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|  MIL-S-18471G(AS)
b. Preclude interference with or obstruction of the safe
functioning of the escape system in the event an ejectee
should release the face curtain following its actuation
and prior to the separation of the aircrewmember and the
ejection seat.
c. Withstand an actuation force of 600 pounds limit load
800 pounds ultimate load.
d. Preclude snagging by either the aircrewmember or main-
tenance personnel working in the cockpit or on the
ejection seat.
Incorporate face curtain redundancy in the form of
metallic cable connections between the upper firing
control handle and the redundant upper firing control
linkages.
Use of an upper firing control assembly which is not of the face curtain type
shall require the prior written approval of the procuring activity.
Upper firinq control handle. The upper firing control handle
3.2.2.10.2.1
shall:
Be located and centered above the aircrewmember's
a.
helmet and attached to the face curtain.
Be capable of being reached and moved to full extension
b.
by an aircrewmember having minimum specified population
sitting height and functional reach while fully restrained
with the ejection seat adjusted to a full-don position.
Be oriented and configured So as to be capable of being
c.
readily grasped by the maximum specified population
gloved hand(s) with palm(s) facing down.
Clear the aircraft canopy or radiation shields sufficiently
d.
to allow grasping by a maximum specified population
aircrewmember wearing all applicable flight equipment
with the ejection seat in its highest position.
Actuate the initiation subsystem when moved, once by the
e.
.
aircrewmember from the normal, dormant position and
achieving the fully extended (actuation) position.
Reach below the aircrewmember's oxygen mask at full
f.
extension
Achieve its travel from the normal position to the
g.
actuated position in response to forces applied by
the aircrewmember: 20 to 40 pounds for extraction
from its housing and 30 to 40 pounds to full extension.
The design shall ensure that, when fully extended,
the aircrewmember's arms from the shoulders to the
elbows are pressed tightly against the sides of the
chest with the forearms pointing upward.
h.
Remain clear of the aircrewmember's oxygen mask, protective
helmet and visor while on the ground, airborne and
throughout its full travel at any selected ejection seat
height.
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