and high-workload environments. Additionally, procedures for managing unexpected flight control configurations were reviewed to ensure that crews can effectively respond to such events.