Category: navion, throttle, control
Applicability: All Models Having Serial Numbers 1789 - 2019; 2021- 2026, 2028 - 2142, 2144 - 2169, 2171- 2177, and 2180.
Supersedes: n/a
Compliance: Must be installed by July 15, 1951
Procedure: It has been found that on some of these airplanes throttle housing slippage has occurred at the point where the cable housing is swaged to the ferrule at the instrument panel end. This slippage can result in erratic throttle operation. An inspection of these controls for evidence of housing slippage must be made not later than March 5, 1951. Any control showing evidence of slippage shall be replaced immediately. It has been found that housing slippage may be caused by the inner shaft in the control head striking the end of the housing when the throttle is moved to the full open position. To prevent such occurrence, a special stop nut must be installed on the throttle shaft in place of the existing jam nut. This special nut, which will prevent the inner shaft from striking the end of the housing, is being furnished by the Ryan Co.
Notes: Ryan Field Service Bulletin No. 9, dated September 1, 1950, covers this same subject.
AD-51-07-01