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|  MIL-S-18471G(AS)
measured from the catapult pressure baseline (see
6.4.6) as shown in figure 7. The catapult pressure
baseline shall be calculated in accordance with the
appendix.
Minimize spattering of expended explosive material on the
d.
aircrewmember.
3.2.2.12.2 Automatic backup mode. The escape path automatic backup
mode shall be capable of meeting the requirements listed below, in addition
to those listed in 3.2.2.12:
a.
In the event of partial or total failure of the redundant
primary mode, automatically clear the escape path of all
aircraft structure and equipment.
b. During the automatic backup mode, limit the catapult
pressure dynamic loading contribution imposed upon the
ejection seat by the canopy or other structure to a
retarding pulse of peak amplitude not greater than 8.0g's
and base duration not greater than 20 milliseconds, as
measured from the catapult pressure baseline (see
6.4.6) and as shown in figure 7.
3.2.2.12.3 Escape path obstructions.
3.2.2.12.3.1 Aircraft canopy. The aircraft canopy shall be cleared by
jettisoning ballistic fracturing, mechanical penetration, or other means.
3.2.2.12.3.2 Consoles, controls, and other obstructions. Any consoles,
controls, structures and other obstructions protruding into the escape path
shall be cleared from the escape path in accordance with the requirements of
3.2.2.12.6.
3.2.2.12.4 Escape path controls.
3.2.2.12.4.1 Automatic control. The automatic control shall insure that
initiation of the escape sequence shall cause both the redundant primary
mode and the automatic backup mode to automatically perform in a programmed
sequence which will clear the escape path. Any combination of partial failures
or total failure of the redundant primary mode shall not adversely affect the
operation of the automatic backup mode. In addition, the automatic control
shall insure the shortest possible timing and shall at least equal the time
specified in 3.2.2.12.d between system initiation and ejection seat first
motion. For example, in a system utilizing aircraft canopy jettisoning as
a primary mode, the automatic control shall signal the ejection seat to
commence first motion at the preset time delay or upon clearance of the air-
craft canopy from the ejection path, whichever occurs first. Any combination
of failures of the devices utilized to signal the completion of pre-ejection
events shall not prevent catapult firing at the end of the preset time delay
limit. The preset time delay limit shall be not greater than 0.3 seconds.
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