I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 83
FOR SIMULATION USE ONLY ā NOT A TRAINING AID
ENGINE DATA MANAGER (EDM)
The engine data manager (EDM) monitors engine operating parameters and
illuminates the appropriate EICAS display when necessary. Non-engine-related
functions performed by the EDM include fuel balancing, fuel quantity indication, and
determination and display of DC volts, DC amps, hydraulic pressure, cockpit
pressure altitude, and cockpit differential pressure.
The EDM transmits engine data outputs using EDM A and EDM B channels. If one
output is bad, or if either data bus channel fails, a status message on the EICAS
displays EDM A or EDM B INOP in white text, respectively, when on the ground
(weight on wheels).
If the EDM fails, a red EDM FAIL warning illuminates on the EICAS display.
Redundant power is provided through circuit breakers, placarded EDM, located on
the battery bus and generator bus circuit breaker panels in the front cockpit.
ANGLE OF ATTACK SYSTEM
The flap compensated angle of attack (AOA) system includes an AOA vane (near left
wing tip), an AOA computer, an AOA display on the PFD, and two AOA indexers (one
in each cockpit).
The AOA system provides angle of attack information on the PFD and, when the
gear is extended, on the indexers. AOA information is valid for all combinations of
weight, configuration, and steady state bank angles.
Anti-ice protection is provided for the AOA system by a heated element in the vane.
AOA heat is controlled through the probes anti-ice switch, placarded PROBES ANTI-
ICE, located on the electrical switch panel in the front cockpit.
Power for the AOA system is provided by a circuit breaker, placarded AOA, located
on the battery bus circuit breaker panel in the front cockpit. Power for the AOA
vane anti-ice heat is provided through a circuit breaker, placarded AOA HT, located
on the generator bus circuit breaker panel in the front cockpit.
When optimum angle of attack (green band on display, amber donut on indexer) is
cross checked and verified with airspeed, angle of attack can be used to fly the
aircraft on optimum no-wind airspeed in the landing pattern.
AOA Vane
The AOA vane is positioned on a short post on the left wing leading edge. The
wedge-shaped vane aligns with the relative airflow and drives a potentiometer
through a belt and pulley system to provide an electronic signal to the AOA
computer.
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