static line

noun Military.
a line attached to a parachute pack and to a cable in an aircraft for the purpose of automatically opening the parachute after it is dropped.

Origin:
1925–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
static line
 
n
a line attaching the pack of a parachute to an aircraft, so that the parachute is opened when it has fallen clear of the aircraft

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The edge of the solar system is not some static line on a map.
The aircraft must be configured for static line operations.
Atmospheric vacuum breakers shall not be used under conditions of static line
  pressure.
It is also called a sensing line, impulse line, equalizing line or static line.
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