7-14 DESCRIPTION OF AIRPLANE AND SYSTEMS / INSTRUMENTS
ICON A5-B / PILOT’S OPERATING HANDBOOK CHANGE A2
CHAPTER 7
The AOA system works by using static ports to measure the
difference in pressure from the top and bottom of the left wing near
the leading edge. These values are compared and computed to
drive the AOA indicator electrically.
The horizontal line on the gauge depicts optimum AOA during
approach for landing and also maximum lift-to-drag ratio which can
be used for best range performance and best glide. The AOA gauge
can also be used to help guide control inputs to achieve specific
performance objectives during nearly every phase of flight. The
ability to reference AOA during each of these phases allows much
more precise inputs and also provides direct information about how
the wing is performing at any given time. During a turn, the AOA
system provides a direct indication of margin above stall in all
phases of flight. This permits optimization of turn performance
safely and efficiently. For cruise, AOA allows for efficient flight by
providing a simple cue for optimum range performance. The AOA
gauge is disabled at airspeeds below 30 knots.
7.6.3 ANNUNCIATOR PANEL
An Annunciator Panel (10) displaying Warning and Caution
indications is located near the center of the instrument console
between the primary and secondary instrument clusters. It is
designed to provide simple visual indications of aircraft conditions
that require corrective pilot action.
The upper row indications are Warning Lights, which illuminate in
red to draw pilot attention to take action on critical safety of flight
issues. The bottom row indications are Caution Lights, which
illuminate in amber to draw pilot attention to aircraft system status
or failures that may warrant action.
At the right side of the panel is a ‘TEST’ button. To verify that all
LEDs are functional while the button is pressed, all annunciators
should illuminate until the button is released.
For detailed meaning of, and response to, the annunciator lights, see
Emergency Procedures.
TEST
ENGINE ALTERNATOR
FUEL PRESSBATTERY
LAND
AIRCRAFT
SECURE
WING/ TAIL
PURGE
BILGE
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