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|  MIL-S-18471G(AS)
Be automatically released from the ejection seat during
i.
the aircrewmember and ejection seat separation phase.
The face curtain shall be:
Face curtain.
3.2.2.10.2.2
Sufficiently flexible, shaped (full) in center, long
a.
and wide to extend over the aircrewmember's helmet
and fully cover the entire open face area of the
helmet, oxygen mask and helmet visor.
b. Secured to and move with the upper firing control handle.
c. Strong enough to withstand the windblast loads specified
in 3.3.2.
d. Adequately protected from, if not impervious to, the
environmental conditions of 3.1.9.
e. Extended, during actuation of the upper firing control
handle, in a manner which causes the aircrewmember's
head to be positioned on and supported by the headrest.
f. Secured to the redundant upper firing control linkages
without reliance upon the helmet surface as a bearing
point for any part of the linkages.
3.2.2.10.3 Firing control mechanism protections. The firing control
mechanisms shall be designed, located, and protected to preclude inadvertent
escape system actuation resultinq from foreign object interference or damage
from inadvertent or improper operation or maintenance of aircraft systems and
equipment.
3.2.2.10.4 Firing control linkages. Design of the lower and upper firing
control linkages shall be independent to ensure the jammed or disconnected
condition of one does not prevent operation of the other. In addition,
redundancy shall be incorporated into all firing control linkages.
3.2.2.11 Interseat sequencing/spatial separation subsystem. Each escape
system containing two or more ejection seat assemblies shall be provided with
an interseat sequencing/spatial separation subsystem. The subsystem shall:
Upon command, automatically sequence individual ejection
a.
seats of the escape system in a manner which ensures that
ejection seat-aircrewmember combinations will not collide
with each other nor with jettisoned equipment, such as
aircraft canopies.
b. Protect aircrewmembers from heat and blast effects resulting
from the other ejection seats being ejected during escape
system operation.
c. Accomplish the spatial separation sequence in Minimal time.
d. Transmit all signals redundantly (i.e, via at least two
independent, functionally parallel, and physically separated
paths).
e. Not eliminate the ability of aircrewmembers to effect individual
escape prior to subsystem initiation and subsequent to any
subsystem failure.
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