PURGING OF FUEL TANK WITH INERT GAS
When using a fire extinguisher as
a source of CO2 for purging fuel
tanks, remove fiber horn. Ground
nozzle as well as bottle itself to
aircraft. Discharge CO2 slowly to
avoid generating static electricity and
allowing rapid CO2 expansion which
could damage the cell.
The size of CO2 bottle used can
vary to meet existing conditions, with
15 pound size handy to use. Total
amounts recommended are based
on quantities usually needed, but
more may be needed to obtain a safe
reading on combustible gas indicator.
Nitrogen or other inert gas may
be used instead of CO2. Carefully
observe above precautions.
Procedure is same to purge any fuel
tank. No. 1 (left) main fuel tank
purging is shown here.
Make sure that tank vent (1) is clear of
obstructions and plugs, and that tank drain
valves (2) are installed and closed.
While purging, each person shall
wear protective clothing, a respirator,
a full facepiece and rubber gloves.
Perform the purging operation in an
area isolated from personnel not
concerned with purging.