Fly Oz's asymmetric training procedure involved failing one engine using the mixture control without confirmation the engine was subsequently restarted, rather than reducing throttle to simulate zero thrust in accordance with the Beechcraft E55 Airplane Flight Manual. This increased the risk of undetected asymmetric operation during descent and landing and the associated loss of control.
Fly Oz has amended its multi-engine training to simulate engine failures only using throttle (not mixture).
Following this accident Fly Oz amended its multi-engine training to simulate engine failures only using throttle at any height.
The ATSB acknowledges the safety action taken by Fly Oz. The action to conduct all multi-engine training simulated engine failures using throttle only will reduce the likelihood of undetected asymmetric operation during descent and landing and the associated loss of control.
