46-31-02 STINSON: (Was Service Note 1 of AD-764-1.) Applies to All L-5 Series Aircraft.
After each 25 hours of operation make a visual inspection of the torque tube on welded bellcrank assemblies located in the fuselage immediately aft of the rear seat for cracks in the bellcrank around the torque tube. If any cracks are found, replace or reinforce part before further operation of the aircraft. Bellcranks manufactured from a casting and installed on L-5 airplanes, Serial Number 42-98885 and subsequent, are considered satisfactory. If inspection indicates that this more satisfactory part is installed, the 25-hour inspections may be discontinued.