TM    55-4920-428-13 Procedures Equipment  Is Item Interval Item  to  be Check  for  and  have  repaired Not   Ready/ No. B D A Inspected or  adjusted  as  necessary Available   If: 1 Case and Clean exterior, using cloth. 2 3 4 5 6 6. 1 7 8 9 11 cover For stubborn dirt, use cloth damp with cleaning solvent. Nameplate Condition,  legibility. Handles Condition, secure mounting, positive  closure. Latches Condition, secure mounting. Air valve Cleanliness, operation. Cables Insulation for condition. Repair damaged insulation using  tape.  Connector shells for condition. Re- place cable if shell is damaged.  Contacts  for cleanliness.  Clean  as required. Straighten bent pins. Aluminum box for damage which  interferes  with  use. Receptacle pins for straightness and cleanliness. Clean or straighten pins as required. Binding posts for thumb nuts and condition of thread. Adapter Panel Clean, using paint brush. For stubborn dirt, use cloth damp with cleaning solvent. Receptacles Straightness  of  pins. Straighten bent pins. Control Tight on shaft. Tighten knobs setscrew if necessary. lights place if damaged. Meters and Condition, secure mounting. gage Check glass for cracks. 12 Variable resistors Smooth  operation.  Secure (controls) mounting. Tighten loose controls. 13 Elapsed Appropriate change since time last  check. indicator Damage  exceeds bent pins. Glass is cracked. Control operation is rough or erratic. 2-22 Change   1