TM 1-1520-238-23 B-44 Change 3 (1) (6) (5) (4) (3) (2) MAINTENANCE LEVEL GROUP NUMBER REMARKS CODE TOOLS & EQUIP REF CODE DEPOT (D) AVIM (F) AVUM (O) MAINTENANCE FUNCTION COMPONENT/ASSEMBLY 021903 FIRE EXTINGUISHER INSTALLATION REPAIR 0.1 376 021904 SCUFF PLATE INSTALLATION REPAIR 0.4 376 021905 SCUFF PLATE INSTALLATION REPAIR 0.4 376 021906 MIRROR INSTALLATION REPAIR 0.1 376 021907 PLATE INSTALLATION, MOUNT SSU REPAIR 0.9 376 021908 MOUNT INSTALLATION REPAIR 2.9 376 021909 SUPPORT ASSEMBLY REMOVE 1.8 376 INSTALL 1.8 REPAIR 0.3 021910 BASE ASSEMBLY REMOVE 1.8 376 INSTALL 1.8 REPAIR 0.3 021911 BASE ASSEMBLY REMOVE 1.8 376 INSTALL 1.8 REPAIR 0.3 021912 PLATE SUPPORT INSTALLATION REPAIR 1.9 376 021913 MASK POUCH INSTALLATION REPAIR 0.1 376 021914 BORESIGHT MOUNT INSTALLATION REPAIR 0.2 376 021915 THERMAL INSULATION REMOVE 0.2 27, 154, INSTALLATION INSTALL 0.2 262, 284, REPAIR 2.6 377 021916 HOLSTER INSTALLATION REPAIR 0.2 376 021917 FOOT GUARD, SEAT, AIRCRAFT REPAIR 1.0 376 D, I, J, U