AD2020-18-51 Prompted By A Report Of Three Failed Attitude Indicators

Emergency Airworthiness Directive (AD) 2020-18-51 is sent to owners and operators of various aircraft with Sandia attitude indicator (attitude indicator) part number (P/N) 306171-10 or 306171-20 installed. These attitude indicators may be marked as BendixKing Model KI-300 or Sandia Model SAI-340A. This emergency AD was prompted by a report of three failed attitude indicator P/N 306171-10 units. Following the initial report, investigation has revealed a total of 54 failed attitude indicator P/N 306171-10 units. Attitude indicator P/N 306171-20 is affected by the same unsafe condition because it is identical to P/N 306171-10. The effect of the failure was erroneous attitude data p