MIL-PRF-81542C
3.20 Function/operation. The life raft shall inflate at the required pull force to its design
shape in not more than 60 seconds when tested as specified in 4.12. During the inflation, the life
raft shall be observed for impediment or blockage of the flow of gas, loss of gas to the ambient
air, or restriction by any component or accessory. There shall be no evidence of structural or
material failure in any respect. All the sealed areas, seams, seam tapes, and attachments shall
remain intact and shall show no indication of separation. The floor shall not be distorted and
there shall be no difference in the rise between the sides of the raft. The erected canopy shall
withstand 35-knot winds and 52-knot gusts in open water. The life raft shall demonstrate
seaworthiness and stability in an open sea condition of 17 to 27 knot winds and waves of 6 to 10
feet. The raft shall be easily boarded by a subject wearing standard aviation life support
equipment including a flight suit, survival vest, inflated life preserver, and flight boots. See
Table I for anthropometric data.
3.21 Environmental.
3.21.1 Temperature extremes.
3.21.1.1 Low temperature. The life raft shall inflate into a boardable shape within 5
minutes at 0 F (-18 C) when tested as specified in 4.13.1.1. There shall be no hindrance to the
flow of gas or restriction by any component or accessory during inflation. All the seams, seam
tapes, sealed areas and attachments shall remain perfectly intact and shall show no evidence of
separation. There shall be no evidence of construction or material failure in any respect.
3.21.1.2 High temperature. The life raft shall inflate to design shape within 60 seconds at
160 F (71 C) when tested as specified in 4.13.1.2. Inflation shall be without any hindrance to
the flow of gas or restriction by any component or accessory. All the seams, seam tapes, sealed
areas and attachments shall remain perfectly intact and shall show no evidence of separation.
There shall be no evidence of construction or material failure in any respect.
3.21.2 Low pressure (altitude). The packed life raft shall withstand a low pressure
environment and rapid pressure changes when tested as specified in 4.13.2. The life raft shall
show no leakage of gases and no rupture or failure of sealed packaging.
3.21.3 Vibration. The packed life raft shall resist the effects of aircraft vibration when
tested as specified in 4.13.3. The life raft shall show no leakage of gases and no rupture or
failure of sealed packaging.
3.21.4 Accelerated aging/life cycling. The packed life raft shall withstand the effects of
accelerated aging/life cycling when tested as specified in 4.13.4. The life raft shall inflate to
design shape within 60 seconds when actuated as specified in 4.13.4. Inflation shall be without
any hindrance to the flow of gas or restriction by any component or accessory. All the seams,
seam tapes, sealed areas and attachments shall remain perfectly intact and shall show no
evidence of separation. There shall be no evidence of construction or material failure in any
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