Help & Advice on an avionics upgrade path

[Dan schultz]

Using an original 400A autopilot I believe is not authorized with the Garmin WAAS navigators for LPV approaches. My understanding is the 400B is approved for LPV.

Dan

[hayesjaj]

Originally Posted by Dan schultz

Using an original 400A autopilot I believe is not authorized with the Garmin WAAS navigators for LPV approaches. My understanding is the 400B is approved for LPV.

Dan

Source for this? First I have heard of it.

[Dan schultz]

The 400A can be used for LNAV minimums, however, LPV minimums, are not authorized. Attached is a page out of the 530W installation manual rev E.

Dan

[hayesjaj]

Originally Posted by Dan schultz

The 400A can be used for LNAV minimums, however, LPV minimums, are not authorized. Attached is a page out of the 530W installation manual rev E.

Dan

Interesting! I have Rev K of same manual and it does not have that limitation. Nor does it have most of the autopilot interconnect diagrams.

[Dan schultz]

My Rev M. Manual has the same info.

Dan

[JimC]

"Note: Contact Garmin to remove VNAV limitations."

[Dan schultz]

Talking with Billy today, engineer at Garmin, we can’t get LPV minimums with the 400A autopilot, LNAV minimums only. The 400B that is approved is a different animal compared to the 400A.

Dan