89000046-014 KSN 780/8XX/900 AeroNav AML STC Installation Manual for Helicopters
Rev 0 Page E-2
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Component Trouble Probable Cause Solution
AeroNav XXX Display appears excessively dim
or off
Configuration (configured for
“night mode”)
Check cockpit dimming rheostat
position
Check Flight Mode settings on
User Options page for Display
and Bezel Brightness and source
Check power button on AeroNav
Check Mx Mode settings on
Lighting page for proper setting
CMOS Battery Dead CAS
Message
The 10-year life expectancy of
the CMOS battery has been
reached. This may result in
longer GPS satellite acquisition
times.
Return the AeroNav to
BendixKing for battery
replacement
VHF Radio Slots displaying Red-
Xs
(Not Applicable for AeroNav
880/780)
No power on the P1002
Connector
Chassis ID not set to 0 or 1
Ensure all governing circuit
breakers have power
Check and set as required the
Chassis ID per section 7.3
Unit starts up in Maintenance
Mode
USB fob installed at power up
AeroNav last shut down in
Maintenance Mode
Ensure fob is not in the USB slot
and reapply power to the
AeroNav
Press the left or right side of the
AUX page until the “DONE” Line
Select Key is visible and press
that LSK to force the AeroNav to
restart into flight mode
Unable to get out of
Maintenance Mode or not sure
how to
Press the left or right side of the
AUX page until the “DONE” Line
Select Key is visible and press
that LSK to force the AeroNav to
restart into flight mode
AeroNav to AeroNav
Communication is not functional
as indicated by either
“CROSSYNC FAIL” CAS message
or no data sharing observed
between the AeroNavs
AERONAV is misconfigured
Wiring incorrect
Ensure RS-232 Channel 3 is set to
CrossSync on each AeroNav
Ensure serial Channel 3 wiring is
installed per Section 4.7
"Config Mismatch" CAS message
on AeroNav XXX (dual AeroNav
XXX only)
Configuration mismatch
between the two AERONAV
units
Power cycle the AeroNav units
Verify configuration on AeroNav
XXX units
If problem persists, send
AeroNav XXX log data to
BendixKing Technical Support
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