Accidents
Crash Report Notes Flaws in ZeroAvia’s Test Process
An April 2021 accident stemmed from ZeroAvia’s flight-test team failing to review the risk assessment following loss of propulsion on previous flights.

A Piper M-series airplane used by ZeroAvia as a flying testbed for its hydrogen propulsion system crashed on April 29, 2021, after electrical power was lost to both of its motors, according to a just-released final report from the UK Air Accident Investigation Branch (AAIB). The report notes that an emergency procedure to clear an inverter lockout proved to be ineffective and that the company failed to carry out an investigation of previous loss-of-power incidents also caused by inverter lockouts during three flights before the accident near Cranfield Airport in England.