Installation Instructions

190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
Rev. 4 Page 3-49
For all autopilots that are not listed in the GTN 6XX/7XX AML STC, select the appropriate check box as
follows:
Box [1] is checked for any installation that meets all of the following criteria:
• The GPS SELECT discrete is set to ‘Prompt’ on the Main System Config Page (refer to
Section 5.5.1.9).
NOTE
The 6XX/7XX GPS SELECT discrete output is connected to the GPS Select input (or
equivalent) on the autopilot. This input is used by the autopilot to determine if the
navigation source is GPS or VLOC. The autopilot typically goes to “wings-level” mode
automatically when the navigation source changes between GPS and VLOC. In order to
prevent the autopilot from entering “wings-level“ mode without the pilot noticing the
mode change, the unit prompts the pilot and requires pilot acknowledgement prior to
switching the output signal state. Examples of autopilots that support this input are the
Honeywell KAP 140 or KFC 225.
Box [2] is checked for any installation that meets all of the following criteria:
• The GPS SELECT discrete output is configured for ‘Auto’ on the Main System Config Page
(refer to Section 5.5.1.9).
• The 6XX/7XX interface to the autopilot provides vertical deviation information.
Box [3] is checked for any installation that meets all of the following criteria:
• The GPS SELECT discrete is set to ‘Auto’ on the Main System Config Page (refer to
Section 5.5.1.9).
• The 6XX/7XX interface to the autopilot provides no vertical deviation information (this is the
case for autopilots with LNAV and altitude hold modes only; i.e., the autopilot does not provide
vertical capture and/or vertical tracking).