TM 1-1520-238-PM 2–66 C1 PHASE NO. Date Aircraft Serial No. Area Name and No. MAIN TRANSMISSION – 9 Inspect Phase Nos. Initial Action Taken Faults and/or Remarks Status Inspection Requirements 2,4 20. Flight control servocylinders for leakage, cracks, or corrosion. Upper and lower C rod ends for bearing damage and security. Inspect servocylinder control linkage fasteners for damage, corrosion, and security. Access L200, R200 2,4 21. Inspect and clean flight control servocylinders pressure filter. C Access L200, R200 ALL 22. Main rotor mast support struts for cracks, bending, distortion, and security. C Transmission deck for distortion or looseness at lower ends of struts. Access L200, R200 ALL 23. Mast base for cracks, distortion, and security. Mast support mount and upper C ends of support struts for looseness. Inspect the upper portion of the mast base support in the areas around the four lightening holes, mast and mixer supports for corrosion and pitting. Access L200, R200 “FOD REMINDER” Check work area for tools and parts after completion of maintenance and inspection.