TM 10-6640-239-13 B-9 SECTION II.  MAINTENANCE ALLOCATION CHART FOR MODULAR BASE LAB – Continued (1) (2) (3) (4) Maintenance Level (5) (6) Unit Direct Support General Support Depot Tools and Equipment Ref Code Remarks Code Group Number Component Assembly Maintenance Function C O F H D 37 Oxygen and Nitrogen Gas Supply Lines Inspect Remove/Install .1 .7 1 37 Gas Cylinder and Gas Regulator Valve Inspect Remove/Install .1 .3 1 38 Laboratory Oven Inspect Remove/Install Calibrate .1 .2 1.0 1, 2 A 40 Explosion Proof Refrigerator Inspect Remove/Install .1 .6 1 A 41 Sulfur Apparatus and Water Bath Inspect Remove/Install Calibrate .1 .5 1.0 1, 2, 3 A 46 Fume Hood Exhaust Blower Hoses Inspect Remove/Install .1 .1 1 47 Power Distribution Module Components Inspect Remove/Install .5 1.5 1