Section 3 3-1 Through - Garmin GPS 400W Installation Manual

For all autopilots that are not listed in the 400W/500W Series AML STC, select the appropriate limitation
as follows:
Limitation [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
5.3.3. in the appropriate installation manual).
The 400W/500W Series 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.
Limitation [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 5.3.3. in the appropriate installation manual).
ARINC 429 GPSS provided directly to the autopilot computer or through a roll-steering
converter.
The 400W/500W interface to the autopilot provides vertical deviation information.
Limitation [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
5.3.3. in the appropriate installation manual).
GPS roll-steering information is not provided to the autopilot computer.
The 400W/500W interface to the autopilot provides vertical deviation information.
Limitation [4] 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
5.3.3. in the appropriate installation manual).
The 400W/500W 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).
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NOTE
400W Series Installation Manual
190-00356-02