L3 Communications GH-3100 Pilot's Manual page 31

GH-3100 Start-Up and Self Test
Troubleshooting
(cont.)
INVALIDITY indications appear in Navigation data fields
or disappear. Typically these indications result from the loss of
information provided by the source units. Check those units for
operation. Report to Avionics Systems if indications become
persistent. See page 23.
ATTITUDE FAILURE indication appears. The unit's
internal attitude sensors have unsuccessfully aligned or failed.
Alignment can be attempted by recycling unit power, but this
MUST be performed when the aircraft is stationary or in
straight and level, non-accelerated flight. The unit's Air Data
and Navigational information will continue to operate. Report
the failure to Avionics Systems. See page 22.
The indication will also temporarily appear during unit start-
up with an additional message "Aligning." No action is
required.
Obvious discrepancy of pitch/roll indicators to that of true-
flight.
Initiate FAST ERECT (similar to Caging) when the
aircraft is stationary or in straight and level, non-accelerated
flight. If condition continues, perform FAST ALIGN (approx.
90 seconds). Initiate either action from the unit's Menu Access,
see page 10. Report to Avionics Systems if discrepancy
becomes persistent.
EXTENDED MANEUVER indication appears. The
indication will appear when a long-duration maneuver has
been sensed by the unit. See page 10.
VERTICAL SPEED appears as RED digits or AMBER
dashes. Red digits appear when the indicator reaches
or
maximum display capability. Amber dashes appear when
vertical speed exceeds measurable range of GH-3100.
Identification Screen displays "Fan Failure". This message
indicates a function failure related to the operation of the
cooling fan. The GH-3100 will continue the "Start-Up"
process, remove the message when completed, then proceed
with operation. No action is required.
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Pilot's Guide