The cause of the deviation in the tail rotor
blades is still being investigated by the Air Force in collaboration with the Netherlands Air and Space Center (NLR) and manufacturer Boeing.
"There is evidence that a pair of over-trousers that had been packed in the cabin came out of the helicopter and became entangled in the tail rotor
," Chief Commissioner Jane Meares said, (https://www.straitstimes.com/asia/australianz/trousers-caused-fatal-new-zealand-chopper-crash-probe-shows) Straits Times r eported. "Paint marks on the over-trousers matched the color and profile of the tail rotor
blades, and marks on a tail rotor
blade match a zip and dome connector on the over-trousers."
The defects led to the tail rotor
blades' KILLED Pilots Izabela and Eric ' pitch being changed "till they reached the physical limit", said the Air Accidents Investigation Branch.
The report revealed that a system linking the pilot's pedals with the tail rotor
But the Air Accident Investigation Branch said yesterday the "investigation of the tail rotor
control system is being carried out as a priority".
Snowdonia National Park warden Aled Taylor, who saw the crash, said: "The tail rotor
of the helicopter stopped and the machine went out of control.
Both the Main and Tail Rotor
Actuators incorporate the latest features including the latest developments in servo-valves, solenoid valves, spool valves and detection devices including anti-jamming on the spool valve.
Due to the effect of the duct, the slipstream pattern and aerodynamic characteristic of ducted tail rotor
are different from the conventional open-type rotor.
A few minutes later, the crew was performing tail rotor
backup checks by moving the servo switch to the "backup" position, which caused the H-60 to lose control of the tail rotor
Airbus Helicopters presented its new clean-sheet medium-class rotorcraft design, the H160, which features the biggest-ever shrouded tail rotor
and an all-new "biplane stabilizer" design that the company says will enhance stability.
The chopper was on a test flight after regular checks at the GSDF Kasuminome air field, said local report, adding the aircraft' s main rotor was bent and its tail rotor
fell off after the crash landing.
The following parts all have seals: the pitch, roll and yaw piston; the primary servo pistons in the hydraulic deck; the main rotor damper pistons; the main landing gear struts; the tail landing gear struts; the tail rotor
servo piston and the stabilator actuator.