are displayed by relationship between the fixed miniature
(3) Attitude sphere. Moves with respect to the
aircraft and movable sphere. The symbolic aircraft is
symbolic aircraft reference to display actual pitch and roll
flown to align the command bar to the aircraft symbol, in
attitude. Pitch up and down marks are in 5-degree
order to satisfy commands of the selected flight director
increments divided by an artificial horizon.
(4) Symbolic aircraft. Serves as a stationary
(11) RNAV annunciator.
symbol of the aircraft. Aircraft pitch and roll attitudes are
navigation is being controlled by the flight director, in
displayed by the relationship between the fixed miniature
NAV or APPR mode.
aircraft and the movable sphere.
3-20. Copilot's Attitude Director Indicator.
Provides manual positioning of the symbolic aircraft for
The copilot's attitude director
pitch attitude alignment.
indicator (ADI) (fig. 3-11) displays aircraft attitude as a
conventional pneumatically operated attitude gyro.
Attitude displayed is in relationship to an artificial
Illuminates when the aircraft descends below a selected
horizon. The instrument is equipped with a DH (decision
decision height, as set on the radio altimeter indicator.
height) annunciator, which works in conjunction with the
radar altimeter. Pneumatic power to drive the gyro is
3-21. Turn and Bank Indicators.
obtained from the aircraft pneumatic system.
a. Description. Two gyroscopically operated turn
b. Controls and Functions.
and bank indicators are installed separately on the pilot's
and copilot's sides of the instrument panel. The pilot's
(1) Roll attitude index. Displays aircraft roll
unit is operated by DC power and is protected by a 5-
attitude, as read against the roll attitude scale.
ampere circuit breaker placarded T&B located on the
(2) Roll attitude scale. Displays actual roll
attitude from 0, 10, 20, 30, 60, and 90 degrees.
Roll attitude index
Roll attitude scale
Symbolic aircraft alignment knob
Decision height annunciator
Figure 3-11. Copilot's Attitude Director Indicator
Change 7 3-19