Beechcraft C-12C Operator And Technical Reference Manual page 390

TM 1-1510-218-10
3C-16. STANDBY
SYSTEM
a. Description. The standby attitude indicator,
located below the TCAS II display, Figure 3C-15, is
powered by engine bleed air and provides a visual
reference of the aircraft pitch and roll. The attitude
indicator is comprised of a self-contained gyro to erect
the sphere providing the pitch and roll reference, an
indicating symbol representing the aircraft, and a
horizontal line behind the indicating symbol that
represents the horizon.
symbol may be adjusted vertically to correct for
variations in level flight attitudes by a small knob
located on the front base of the indicator.
1. Attitude Sphere
2. Roll Index
3. Roll Pointer
4. Horizon Line
5. Pitch Knob
6. Pitch Scale
7. Symbolic Miniature Aircraft
Figure 3C-15. Standby Attitude Indicator
b. Controls and Indexes.
(1) Attitude Sphere.
reference lines for pitch and roll degrees.
3C-36
ATTITUDE REFERENCE
The moveable indicating
Contains gyro and
(2) Roll Index.
provide measurement of angular displacement by the
roll pointer.
(3) Roll Pointer. Indicates vertical in any roll
attitude.
(4) Horizon Line.
relative to aircraft pitch attitude.
(5) Pitch Knob.
miniature aircraft.
(6) Pitch Scale.
displacement of miniature aircraft.
(7) Symbolic Miniature Aircraft. Represents
aircraft nose and wings.
attitude relative to the horizon.
pitch knob for varying pitch attitudes.
3C-17. TURN AND SLIP INDICATORS.
a. Description. One turn and slip indicator is
installed on the pilot's side of the instrument panel.
This indicator is gyroscopically controlled. The pilot's
unit is operated by dc power.
5-ampere circuit breaker, placarded PILOT TURN &
SLIP, on the overhead circuit breaker panel, Figure
2-16.
b. Control, Indicator, and Functions.
(1) Turn Rate Indicator. Indicates direction
and rate of turn. A 2-minute turn rate is indicated
when the turn rate indicator is deflected one needle
width to the left of the index.
(2) Index. A reference mark for alignment of
the turn rate indicator.
(3) GYRO Warning Flag (Pilot's Indicator).
When in view, indicates loss of power to the gyro.
(4) Inclinometer.
acceleration (side-slip) of aircraft.
c. Each EADI
inclinometer on the bottom of the bezel.
3C-18. RADIO ALTIMETER (RA-315).
a. Description.
the pilot with the actual altitude of the aircraft above
ground or surface level. The altitude is displayed in
the lower right-hand corner of the EADI when the
aircraft is at or below 2500 feet Above Ground Level
Rotates with aircraft to
Indicates earth horizon
Rotates to adjust the
Measures
Indicates pitch and roll
Adjustable through
It is protected by a
Indicates
and EHSI contains
The radio altimeter provides
pitch
lateral
an