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The Air Accidents Investigation Department has revealed a report into an investigation into an accident involving a modified Piper PA-46-350P (G-HYZA) which occurred close to Cranfield Airport in Bedfordshire on 29 April 2021.
Throughout an experimental flight close to Cranfield Airport of a modified Piper PA-46-350P (G-HYZA), an electrically powered plane with electrical energy from hydrogen gas cells, suffered a lack of energy to {the electrical} motors. This meant a compelled touchdown was carried out, which severely broken the plane, the crew had been unhurt.
The lack of energy occurred throughout an interruption of the ability provide when, as a part of the check process, the battery was chosen to OFF with the intention of leaving {the electrical} motors solely powered by the hydrogen gas cell. Throughout this interruption, the windmilling propeller on the plane generated voltage that was excessive sufficient to function the inverter safety system. This then locked out the ability to the motors and the pilot and observer had been unable to reset the system and restore electrical energy.
Various elements contributed to the accident:
- Ample floor testing had not been carried out to find out the impact of the again voltage from a windmilling propellor on the inverter safety system.
- The emergency process to clear an inverter lock out after the safety system operated was ineffective.
- An investigation had not been carried out right into a earlier lack of energy ensuing from an inverter lock out, which occurred three flights previous to the accident flight.
- The chance evaluation had not been reviewed following the lack of propulsion on two earlier flights.
- Advert hoc adjustments had been made to the flight check plan, together with the place the place {the electrical} energy supply was switched, with out the information of the competent individual.
- The competent individual’s involvement was restricted in a variety of areas because of points throughout the organisational relationships, the quick tempo of the venture, different work commitments and restrictions from the COVID-19 pandemic.
- The operator’s chief govt and the flight check director took on the day-to-day administration accountability for a lot of the programme. Nonetheless neither particular person had the required security and flight check expertise for that function and their focus was totally on assembly key venture targets.
5 security suggestions are made, and the operator has additionally taken Security Motion to deal with a variety of findings from the accident.
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