Garmin G3X Touch, Руководство по обслуживанию

Страница: 103 / 134

Maintenance Manual 190-02472-02
G3X Touch EFIS Part 23 AML STC Revision 2
Page 93
8.3.2 GPS Receiver COM Interference Test
NOTE
GPS Status may also be monitored on the Info page in normal mode. The signal
strength bars are a real-time representation of GPS signal strength which may be
useful for troubleshooting a failed COM interference test.
This test must be conducted outside, as the use of a GPS repeater inside a hangar may result in a failed
test. After the preceding signal acquisition test has been completed successfully, perform the following
steps:
1. Apply power to the aircraft and G3X system and allow systems to initialize and the G3X system
and/or GPS navigator (if installed) to acquire sufficient satellites for a GPS solution.
2. On the MFD (in dual GDU installations) or on the multi-function pane in split format mode (in a
single GDU (PFD) installation); navigate to the info page to view the GPS status.
3. Monitor GPS status on the Main Page. Possible GPS status indications include:

No Antenna

Autolocate

Lost GPS Fix

2D GPS Fix

3D GPS Fix*

Searching the Sky

Acquiring

No GPS Fix

2D Differential

3D Differential*
*Indicates valid GPS position fix for this test
4. Select 121.150 MHz on the COM transceiver.
5. Transmit for a period of 30 seconds while monitoring GPS status.
6. During the transmit period, verify that GPS status does not lose a valid GPS position fix on the
Main Page in configuration mode.
7. Repeat steps 3 through 5 for the following frequencies:

121.175 MHz

121.200 MHz

131.250 MHz

131.275 MHz

131.300 MHz
8. Repeat steps 3 through 6 for other installed COM transceivers if applicable.
9. If an installed COM supports 8.33 MHz channel spacing, repeat steps 3 through 5 while
transmitting for a period of 35 seconds, for the following frequencies:

121.185 MHz

121.190 MHz

130.285 MHz

131.290 MHz
10. Repeat step 8 for other installed COM transceivers supporting 8.33 MHz channel spacing if
applicable.
This COM interference test should be repeated if a second GDU is installed in the aircraft and paired with
GPS antenna.