TM  5-5420-209-12 Table 4-3. Unit Preventive Maintenance Checks and services (PMCS) for the Inteterior Bay cont. Item Interval Location Item to Item To B. Inspected Equipment Is Not No. Service/Check Procedure Ready/Available If 5 weekly Skin Surface Inspect surface area for punctures, holes and Any damage which allow dents  exposing  interior  ribs. water into bay interior (If in doubt, perform soap bubble test). Inspect  seams  for  cracked/broken  welds. Cracked/broken   welds noted. 6 Weekly Tie Down Pin Inspect pin weld seams for broken welds. Broken  welds  noted  or Inspect pin for erosion of pin surface. erosion  of  surface  area prevents  securing  bay  to transporter. 7 Weekly Bridge  Latch Inspect brackets, shims and strike catches for Broken welds, binding or Receptacle cracks, broken welds, binding and deformation  prevents deformation. engaging  latch  noted. 8 Weekly Unfolding Ensure unfolding mechanism functions Broken  welds  noted  or Mechanism properly. deformation  prevents Inspected cover plate, spring pins, pins, lever, mechanism  for and connecting link for cracks, broken welds functioning  properly. and deformation. 9 Weekly Skin Surface Inspect surface area for punctures, holes and Any damage which allow dents  exposing  interior  ribs. water into bay interior (If in doubt, perform soap bubble test). Inspect  seams  for  cracked/broken  welds. Cracked/broken   welds noted. 10 Weekly Foldlock  Latch Inspect brackets, supports and pins for cracks, Cracks,  broken  welds broken welds and deformation. noted or deformation causes  binding. Inspect  springs  for  deformation  and  stretching. Springs  stretched. 11 Weekly Skin Surface Inspect surface area for punctures, holes and Any damage which allow dents  exposing  interior  ribs. water into bay interior (If in doubt, perform soap bubble test). Inspect  seams  for  cracked/broken  welds. Cracked/broken   welds noted. NOTE Ensure latch and receptacle are  adjusted  property  (latch "T"  rests snugly against strike catch  of  corresponding receptacle). 4-19