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Aircraft emergency IFF actuation |
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|  MIL-S-18471G(AS)
3.2.2.14.2 Aircraft emergency IFF actuation. The escape system shall
provide for automatic actuation of the emergency IFF system upon ejection.
The IFF actuation system design shall preclude inadvertent actuation caused
by ejection seat assembly or aircraft maintenance actions such as movement,
removal, or installation of ejection seat assemblies or equipment regardless
of whether or not the aircraft electrical system is energized.
3.2.2.15 Classified equipment destruct system initiator. If a classified
equipment destruct system is initiated by the escape system, the actuation
system shall be designed to prevent inadvertent activation caused by ejection
seat assembly or aircraft maintenance actions (such as movement, removal, or
installation of ejection seat assemblies or equipment), regardless of whether
or not the aircraft electrical system is energized.
3.2.2.16 Ground safety subsystem. An escape system deactiviating device
shall be provided which, when operated, shall:
a. Safety the ejection seat propulsion unit arid any pre-
election functions which could injure maintenance personnel
working in the cockpit or an aircrewmember in the process
of ingressing or egressing the ejection seat.
b. Readily indicate by visual means that the ejection seat is
safetied and is not ready for flight.
c. Preclude the aircrewmember from flying in the aircraft
without being aware that the ejection seat is safetied.
The safety device shall be designed so that it will remain in either the
safety-on or safety-off position. When in the safety-off position, the device
shall not interfere with a seated aircrewmember's comfort. The safety device
shall perform as required throughout an installed cycle life predicated upon
five cycles per flight and calculated in accordance with 3.4.2.1. In multi-
place aircraft, any vacant seat bypass control may utilize this device to
perform the dual functions of providing ground safety and vacant seat bypass.
3.2.2.16.1 Removable ground safety pins. Removable ground safety pins
shall be a single-acting, quick-release type pin designed in accordance with
MIL-P-23460. Safety pins, when installed, shall be highly visible and readily
accessible. Safety pins shall be securely fastened to a red fabric streamer
designed in accordance with NAS 1091. The streamer shall be marked in large
white letters: "REMOVE BEFORE FLIGHT". Safety pins shall not lock in place
unless the devices in which the pins are inserted are safetied.
3.2.2.16.1.1 Safety pin and streamer flight stowage. Provisions shall be
made for the stowage of escape system safety pins and streamers to prevent
their loss or interference with aircraft controls and to ensure their availability
to ground crews. Stowage positions shall be located in a position accessible
to a seated aircrewmember and shall permit stowage of safety pins and streamers
and the securing of the stowage device with one hand. The stowage provisions
shall be accessible to maintenance personnel or rescue personnel reaching into
the cockpit.
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