MIL-DTL-9479E (USAF)
3.2.11.4 Automatic restraint subsystem release. Provisions shall be incorporated to automatically
release the crew member from the seat system after ejection. Sequencing of the automatic release
shall be compatible with the recovery parachute operation (see 4.5.1, 4.5.6.11).
3.2.11.5 Manual restraint subsystem release. Manual restraint subsystem releases shall be
provided which incorporate the following features (see 4.5.1):
a. Ability to release the crew member from the seat system (including parachute and survival
equipment) when the seat system is in the aircraft cockpit.
b. Ability to release the crew member, and deploy the recovery parachute and survival
equipment from the seat assembly after ejection from the aircraft.
c. Actuation of the control with a squeeze to release the safety latch and a single motion to
initiate the subsystem.
d. Release control designed and located so that it can be easily reached and actuated by a
crew member with the control in the fully retracted position, including actuation by a
pressurized pressure suit gloved hand, if applicable.
e. The release control shall include a lock mechanism which requires a separate reset
function after the control has been actuated. The reset function shall not require the use of
tools.
3.2.12 Ingress and egress devices. Any fastening devices provided on the restraint subsystem for
normal ingress to, or egress from the seat system, shall be easy to operate, for example, single
movement, single handled, or without requiring multiple actions. The number of such devices
shall be kept to a minimum and shall be designed so that they can be attached and detached by the
crew member without assistance (see 4.5.1, 4.5.6.11).
3.2.13 Initiation subsystem. All pre-ejection functions and firing of the seat system rocket
catapult shall be accomplished by one complete extension of the ejection controls. Unless
otherwise specified, controls shall be integrated into loop-type hand grips on the forward portions
of both sides of the seat bucket. The complete ejection sequence shall be initiated by a single,
upward-and-aft movement of either hand grip. The motion of the ejection controls shall be
irreversible, and the controls shall be interconnected to provide initiation of ejection when either
or both of the controls are actuated. This subsystem shall be equipped with a safety lock
integrated into the controls, which must be released before actuation can be accomplished. The
safety lock shall be designed to permit arming and safetying the ejection control by a seated crew
member (see 4.5.1, 4.5.8).
3.2.13.1 Pre-ejection functions. The following are required pre-ejection functions that will occur
after activation of an ejection control (see 4.5.1, 4.5.8):
a. Initiation of crew member positioning and restraint.
b. Initiation of canopy and hatch removal.
c. Initiation of ejection sequencing subsystem where applicable (see 3.2.13.6).
3.2.13.2 Control forces. The force required to actuate each ejection control hand grip shall be 20
± 3 pounds, unless otherwise specified (see 4.5.1).
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