ESI-500
Pilot’s Guide
4-2
Messages and Indications
Table 4-1: Indications and Display Conditions
CONDITION
CAUSE/CORRECTIVE ACTION
‘ALT’ invalidity is shown
on the right side of the
screen with the altitude
tape, altitude digital
readout, vertical speed,
and metric altitude digital
readout removed from the
screen.
Invalid altitude data is detected.
1. The air data sensor may need to
warm up. Expect up to 3 minutes
to warm up at colder temperatures.
The ALT invalidity will be shown at
this time.
2. If invalidity continues, cycle power
to the system.
‘ATT FAIL’ invalidity is
shown on the center of
the screen with the pitch
tape, roll scales, roll point-
er, and slip/skid indicator
removed from the screen.
The attitude data required to compute
attitude is invalid.
1. Cycle power to the system. (Ensure
aircraft is not moved during the
alignment period).
2.
During flight only. The rate of
motion of the indicator exceeding
300 degrees per second (in any
axis). Attitude will re-align when rate
of motion is less than 300 degrees.
‘HDG’ invalidity.
The heading tape and
readout are removed from
the screen.
Note – Heading is invalid
during alignment for units
configured to use a MAG-
500.
The data required to compute heading
is invalid.
1. Cycle power to the system.
2. The aircraft may be in an excessive
dip angle zone. Heading will return
after dip angles return to normal.
3. Invalid Air Data will cause the
heading invalidity.
4. Check the external heading source
for an error.
‘IAS’ invalidity is shown
on the left side of the
screen with the airspeed
tape, speed awareness
bar, and digital readout is
removed from the screen.
Air data is invalid.
1. The air data sensor may need to
warm up. Expect up to 3 minutes
to warm up at colder temperatures.
The IAS invalidity will be shown at
this time.
2. If invalidity continues, cycle power
to the system.
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