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Low frequency vibration?
- 100-500 cycles per minute)
- usually originate from the main rotor system.
Some possible causes
of low frequency vibrations?
- could be that the main rotor blades are out of track or
- balance, damaged blades, worn bearings, dampers out
- of adjustment, or worn parts
Medium frequency vibrations
- (1,000 - 2,000 cycles per
high frequency vibrations
- 2,000 cycles
- per minute or higher)
If you are nowhere near or cannotsee a town or city?
the first thing you should do is climb.
An increase in altitude
- increases radio and navigation
- reception range, and also increases radar coverage
- The actual
- height of an object above mean sea
- The state of
- a rotor when rotor force has been
- removed, or when the rotor is operating
- under a low or negative G condition.
- —The power control
- on the end of the collective control.
- —A condition of increased
- drag and decreased lift in the aft portion
- of the rotor disc caused by the air
- a greater induced velocity and
- in the aft portion of the disc.
- additional lift obtained when entering
- forward flight, due to the increased
- efficiency of the rotor system.
- A rotor hub that
- rotates below the top of the mast, as
- on semirigid rotor systems.
RESULTANT RELATIVE WIND
- Airflow from rotation that is modified
- by induced flow.
- Drag incurred
- from frictional or parasitic resistance
- of the blades passing through the air. It
- does not change significantly with the
- angle of attack of the airfoil section,
- but it increases moderately as airspeed
- The height
- above the standard pressure level of
- 29.92 in. Hg. It is obtained by setting
- 29.92 in the barometric pressure window
- and reading the altimeter.
the governor fails?
- any change in collective pitch
- requires you to manually adjust the throttle to maintain
- correct r.p.m.