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. The moveable indicating
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. Contains gyro and
reference lines for pitch and roll degrees.
(2) Roll Index. Rotates with aircraft to
provide measurement of angular displacement by the
(3) Roll Pointer. Indicates vertical in any roll
(4) Horizon Line. Indicates earth horizon
relative to aircraft pitch attitude.
(5) Pitch Knob. Rotates to adjust the
displacement of miniature aircraft.
(7) Symbolic Miniature Aircraft. Represents
aircraft nose and wings. Indicates pitch and roll
attitude relative to the horizon. Adjustable through
pitch knob for varying pitch attitudes.
3C-17. TURN AND SLIP INDICATORS.
a. Description. One turn and slip indicator is
installed on the pilots side of the instrument panel.
This indicator is gyroscopically controlled. The pilots
unit is operated by dc power. It is protected by a
5-ampere circuit breaker, placarded PILOT TURN &
SLIP, on the overhead circuit breaker panel, Figure
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 (Pilots Indicator).
When in view, indicates loss of power to the gyro.
acceleration (side-slip) of aircraft.
inclinometer on the bottom of the bezel.
3C-18. RADIO ALTIMETER (RA-315).
a. Description. The radio altimeter provides
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