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|  MIL-L-83491A(USAF)
Pressure. The completely deflated life raft shall be placed in a
4. 6.3
horizontal position. All the pressure readings shall be taken with the
life raft in this position. The primary buoyancy tube shall be inflated
with oil and water free air to a pressure of 5.0 psig. The air supply
shall be securely shut off; after minimum of 10 minutes, the pressure
in the primary buoyancy tube shall be checked and readjusted, if necessary,
to the original pressure of 5.0 psi. At the end of a minimum of 10 minutes
after the readjustment period, the pressure in the primary buoyancy tube
shall be not less than 4.75 psig. The primary buoyancy tube, while held
under pressure, shall be examined. There shall not be any evidence of
constructional or material failure in any respect. All of the seams, the
sealed areas, and the attachments shall remain perfectly intact and shall
not show any sign of separation. The life raft shall be deflated. The
life raft shall then be inflated to 5.0 psig and deflated four more times
for a total of five cycles each of inflation and deflation. During the
fifth inflation cycle, the primary buoyancy. tube shall still retain a pres-
sure of not less than 4.75 psig and shall show no evidence of constructional
or material failure.
Leakage. The completely deflated life raft shall be placed in a
4.6,4
horizontal position. All the temperature and pressure readings shall be
taken with the life raft in this position. The primary buoyancy tube
shall be inflated, with oil and water free air, to a pressure of 2.0 psig.
The air supply shall be securel shut off, After a minimum of 15 minutes,
the pressure in the primary buoyancy tube shall be checked and readjusted,
if necessary, to the original pressure of 2.0 psig. The temperature and the
barometric pressure shall be recorded at this time. At the end of a minimum
of 6 hours after the readjustment period, the pressure shall be measured and
corrected for any change in the temperature or the barometric pressure. The
corrected pressure in the primary buoyancy tube shall be not less than
1.5 psig. The life rafts may be stacked one upon another, during the in-
spection waiting period, providing the following conditions are met:
The temperature shall be recorded at a level comparable to the
(a)
height at which the life raft being inspected was stowed during the 6 hours
of the inspection waiting period.
At the end of a minimum of 6 hours from the readjustment periods,
(b)
the life raft to be checked for pressure shall be removed from the stacking
and placed in a horizontal position, The barometric pressure of the in-
spection area shall be recorded. The pressure in the life raft shall be
measured and corrected for any change in the temperature or the barometric
pressure. In any event, the pressure in a life raft shall not be determined
while another life raft is stacked upon it.
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