-
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
- minute)
-
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
-
TRUE ALTITUDE
—?
- The actual
- height of an object above mean sea
- level.
-
UNLOADED ROTOR
—?
- The state of
- a rotor when rotor force has been
- removed, or when the rotor is operating
- under a low or negative G condition.
-
TWIST GRIP
?
- —The power control
- on the end of the collective control.
-
TRANSVERSE-FLOW
EFFECT
?
- —A condition of increased
- drag and decreased lift in the aft portion
- of the rotor disc caused by the air
- having
- a greater induced velocity and
- angle
- in the aft portion of the disc.
-
TRANSLATIONAL LIFT
?
- additional lift obtained when entering
- forward flight, due to the increased
- efficiency of the rotor system.
-
UNDERSLUNG
—?
- 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.
-
PROFILE DRAG
—?
- 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
- increases
-
PRESSURE ALTITUDE
—?
-
- 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.
-
If
the governor fails?
- any change in collective pitch
- requires you to manually adjust the throttle to maintain
- correct r.p.m.
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