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main rotor head
- Fonte1
- FEDERAL AVIATION ADMINISTRATION. Helicopter flying handbook (FAA-H8083-21A). Washington, DC: FAA, 2012.
- Fonte2
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Circular 12: aerodrome obstruction charts. Montreal, 1949. (Cir. 12-AN/10)
- Contexto
- Hard contact with the ground can send a shock wave to the main rotor head, resulting in the blades of a three-bladed rotor system moving from their normal 120° relationship to each other. This could result in something like 122°, 122°, and 116° between blades. When one of the other landing gear strikes the surface, the unbalanced condition could be further aggravated.
- Except for one main rotor blade, which separated about 40 in. from its attach point, the remaining four main rotor blades were attached to the rotor hub. The blades showed no evidence of either preimpact distress, damage, or failure. The main rotor head assembly was in good condition, and there was no evidence of any preimpact damage or failure. There was no evidence of any preimpact damage or failure to the control system between the cockpit and the main rotor stationary swashplate and from the rotating swashplate to the rotor blades.
- Subárea
- Rotorcraft
- Français
- tête de rotor principal