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|  MIL-T-18404(NOrd)
3.1.4.3 Ready. - The condition of the torpedo when fully assembled with
the propulsion system non-operating and with some or all of the components in
operation as defined by the individual specification. This condition occurs
when the torpedo is installed on the launching vehicle and prior to firing.
3.1.4.4 Operating. -
The condition of the torpedo when running in the
water.
3.1.5 Vibration. - Vibration is a sinusoidal. motion defined by amplitude
and frequency. The amplitude may refer to displacement or acceleration. The
displacement is given in inches peak to peak or the corresponding maximum
acceleration in gravity units (g). The frequency is given in cycles per
second (cps).
3.1.6 Shock. - Shock is an abrupt change In the motion of a body re-
sulting from the sudden application of a large external force of short du-
ration. Shock, in general, can be described as a build-up of 90 percent of
peak force in less than 0.010 sec. Shock is described (a) as a pulse in
units of gravitational acceleration (g's), duration in milliseconds (ins) and
some description of the shock wave form, or (b) In terms of test conditions
outlined In MIL-S-901.
3.1.7 Acceleration (steady state). - Acceleration (study state) is the
time rate of change of velocity of a body resulting from the application of
a sustained external force with a uniform build-up to peak in more than
0.010 sec. Acceleration is given in gravitational units (g's).
3.1.8
rature. - The temperature of the environment to which the
torpedo is expressed in degrees Fahrenheit (F.).
3.1.9 Pressure. - The pressure of the environment to which the torpedo
is exposed is expressed in pounds per square inch absolute (psia).
3.1.10 Humidity, - Humidity is the relative humidity of the environment
to which the torpedo is exposed ex-pressed in percent (%).
3.1.11 Marine environment. - The marine environment to which the tor-
pedo is exposed is the salt-laden atmosphere of the sea and the sea itself.
3.1.12 Sand and dust. - Sand and dust is the environment of surface or
airborne particles of soil, sand, coral, ash or other similar natural or man-
made substances to which the torpedo is exposed.
3.1.13 Tropical environment. - Tropical environment is conditions of
high humidity, high temperature end spore exposure which present an oppor-
tunity for fungi growth.
3.1.14 To rpedo axes. - The axes of the torpedo are:
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