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Before you open the S-TEC 55x Installation Manual (PN 87343, Rev J or later), you must understand what you are installing. The manual divides the system into five core components:
Modern installations often include the GPSS converter module. This allows the autopilot to fly "Great Circle" routes defined by the GPS, providing smoother transitions and turn anticipation than standard VOR deviation tracking.
: Must use shielded wire where indicated; grounding must occur only at specified points to prevent interference.