Instruction Manual

G1000 / GFC 700 System Maintenance Manual - 200/B200 Series King Air Page 5-23
190-00915-01 Revision 9
Invalid Data Field
Associated
LRU(s)
Solution
ATTITUDE FAIL
GRS 77 or
GRS 7800
• Ensure that a cell phone or a device using cell phone
technology is not turned on (even in a monitoring
state) in the cabin.
• Cycle GRS 77 or GRS 7800 power to restart
initialization.
• Ensure GRS 77 or GRS 7800 connecter is secure
and proper wire harness strain relief is provided.
• Ensure the GRS 77 or GRS 7800 is fastened down
tightly in it’s mounting rack and that the mounting
rack is not loose (CAUTION - do not loosen the
mounting rack hardware to the airframe shelf or the
aircraft will need to be re-leveled and the
PITCH/ROLL OFFSET procedure performed).
• Ensure GPS has acquired at least four satellites, has
a 3D navigation solution, and a DOP of less than 5.0.
This is particularly important for an ATTITUDE FAIL
that appears during ground operation only.
• Perform an Engine Run-Up Test to check if engine
vibration is causing the GRS 77 or GRS 7800 to go
offline.
• Load configuration files to the PFD, MFD, GIA1, and
GIA2.
• Calibrate the GRS 77 or GRS 7800 (Pitch/Roll Offset
and Magnetometer Calibration).
• Replace GRS 77 or GRS 7800.
9 If problem persists replace GRS 77 or GRS 7800
configuration module.
9 Contact Garmin Aviation Product Support if
condition continues after replacing the GRS 77 or
GRS 7800 and config module for additional
assistance.