Kcs 55A/Ka 57 Cessna 300A/Ca395A Interconnect - Honeywell BENDIX/KING KCS55 Installation Manual

RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT ELECTRONICS ASSOCIATION
BENDIX/KING
NOTES:
1. KA 57 MUST BE ABOVE SERIAL NUMBER 2050 AND MUST BE ALIGNED PER THE INSTALLATION MANUAL.
2. THE OMNI ON OR NAV ENABLE LINE TO THE KA 57 MUST BE CONNECTED SO THAT WHEN NAV IS SELECTED PIN C
OF THE KA 57 IS GROUNDED. WHEN THE AUTOPILOT IS IN THE HEADING MODE, PIN C OF THE KA 57 IS OPEN. A
PANEL MOUNTED SWITCH NEAR THE AUTOPILOT MODE CONTROLLER IS RECOMMENDED.
3. THE TRACER OSCILLATOR, I105 IN THE KA 57, MUST BE DISABLED BY REMOVING CJ101. IN EARLIER KA 57'S WITH-
OUT CJ101, REMOVE C110.
4. THE KA 57 (KCS 55A SYSTEM) WILL INTERFACE WITH CA 395A COMPUTER AMPLIFIERS THAT ACCEPT ONLY AC IN-
PUTS [P/N 42660-1 (X) (X) (X)]. THE KA 57 WILL NOT INTERFACE WITH P/N 42660-2 (X) (X) (X) COMPUTER AMPLIFIERS.
5. BECAUSE OF THE REQUIREMENTS OF THE CESSNA AUTOPILOT AND THE NORMAL OPERATING CHARACTERISTICS
OF THE KA 57 AUTOPILOT ADAPTER, THE KA 57 MUST BE MODIFIED SO THAT IT WILL WORK SATISFACTORILY WITH
THIS AUTOPILOT. THE MODIFICATION REQUIRED IS CONTAINED IN SERVICE BULLETIN KA 57-3 (P/N 600-01200-00XX).
THIS MODIFICATION REMOVES T102, THE REFERENCE AC INPUT TRANSFORMER, AND REPLACES IT WITH A CIRCUIT
JUMPER SO THAT THE AUTOPILOT REFERENCE AC WILL BE APPLIED DIRECTLY TO THE KA 57 SWITCHING CIRCUITS.
THIS WILL MINIMIZE THE LOAD REPRESENTED BY THE KA 57 AND ENSURE ITS PROPER OPERATION WITH A RELA-
TIVELY LOW REFERENCE EXCITATION VOLTAGE.
IN ORDER TO ENSURE THAT THE MODIFIED KA 57 IS PROPERLY INSTALLED TO PROVIDE THE PROPER HEADING SE-
LECT/NAV COURSE DATUM SWITCHING OPERATION WITH THE EXTERNAL SWITCH, THE INTERCONNECT MUST BE
WIRED IN ACCORDANCE TO THIS NOTE.
FIGURE 2-19 KCS 55A/KA 57 CESSNA 300A/CA395A INTERCONNECT
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©Honeywell International Inc. Do not print without express permission of Honeywell
KCS 55/55A
Rev 11, Apr/2007