The FCS-810 was a Bendix product and was offered by Beech as a factory installed autopilot in Bonanzas and Barons in the '70s. It is a two axis autopilot with VOR/ILS coupling, similar in features to the Century IV autopilot that Beech also offered during that period of time. The FCS 810 is a great autopilot that can be repaired easily. Call Autopilots Central and discuss your problem. Barry Sparks, the owner, will walk you through diagnostic test and if needed will tell you what to send in for repair.
$491.97 Buy It Now 5d 13h, $12.63 Shipping Estimate,, Seller: (8,857) 99.5%, Location: Fort Worth, Texas, Ships to: Worldwide, Item: 91 8000 to 9000 avionic items in this eBay store. This eBay item is: Bendix FCS-870 Maintenance Manual, covers CA-871A, FC-872A, MA-872, AD-873A, SA-873, SE-873, ST-873, SR-874 & TS-870A The items are as they come from the closed aircraft stores we acquire. This item is used equipment and we are selling this item without warranty or return. DISCLAIMER OF WARRANTY: We are selling this item “As Removed, As Is, Where Is, Make Offer'. We do not provide any warranty of this item whatsoever, whether express, implied, or statutory, including but not limited to, any warranty of 'merchantability' or 'fitness for a particular purpose' or any warranty that the contents of the item will be error-free. We are not liable for any damages, including, but not limited to, direct or indirect, special, or consequential damages arising out of, resulting from, or any way connected to the use of the item, whether or not based upon warranty, contract, tort, or otherwise; whether or not injury was sustained by persons or property or otherwise; and whether or not loss was sustained from, or arose out of, the results of, the item, or any services that may have been provided by us.
We are not responsible for direct, indirect, incidental or consequential damages result from any defect, error, or failure to perform. Attiny13 software uart bascom download. Condition: Used, Part Brand: FCS-870, Warranty: No See More. 
:: Part No.: BXFCS810-F-C SKU: 502:R Condition Code: Flight Manual Supplement 10 FAA Approved 1972 Revised December, 1974 Available Media Printed Copy Download CD / DVD Quantity: Part No.: IB-2810 SKU: 503:R Condition Code: Installation Manual Available Media Printed Copy Download CD / DVD Quantity: Part No.: I.B.