This resulted in the detachment of the main
rotor head from the helicopter and was rapidly followed by main rotor blade strikes on the pylon and tail boom, which became severed from the fuselage.
What makes this accident worth discussing is that both individuals knew that the mast nut, which retains the
rotor head in place atop the mast, had been removed two days earlier.
Rotor head on the other hand, apply water more uniformly than spray heads, and are better for watering slopes or larger areas such as lawns.
"It's a lot easier to see how the lifting ring screws into the
rotor head of a Chinook when you see a video clip of someone actually twisting it on-as opposed to seeing a black and white photo," said mechanical engineer Dan Nonnemacher.
Damage to the helicopter was assessed after an inspection of the dynamic components, including the rotor blades, extenders, the main
rotor head, and gearbox.
Flight Lieutenant Ian Griffiths, who took part in the rescue operation, said: ``We attached straps to the
rotor head and to the underside of our helicopter and we lifted it out of the valley.''
"The
rotor head and the tail is the same as legacy H-60s, the Bravo and Foxtrot.
Jaime Beggs discovered failing blade pins while inspecting the main
rotor head on an HH-60 Pave Hawk that had just returned from a mission.
The fluxes can eliminate plugging in the shaft,
rotor head or both, resulting in savings in the cost of the shaft and rotor and in downtime.
Even more surprising was the observation that heating the rotor from the center provided the same temperature over the entire
rotor head. The heating element and sensor are attached to the central shaft at all times and the rotor, with the sensor accepting hole through the shank, is simply threaded over the heater (figure 3).
Adjusting the arc of a gear-drive
rotor head is similar for all brands.
The
rotor head is definitely of SA 330 Puma origin, but although Armscor did indeed confirm that the engines were new builds based on substantially improved versions of the Turmo (incidentally already used on the South African Pumas), the manufacturer declined to provide more technical data.
The preliminary report said the helicopter was cruising at 2000ft when the main
rotor head and mast suddenly detached.
No adjustments had been made to the main
rotor head, and no maintenance had been done on the plane.
