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Chapter 4. ORGANIZATIONAL MAINTENANCE INSTRUCTIONS - TM-5-4220-201-120032
Inspection Procedure (90-120-Day Inspection) (Cont) - TM-5-4220-201-120034

TM-5-4220-201-12 Life Preserver Underarm Parachutist Type B-7 Coinflated FSN 4220- 657-2197 Manual
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TM 5-4220-201-12
4-2. Inspection Procedure (90-120-Day Inspection)
To perform these inspections, remove the flotation cells (fig. 1-5) from
the containers, and visually inspect the containers for loose stitching,
oil, and grease spots. Perform a leakage test and visual inspection of
the flotation cells as follows: recording room temperature at the start of
the test.
WARNING
Do not inflate flotation cells rapidly.
a. Attach the mechanical inflation system to the mouth inflation
valve (fig. 2-7). Be sure the CO2 valve discharge lever (fig. 4-1) is in
operating position.  Install an empty CO2 cylinder in the inflator to
prevent leakage.
b. Inflate the cells, through the mouth inflation valve, with oil and
moisture-free regulated low pressure air to a pressure of 2 psi, and let
stand for a minimum of 15 minutes.  After this 15-minute period
readjust the pressure to 2 psi if necessary. When the flotation cells are
inflated, apply pressure to each side of the cell so as to place the
rubber under a slight strain. Inspect the cell to make sure the rubber is
firmly molded and has not begun to split or separate. Condemn cells
showing signs of splitting or separating.
4-2






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