TM  5-5420-209-12 Table 4-3. Unit Preventive Maintenance Checks and services (PMCS) for the interior Bay cont. Item Interval Location Item to Item To Be Inspected Equipment Is Not Service/Check Procedure Ready/Available If 39 Monthly    Lower  Lock Inspect screw and threads for cracks, burrs, Screw will not extend or Drive nicks  and  deformation. retract drive pin properly. Inspect  trunions,  and  drive  pin  for  cracks. Cracks  or  broken  welds Inspect cover bumpers and supports for noted. broken welds and deformation. 40 Monthly Support  Links Inspect for broken welds, cracks and Broken  welds  noted. deformation. 41 Monthly Lifting  Eye Inspect for cracks and elongation of eye. Any  cracks  noted  or  eye (Rear) elongation  equals  25% of original circumference. NOTE Cable,  when  adjusted correctly, will be taut NOT tight. 42 Monthly    Unfolding  Cable    Check  cable  adjustment. Cable out of adjustment. Assembly Inspect  for  kinks,  frayed  or  broken  strands, Kinks  frayed,  broken, compressed  or  flat  areas. compressed  of  flat surface  areas  noted. 43 Monthly    Cable  Guide Inspect  for  cracks,  gouges,  jagged  protrusions, Eye  cracked,  elongated erosion  or  surface  area  and  elongation  of  eye. more than 0.50 at upper arc or aluminum eroded to within .050. 44 Monthly    Unfolding  Cable    Check  cable  adjustment. Cable out of adjustment. Assembly Inspect  for  kinks,  frayed  or  broken  strands, Kinks  frayed,  broken, compressed  or  flat  areas. compressed  of  flat surface  areas  noted. 45 Monthly Lower  Lock Inspect screw and threads for cracks, burrs, Screw will not extend or Drive nicks  and  deformation. retract drive pin properly. Inspect  trunions,  and  drive  pin  for  cracks. Cracks  or  broken  welds Inspect cover bumpers and supports for noted. broken welds and deformation. NOTE To  inspect  the  following  items properly, bay must be unfolded (on ground or in water). 4-23 No.