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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

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