AvMap Ultra EFIS User And Installation Manual page 21

AvMap Ultra EFIS
GPS failure
During the Ultra EFIS start-up and until a GPS fix is acquired, the GPS position field
on the HSI display will indicate GPS error in RED. If the GPS fails during operation, the
same condition is indicated. The unit can continue calculating position with degraded
precision in absence of GPS.
What to do?
Allow for some time (up to 3 minutes) for the GPS to acquire first fix. If failure persists
after this point, verify GPS antenna connection.
AHRS failure
When the PFD display mode becomes totally RED there is a AHRS failure. This failure
occurs when the unit exceeds any of the following limits: 1600deg/s (all axis) and 8g
(all axis).
What to do?
This failure should only occur during high dynamics in flight. The unit will accumulate
error in the attitude estimation during these high dynamic conditions, but this error is
automatically reduced and eliminated even on dynamic conditions (provided limits are
not continuously exceeded). If this failure occurs in non-high dynamic conditions, unit
requires service.
Altimeter failure
When the altimeter in the unit is either out of range or not operating correctly the
altimeter tape becomes RED.
What to do?
If the altitude is within the limits of the unit (as quoted in the specifications), check for a
static port blockage. If the static port is not obstructed, the unit requires service.
Transponder failure
When there is no communication between the transponder and the Ultra EFIS the
Transponder box on the PFD page becomes RED.
What to do ?
Verify wiring and EFIS configuration.
Unit failure
When the PFD and HSI display modes show a RED cross the system is not operative.
This failure indicates that the sensor system on the unit is no longer speaking to the
symbol generator CPU.
What to do?
This problem can occur because the unit is configured wrong, because the software
User and Installation Manual - 21