PART I-DESCRIPTIVE
A.L.4 (c) The ejection gun is fired by pulling the handle above the headrest.
Para. 38 When Martin Baker Mod. 309 is embodied a secondary firing handle
(contd.) is fitted to the forward edge of the seat pan and is intended for use
Page 39 when ejecting in positive G conditions. When either firing handle is
pulled the ejection gun is fired and ejection follows.
(d) All leads incorporate quick releases which are automatically broken
on ejection.
(e) After ejection, at heights of l0,000 ft. and below, a barostat causes
an automatic cycle to commence. After 3 seconds the safety harness
is released as are the face screen, firing handle and headrest pad. An
apron attached to the seat drogue then pitches the pilot head first
out of the seat, at the same time opening his parachute.
(f) A manual override D-ring is fitted over the ripcord D-ring and should
be operated to isolate the automatic device if the system has failed.
(g) Leg restraining cords
(i) When Martin Baker Mod. 308 is embodied, leg restraining
cords are fitted in lieu of footrests. The thigh guards are
retained.
(ii) The leg restraining cords ensure that the occupant's legs are
drawn back automatically and restrained close to the seat pan
during ejection, thus providing leg clearance and preventing the
legs being blown apart after ejection. The restraining cords pass
through snubbing units at the front of the scat pan. These units
allow the cords to pass freely down through the unit, but pre-
vent them passing upwards. A release button is provided under
each snubbing unit to allow the occupant to adjust the cords to
give comfortable leg movement in the aircraft.
(h) Single lever ejection (Mod. 347)
With Mod. 347 embodied, when either firing handle is pulled the
hood is jettisoned immediately by gas pressure from a hood jettison
cartridge; at the same time a delay unit at the back of the headrest
is started. This unit withdraws the sear from the seat one second after
the handle is pulled. Ejection then follows.
NOTE.-Either handle must be pulled firmly to its fullest extent to
ensure correct operation.
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39. Oxygen system
(a) Oxygen is carried in a Mk. 5D cylinder in the starboard
wing (Mod. 682 introduces a second cylinder.) A Mk.
17 or 17B demand regulator controls the supply to the
pilot.
(b) A contents gauge (67) is aft of the regulator (66) on the
forward end of the starboard shelf. The regulator con-
sists of an ON/OFF valve which controls the flow of 39 |