Uncommanded load jettison
I've had this happen to me twice in 2 consecutive days in an AS350. First time I'd taken the strain on the load and the lift gear dropped from the belly hook, on landing the hook was closed.We then switched hooks from another aircraft.Second day I was on approach with the load and the same thing happened everything let go from the belly hook, the hook on landing was open.
Both times the electric jettison was armed.And before you ask, it was not finger trouble!
Hooks have both been checked over thoroughly twice ,no faults found.The Aircraft has been checked over by 2 engineers and both the manual and electrics have shown no faults.The manual cable was not too tight or snagging anywhere.The electrical looms are clean the relay operates normally the pcb shows nothing unusual and the switch is clean and operating normally.
The aircraft has been flight tested since with a load with numerous pick ups and and landings in all configerations (crosswind, tailwind, harsh pickups trying to create as much vibration as possible) and has shown no faults.
I've 2500 hours of lifting experience in these aircraft and have never seen this problem.
Any input or advice would be most welcome.