Garmin GDL 69/69A Installation Manual - page 43

System Configuration/Checkout 

GDL 69/69A Installation Manual 

Page 4-1 

190-00355-02  

Revision E 

4 SYSTEM 

CONFIGURATION/CHECKOUT 

4.1 Post-Installation 

Power 

Check 

Move the aircraft outside and ensure that there is an unobstructed view of the Southern sky.  Attach a 

ground power cart to the external power connector on the aircraft and apply power. 

NOTE 

Use of an external power cart is optional in order to prevent the aircraft battery from 

discharging to a critically low level. 

Power on all systems and allow two to four minutes for initialization.  Verify that the control/display unit 

and the audio panel are connected, and operating properly.  Ensure the circuit breaker for the GDL 

69/69A is closed. 

4.2  Initialization of Configuration Module 

The GDL 69/69A requires aircraft installation information to be stored in the configuration module.  

For MX20 and 400/500 series units the configuration module is installed in the back panel connector 

backshell assembly and the only parameter stored in the configuration module is the variable attenuator 

value needed to obtain the required GDL 69/69A gain/loss component. 

For installations with the GDU 104x, the configuration information is stored with the G1000 avionics 

system. Therefore the configuration module is not installed in the GDL 69/69A connector backshell. For 

installations with the G1000 avionics system, the configuration information contains the variable 

attenuator value and may contain several other parameters. 

NOTE 

The GDL 69/69A does not provide proper operation until the configuration initialization 

procedure is completed.  

4.2.1  Configuration Module Procedure for Installation with MX20 

Refer to the latest revision of the MX20 Installation Manual (Garmin AT Part Number 560-1025-(  )) for 

instructions.