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Why would certain serial number 35-F33/G33s be excluded from the Garmin GFC-500 autopilot support list?

I'm interested in installing a Garmin GFC-500 in a F33 (not F33A) but the supported list indicates Beechcraft Bonanza/Debonair Models: 33, A33, B33, C33, C33A, E33, E33A, E33C, F33*, F33A, F33C*, G33*
*Certain serial numbers excluded, see authorized Garmin installation center for details.

I've contacted two different Garmin installation centers and got two different answers. Neither could tell me why certain S/N's are excluded. So I contacted Garmin tech support for a more definitive answer but I'm still waiting for their reply.

Does anyone know why or have ideas why certain serial number F33/G33s are excluded but not all F33/G33s? This is puzzling me since earlier A33, C33, E33 and later F33A models are on the supported list...

Model: Bonanza F33
Posted 4/16/2021 - 6 months ago
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FYI - I heard back from Garmin sales support (masked response below), and unfortunately 35-F33/G33's with serial numbers CD-1235 thru CD-1243 are indeed excluded from the GFC-500 AML due to "significant changes prior to S/N CD-1244".

If someone definitively knows and can illustrate that no significant changes exist between F33 S/N CD-1243 and F33 S/N CD-1244, please let me know and I will pass along to the info to Garmin to ask that these currently excluded aircraft can be added to the GFC-500 AML.

garmoin gfc-500 masked.png - 176.4 KB

Posted 4/16/2021 - 6 months ago
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Quote

Why would certain serial number 35-F33/G33s be excluded from the Garmin GFC-500 autopilot support list?