SUPPLEMENT SG-3
CHAPTER 31 - INDICATIONG SYSTEM
AHRS1 GPS – AHRS 1
using backup GPS source.
AHRS is using the backup
GPS information
Ensure that a cell phone or
a device using cell phone
technology is not turned on
(even in a monitoring state)
in the cabin.
Check GPS status. If one or
both GPS receivers cannot
acquire a position lock,
troubleshoot GPS problems.
Replace the GRS 77.
AHRS1 GPS ‐ AHRS is
not receiving any GPS in-
formation
AHRS is not receiving any
GPS information.
Ensure that a cell phone or
a device using cell phone
technology is not turned on
(even in a monitoring state)
in the cabin.
Check GPS status. If one or
both GPS receivers cannot
acquire a position lock,
troubleshoot GPS problems.
Replace the GRS 77.
AHRS1 GPS – AHRS 1
operating in exclusively in
no‐GPS mode.
AHRS is not receiving any
GPS information.
Ensure that at least one
GPS has acquired a valid
position.
If GDU 620 does not have a
valid position, verify wiring
between GDU and GPS re-
ceiver, and configuration of
GDU 620 and GPS receiv-
er.
If GDU has a valid GPS
position, verify wiring be-
tween GDU and GRS. Also
verify time mark wiring.
Check GPS status. If
one or both GPS re-
ceivers cannot acquire
a position lock, trou-
bleshoot GPS prob-
lems.
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