TM  11-6625-3081-23 1-15. DESCRIPTION OF TEST PR0GRAM SETS (cont) 1-15 j. TEST FIXTURES Test  fixtures  provide  additional  capabilities  of  interfacing  the  UUT  to  the  test equipment. They  provide  mechanical  handling/mounting  capabilities  and  additional electrical  Interfacing  beyond  that  of  the  other  interface  devices. In some cases critical  alignments  are  attained  merely  by  bolting  the  fixture  on  the  test  equipment and then mounting the UUT onto the fixture,   which  is  keyed  for  precise  alignment. The test fixtures required for direct support maintenance are listed below. For individual  descriptions  refer  to  the  corresponding  paragraph  number. Paragraph (1) (2) (3) (4) (5) (5.1) (6) (7) (8) (9) (lo) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22) (23) (24) (25) (26) (27) (28) (29) (30) (31) (32) (33) (34) (35) (36) (36.1) (37) Name Part No. Radiometer   assembly 13081475 Deleted MTF  target  mount 13081927 Deleted Insert/adapter  assembly  (TADS  NSA) 13082064-29 Insert/adapter assembly (day sensor subassembly) 13082064-49 Azimuth  gimbal  alignment  assembly  tool Deleted Terminal  box  assembly Deleted Fiber  optic  adapter  assembly HOD  and  IVD  optical  alignment  assembly HOD  bracket  assembly Deleted Illuminator  fiber  optic  assembly Upper  IVD  protective  cover  assembly HOD  brackets  captive  screw Lower  IVD  protective  cover  assembly IVD  optical  alignment  reticle  assembly HOD  protective  cover  assembly Optical  alignment  reticle  assembly Nightside  alignment  tool  assembly Electro-optical  mask  and  window  assembly Mask  assembly Deleted Deleted HOD  mounting  bracket  assembly Channel  balance  adapter  assembly Insert/adapter  assembly  (PNVS  NSA) Deleted Retroreflector   assembly Deleted Light  source  assembly Line-of-sight  laser  housing  assembly Deleted Deleted HOD  interlock  protective  cover  assembly Shroud  grounding  set Deleted 13082292 13082747 13083077, 13083077-29 13083078-39 13083082 13083098 13083110 13083111 13083114 13083115 13083117 13083119 13083129 13083136 13083157 13083489-29 13083603-19 13082064-39 13083952 13083956 13083958 13230921 13231057 1-101 Change 18