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P1
on / off
4.2.1.10
Service Command
The Service command causes service information to be returned. It is useful for troubleshooting system
failure or malfunction.
>service
4.2.1.11
Version Command
The Version command displays version numbers of the Application software, Main I/O Board FPGA, Rx
Logic FPGA, PLD, Micro APM software, Radio-controller software and GPS Engine software.
>version
4.2.2
MX20
SETUP
If the GDL 90 is used in conjunction with a Garmin MX20 Multi-function Display, the MX20 should be
configured accordingly. For instructions, refer to the MX20 User Guide (Part No. 560-1026-06 or later
FAA-approved revision), which is included in the GDL 90 Product CD.
4.3 E
QUIPMENT
4.3.1
S
YSTEM
The GDL 90 executes a self test at power-up to verify the unit operation as well as other internal
functions. Failures and system status are recorded and communicated via 6 LEDs in the front of the unit.
Verify that the unit does not display a failure indication when turned on.
The GDL 90 must be properly configured prior to performing system checkouts. When configured
correctly, the GDL 90 will annunciate failures that are detected with interfacing systems when it is first
turned on. Any annunciated failures should be corrected prior to proceeding with the ground checks
4.3.1.1
GPS Navigation Checkout
Following configuration of the APM, the aircraft should be moved to a location with an unobstructed
view of the available GPS satellites. A computer must be connected to the maintenance port to verify
position and signal strength information.
Check the GPS operation as follows:
1. Connect a computer to the 9-pin maintenance port connector (Refer to Section 4.2.)
2. Turn on the GDL90 and allow the unit to acquire a position. Verify that the GPS LED on the front
of the GDL 90 stops blinking and remains steadily lit within 20 minutes of power-on, indicating
unit has acquired a 3-D fix. All other avionics should be turned off for this part of the test.
GDL 90 Installation Manual
Description
ON – display the number of good message received in last second
OFF – turn off the display of the number of good messages
O
PERATIONAL
C
– G
HECKOUT
ROUND
560-1049-00 Rev B
Post-Installation Configuration & Checkout
/F
T
UNCTIONAL
C
HECKS
EST
4-7
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