What was found
PROVIDING HAZARDOUSLY MISLEADING INFORMATION TO THE FLIGHT CREW IS A MAJOR FAILURE CONDITION FOR THE AIRCRAFT. SINGLE LATENT FAILURES OF CDI DEVIATION OUTPUT WIRES (OPEN) RESULT IN A NON-FLAGGED AND CENTERED DEVIATION BAR, INDICATING AN ON-COURSELOCALIZER OR GLIDE SLOPE WITHOUT THE CAPABILITY OF DETECTING AND FLAGGING THE MALFUNCTION. A COUPLED FLIGHT DIRECTOR/AUTOPILOT WOULD CONTINUE OPERATING UNGUIDED, WITHOUT ALERTING THE COCKPIT CREW! THIS CAN BE HAZARDOUSLY MISLEADING.