Accident Summary
On 25 June 2020, at approximately 13:24 Zulu time, an MQ-9A Reaper unmanned aircraft (tail number 15-4295) lost engine power shortly after takeoff from runway 33 at Syracuse Hancock International Airport, New York. The aircraft impacted the ground about 600 feet from the departure end of the runway, resulting in significant damage valued at $6,085,179.00. Damage to civilian property was minimal, and no injuries or fatalities were reported.
Sequence of Events
At 13:23:41 Zulu, the mishap pilot (MP) applied takeoff power and began the takeoff roll. The aircraft lifted off at 13:24:14 Zulu and began its climb. Approximately seven seconds after becoming airborne, at about 150 feet above ground level, the aircraft experienced a complete loss of engine power. The loss of power occurred because the MP misidentified the flap lever; instead of pushing the flap lever forward to reduce flaps, the MP pulled the condition lever backward, which cut off fuel supply to the engine. Upon realizing the engine had failed, the mishap crew—comprising the MP and the mishap sensor operator—initiated emergency procedures and began the Critical Action Procedures for an engine failure. However, the MP continued to misidentify the appropriate lever and pulled the flap lever fully aft. The aircraft impacted the ground 21 seconds after the engine power loss, striking runway lights, spinning 180 degrees, and coming to rest approximately 600 feet from the departure end of runway 33.
Causes
The Abbreviated Accident Investigation Board (AAIB) determined that the mishap was caused by the MP misidentifying the flap lever. Specifically, pulling aft on the condition lever instead of pushing forward on the flap lever cut the fuel supply, stopping the engine, and leading to the impact.
Contributing Factors
The AAIB also found that a factor substantially contributing to the mishap was the design of the pilot Ground Control Station (GCS) Control Console Throttle Quadrant. The proximity of the condition lever and flap lever, along with a lack of markings, color differentiation, or a safety guard, contributed to the lever misidentification.
Aftermath
The aircraft was significantly damaged upon impact. The mishap crew was not injured. The AAIB conducted an abbreviated investigation and issued a report detailing the cause and contributing factor.