System Power Up - Garmin G500H Pilot's Manual

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System Power Up

NOTE: See the Aircraft Flight Manual (AFM) for specific procedures
concerning avionics power application and emergency power supply
operation.
NOTE: Refer to Section 6 for system-specific annunciations and alerts.
The G500H System is integrated with the aircraft electrical system and
receives power directly from electrical busses. The GDU 620 and supporting
sub-systems include both power-on and continuous built-in test features that
exercise the processor, memory, external inputs, and outputs to ensure safe
operation.
During system initialization, test annunciations are displayed. All system
annunciations should disappear typically within the first 30 seconds after power-
up. Upon power-up, bezel key backlights also become momentarily illuminated
on the GDU 620 display bezel.
On the PFD, the AHRS begins to initialize and "AHRS ALIGN: Keep Wings
Level" is displayed. The AHRS should display valid attitude and heading fields
typically within the first minute and a half after power-up. The AHRS can align
itself during level flight.
NOTE: Fastest AHRS alignment is achieved with the aircraft stationary
and with all AHRS inputs valid (3-D GPS position, magnetometer, and
air data). During initial power up on the ground, no GPS position and/or
magnetic anomalies are common. If the aircraft is taxied prior to AHRS
alignment, alignment may be delayed until after a valid 3-D GPS position
is available.
NOTE: During in-flight alignment of the AHRS, minimize aircraft
maneuvering. The AHRS will align with shallow banking and pitch angles
(less than 20 degrees of roll or 5 degrees of pitch). AHRS alignment may
not be possible during more aggressive maneuvers.
190-01150-02 Rev. J Garmin G500H Pilot's Guide
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