TM  55-1520-240-23-8 10-2 PURGING  OF FUEL TANK WITH  INERT GAS 10-2 INITIAL  SETUP Applicable  Configurations: All Tools: Combustible  Gas  Indicator CO₂,  Technical  50  Lb.   Cylinder Rubber Gloves Respirator Faceshield Protective  Clothing Materials: None Personnel  Required: Medium  Helicopter Repairer References: Task  10-3 Equipment  Condition: Battery Disconnected  (Task  1-39) Electrical  Power  Off Helicopter  Grounded  (Task  1-29) Fuel Tank Defueled  (Task 10-34  or 10-35) General  Safety Instructions: All  regulations  and  instructions for handling  fuels  shall  be  strictly observed. 10-24