Card Set Information
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
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
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.
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
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