Horizon bar. The horizon bar displays
aircraft pitch and roll attitude with respect to the earth's
Pitch adjustment knob. This knob is used
to vertically adjust the symbolic miniature aircraft for
changes in the aircraft's level flight pitch attitude.
Symbolic miniature aircraft. Aircraft pitch
and roll attitudes are displayed by the relationship
between the fixed miniature aircraft symbol and the
movable attitude sphere.
surrounds the attitude sphere to provide a positive
attitude identification. When the aircraft is in an upright
position the upper (blue) eyelid is located next to the
upper (blue) half of the attitude sphere, while the lower
(brown) eyelid display is located next to the lower
(brown) half of the attitude sphere. Thus the eyelid
display maintains 'the proper ground-sky relationship,
regardless of the position of the sphere, to aid in
recovery from unusual attitudes.
VERTICAL SPEED INDICATORS.
Vertical speed indicators are installed separately on
the pilot's and copilot sides of the instrument panel (fig.
They indicate the rate at which the aircraft ascends or
descends based on changes in atmospheric pressure.
The indicator is a direct reading pressure instrument
requiring no electrical power for operation.
An accelerometer, located on the instrument panel,
registers and records positive and negative G loads
imposed on the aircraft. One hand moves in the
direction of the G load being applied while the other two
(one for positive G loads and one for negative g loads),
follow the indicating pointer to its maximum travel. The
recording pointers remain at the respective maximum
travel positions of the G's being applied, providing a
record of maximum G loads encountered. Depressing
the push-to-reset knob at the lower left corner of the
instrument allows the recording pointers to return to the
FREE AIR TEMPERATURE (FAT) GAGE.
The free air temperature gage, mounted outboard of
the pilot's seat (fig. 2-10), indicates free air temperature
in degrees celsius.
Bank Angle Scale
Bank Angle Pointer
Pitch Angle Scale
Pitch Adjustment Knob
Lower Eyelid Display
Upper Eyelid Display
Symbolic Miniature Aircraft
Figure 2-40. Standby Attitude Indicator