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                           PART 1-DESCRIPTIVE

         are on the wall of the front cockpit.  The sets may be
         any of the following:-
                               TR 1934/35
                               TR 1934/36
                               Two TR 1936
                               TR 1985/86
                               TR 1988/87

    (b)  Intercomm is through the amplification stage of the
         V.H.F.

    (c)  There is a mic/tel socket (81)(118) on the starboard wall
         of each cockpit.  Quick-release sockets may be fitted to the
         sides of the seats.  There is a press-to-transmit switch (48)
         on the top of each control column, with a spring-loaded
         mute switch beside it; these may be moved to the inboard
         throttle lever in the front cockpit.  Post-Mod. 812, the
         MUTE-NORMAL switch (119) in the rear cockpit is on
         the starboard wall and is not spring-loaded.  On Naval
         aircraft the V.H.F. cannot be used until the oxygen is on.
         A switch marked MIC, by the oxygen regulator, must be
         put ion after turning on the oxygen.

    (d)  The I.F.F. controller (72) is on the starboard wall of the
         front cockpit, together with the F (70) and D (69) switches.
         G-MANUAL G-AUTO, and G-D switches (9) are on the
         port wall of the front cockpit.
    
    37   Gyro gunsight
         
         An electrically-operated gyro gunsight Mk. 4B may be
         above the instrument panel in the front cockpit.  The gun-
         sight selector-dimmer control (68) is on the starboard side
         of the cockpit.  The master circuit breaker (41) is to the
         right of the gunsight and the ranging control is incor-
         porated in the port engine throttle lever.  Spare filaments
         (37) are stowed to the left of the sight.  The retraction con-
         trol switch (38) is to the left of the gunsight and, in the
         event of electrical failure, it is possible to lower the gun-
         sight by pushing in a manual control (40) below the sight.
         This control should be used only in an emergency, since
         servicing will be necessary before the sight can be used
         again.  The sight is automatically lowered when the hood
         is jettisoned.

27

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