Quantcast f. VEHICULAR  ANTENNAS  (AS-3900)

 
  
 
TM   11-5820-890-20-1 5.3.  COMPONENT  REPAIR.  Continued f. VEHICULAR  ANTENNAS  (AS-3900)  (AS-3916  is  not  repairable): MAINTENANCE    REQUIREMENT: ACTIONS: (1)     Replace/clean/lubricate (1) Remove  RF  cable  (6)  from  antenna  subassembly antenna  elements  (1,  2) (AS-3916  does  not  disassemble) (2) Cut safety wire (3) (3) Unscrew  antenna  from  antenna  base (4) Unscrew  upper  and  lower  antenna  elements  (1,  2) (5) Clean,  lubricate  with  silicone  compound,  or  replace  as  appropriate (6) Install  antenna  elements  (1,  2) (7) Install  safety  wire  (3) (8) Install  RF  cable  (6)  to  antenna  subassembly (2) Replace  antenna  subassembly  (4) (1) Remove  antenna  elements  (1,  2) (2) Remove  4  bolts,  with  2  washers  each,  and  4  nuts  from  antenna  base and  bracket (3) Remove  ground  strap  (7)  from  antenna  subassembly (4) Remove  gasket  (5)  and  replace  if  required (5) Install  good  gasket  on  top  of  mounting  bracket (6) Position  good  antenna  subassembly  on  mounting  bracket  and install  ground  strap  (7) (7) Coat  all  washers  with  Type  Ill  RTV  compound (8) Install  washer  on  each  of  4  bolts (9) Install  4  bolts  in  base (10)  Install  washers  and  nuts  and  tighten (11)   Install   antenna   elements (3)  Replace  ground  strap (1)  Remove  antenna  subassembly (2) Remove  ground  strap  (7)  from  antenna  mounting  bracket (3) Install  ground  strap  (7)  to  antenna  mounting  bracket (4)  Install  antenna  subassembly 5-21

 


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