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7.21 Longitudinal cyclic trim link for security
7.27 Inspect forward transmission oil cooler impeller installation.

TM-55-1520-240-PM CH-47D Heilcopter Manual
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TM 55-1520-240-PM PHASE NO. _____ Area Name and No. Aircraft Serial No. Date FORWARD ROTOR, CROWN, AND TUNNEL, AREA #7 Inspect Phase No’s Inspection Requirements Status Faults and/or Remarks Action Taken Initial ALL/C 7.23 Forward transmission upper cover, mount lugs, mounting hardware, and adjacent structure for security, buckling, cracks, and corrosion. Transmission torque box structure for twisting, buckling, cracks, damage, and loose or missing rivets. Access 30, 72 ALL/C 7.24 Upper boost servocylinders for leaks and security, chafing or interference with adjacent structure components.  Support fittings for wear, damage, and cracks. Adjacent structure for cracks, buckling, and loose or missing rivets. Bearings and bushings for condition, radial and axial play. ALL/C 7.25 Drive arms and collar for excessive wear at hinge points. Bearings for frayed or unbonded liners. Access 30, 72 ALL 7.26 Forward transmission oil cooler mount flanges for cracks. Hardware for security. Access 30, 72 "FOD REMINDER" Check work area for tools and parts after completion of maintenance and inspection. 2-49







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