TM  5-5420-209-12 Table 4-3. Unit Preventive Maintenance Checks and Services (PMCS) for the Interior Bay Cont. Item No. 12 13 14 15 16 17 18 19 20 Interval Weekly Weekly Weekly Weekly Weekly Weekly Weekly Weekly Weekly Location Item to Sewice/Check Bridge  Latch Travel Latch Travel Latch Receptacle Bridge  Latch Skin  Surface Foldlock  Latch Skin Surface Unfolding Mechanism Bridge Latch Receptacle Item To Be Inspected Inspect brackets, supports and pins for cracks, broken welds and deformation. Inspect  springs  for  deformation  and  stretching. Inspect brackets, supports and pins for cracks, broken  welds  and  deformation. Inspect  springs  for  deformation  and  stretching. Inspect brackets, shims and strike catches or cracks, broken welds, binding and deformation. Inspect brackets, supports and pins for cracks, broken welds and deformation. Inspect  springs  for  deformation  and  stretching. Inspect surface area for punctures, holes and dents  exposing  interior  ribs. Inspect  seams  for  cracked/broken  welds. Inspect brackets, supports and pins for cracks, broken  welds  and  deformation. Inspect  springs  for  deformation  and  stretching. Inspect surface area for punctures, holes and dents  exposing  interior  ribs. Inspect  seams  for  cracked/broken  welds. Ensure unfolding mechanism functions properly. Inspect cover plate, spring pins, pins, lever, and connecting link for cracks, broken welds and  deformation. Inspect brackets, shims and strike catches for cracks, broken welds, binding and deformation. Equipment Is Not Ready/Available If Cracks,  broken  welds noted or deformation causes  binding. Springs  stretched. Cracks,  broken  welds noted or deformation causes  binding. Springs  stretched. Broken welds, binding or deformation  prevents engaging latch noted. Cracks,  broken  welds noted or deformation causes  binding. Springs  stretched. Any damage which allow water into bay interior (If in doubt, perform soap bubble  test). Cracked/broken   welds noted. Cracks,  broken  welds noted or deformation causes  binding. Springs  stretched. Any damage which allow water into bay interior (If in doubt, perform soap bubble test). Cracked/broken  welds noted. Broken welds noted or deformation   prevents mechanism for functioning properly. Broken  welds,  binding  or deformation   prevents engaging latch noted. 4-20 Procedure