Garmin G1000 System Maintenance Manual page 288

8.1 Backup Path System Testing
This final checkout tests various secondary communications paths to ensure that the paths function
correctly. Perform the following steps and verify the results of each test.
Before starting, create a simple Direct-To flight plan to an airport or other waypoint that is greater than
31 NM from the present aircraft position. Verify that the phase of flight displayed on the GPS CDI is
ENR.
8.1.1
GPS Failure Test
Step
Single GPS Failure Condition:
1. Ensure GPS satellites are acquired.
2. Place a shroud over the GPS antenna for
GIA 1 to prevent signal reception. Verify
loss of signal on MFD AUX page 4.
3. Check for desired results.
4. Remove shroud from the GIA 1 GPS
antenna and allow system to re-acquire
satellites.
5. Place a shroud over the GPS antenna for
GIA 2 to prevent signal reception. Verify
loss of signal on MFD AUX page 4.
6. Check for desired results.
7. Remove shroud from the GIA 2 GPS
antenna.
Dual GPS Failure Condition:
1. Ensure GPS satellites are acquired.
2. Cover both GPS antennas. Verify loss of
signal on MFD AUX page 4.
3. Check for desired results.
4. Remove shrouds from GPS antennas.
5. Allow both receivers to re-acquire satellite
signals before continuing.
Page 8-2
Revision 1
Desired Result
For each of the single GPS failure conditions, the
following shall remain valid on the PFD throughout
the procedure:
For a GIA1 GPS Failure, an amber BOTH ON GPS2
is displayed on PFD 1 and PFD 2.
For a GIA2 GPS Failure, an amber BOTH ON GPS1
is displayed on PFD 1 and PFD 2.
For a dual GPS failure condition, the following shall
occur:
When GPS satellites are re-acquired, verify that the
INTEG OK annunciation is given on the HSI in white
for a brief period of time then disappears.
After ~10 seconds of stable GPS position
reacquisition, verify the TAWS AVAILABLE aural
alert is given.
Verify that the system returns to normal navigation
mode (GPS CDI restored, LOI annunciation
removed, & GPS data magenta).
G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
• Attitude and Heading from AHRS.
• Airspeed, Altitude, Vertical Speed, and OAT
from Air Data Computer.
• GPS Course Deviation Indicator
• GPS CDI flags LOI on both PFDs.
• Attitude and Heading remain valid from both
AHRS on both PFDs.
• Airspeed, Altitude, Vertical Speed and OAT
remain valid from both Air Data Computers on
both PFDs.
• LOI appears on MFD Map.
• TAWS N/A aural alert & annunciation given.
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