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The airworthiness directive
51-26-02 LEAR: Applies to All L-2 Series Automatic Pilots.
Compliance required at next 100-hour airplane inspection, but not later than January 1, 1952.
Inspect all L-2 Series autopilot servos to determine whether servo clutches have green dot on the shaft at the output end of servo capstan shaft, or a green dot on or below the servo nameplate, or a yellow dot on the clutch housing. All clutches not so marked must be replaced. Replacement clutches will be supplied by Lear upon request.
(Lear Service Bulletin No. L-2-16 dated October 26, 1951, covers this same subject.)
This applies only to Servo Models 121C, 121D, 121F, 121G, 121H, 121J, manufactured prior to March 1, 1952. Reference Lear Service Bulletin No. L-2-44, dated May 24, 1954.