MESSAGES
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SANDEL SN3500 EHSI PILOT’S GUIDE
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10-1
CHAPTER 10 MESSAGES
The Sandel SN3500 displays different messages to alert the pilot.
The messages are initiated by the Pilot, the Built in Self Test (BIST),
the Power On Self Test (POST), or by the system. Most of the pilot
initiated messages are shown for two seconds and are removed
automatically. Error messages, which are considered critical, are
placed on-screen permanently until acknowledged. The
acknowledgment is done using the ACK soft-key which will appear
and flash when such a message appears. It also monitors its own
internal temperature and provides warnings for over-temperature or
loss of cooling conditions.
Figure 10-1 Message and "ACK" button
Message Description
400HZ FAILED
Loss of main inverter. Note 1
400HZ HIGH
Problem with main inverter. Note 1
MESSAGES
82005-PG-D
SANDEL SN3500 EHSI PILOT’S GUIDE
PAGE
10-2
Message Description
400HZ LOW
Problem with main inverter. Note 1
AIRCRAFT POWER
Main power to unit out of specification.
AUTO-SLEW ACTIVE
Displayed when course knob is turned but
course knob setting is over-written by
Direct Track from the Long Range NAV
Receiver. Auto-slew operation can be
disabled by entering the NAV menu and
setting auto-slew to OFF. If auto-slew is
turned off, you will need to turn the course
pointer manually at every waypoint when
flying a flight plan.
AUX 400HZ FAILED
Loss of auxiliary inverter. Notes 1, 3
AUX 400HZ HIGH
Problem with auxiliary inverter. Notes 1, 3
AUX 400HZ LOW
Problem with auxiliary inverter. Notes 1, 3
COOLING FAN FAIL
The internal temperature is continuously
monitored. An over temperature
condition will only occur if the cooling
airflow is obstructed. As the temperature
rises a warning will be issued prior to
shutdown. If shutdown occurs the
SN3500 will shut off the projection lamp
and continue operating, and resume
normal operation as the internal
temperature falls.
