Originally Posted by
ChipBurner
Has there ever been a dual engine failure in a 139? I couldn’t find anything stating one even went OEI.
The Babcock Spain autorotation a few years back initially was thought to be a double flame out due to turbulence, subsequently shown to have been a double lowside due to excessive Nf high (127%) situation, possibly induced by pilot over controlling in reaction to turbulence. You have to read the final report kinda carefully to understand that there was technically nothing wrong with the aircraft and it behaved as designed, however it would be easy to interpret a double engine failure, especially single pilot.
There have been many issues with pilots over reacting on the flight controls due to a surprise or perceived upset (floats inflated in flight, resulting in full pedal and a 90 degree roll induced by the pilot, recent 9 minute UA, other inadvertent AP release incidents etc) where the behaviour of the Nf could trigger the overspeed protection and subsequent reversion to manual control. Inadvertently hitting the Tq limiter (if selected on) during a recovery from turbulence could also decay the Nr, leading to a perception of a failure.
Be careful with your collective rates of movement, unexpected stuff can happen as a result!
Having said that, I wasn't in the cockpit and I have no idea why they ended up like this. Wishing them all a speedy recovery.