PART I-DESCRIPTIVE

           (ii)  landing and taxy lamps
                 The retractable landing and taxy lamps in the fuselage
                 nose are controlled by a two-position switch (56) on the
                 left-forward console.  When the switch is set to
                 EXTEND & ON both lights come on and extend to the
                 landing position.  Upon touchdown when the weight of
                 the aircraft compresses the starboard oleo, the landing
                 lamp is automatically extinguished and the taxy lamp
                 extends further to the taxying position and remains on.
                 If a "roller" landing is made with the switch in the
                 EXTEND & ON position, the landing lamp relights and
                 the taxy lamp returns to the landing position when the
                 aircraft "unsticks".
                 
          36.    Oxygen system

                 NOTE.- A pressure demand mask Type A13A must be
                        worn.
                 Early aircraft up to serial No. XB. 593
           (i)   A type A14 pressure demand regulator is fitted and is
                 supplied from four Type D2 cylinders installed in the
                 nose.  A blinker-type flow indicator and an oxygen
                 system pressure gauge (51) are located on the left forward
                 console., and the regulator on the inboard face of the
                 console has two controls, the pressure breathing knob
                 (59) and the diluter control handle (60).
           (ii)  The diluter control handle has two positions NORMAL
                 (back) and 100% OXYGEN and should be kept in the
                 NORMAL position except in emergency.  The pressure
                 breathing knob should be set at NORMAL for cockpit
                 altitudes below 30,000 ft. (If the cockpit pressure system
                 is working correctly the cockpit altitude should not
                 exceed this height.)  For cockpit altitudes between
                 30,000 and 40,000 ft. the knob should be turned clock-
                 wise to SAFETY and for cockpit altitudes above
                 40,000 ft. the knob should be further turned to the cock-
                 pit altitude.
                 Later aircraft from serial No. XB. 594
           (iii) A type D1 pressure demand regulator is fitted.  The
                 controls are mounted on the inboard face of the left
                 forward console and consist of a combined regulator
                 pressure gauge and visual blinker indicator (110), an
                 ON-OFF valve (106) below the gauge, an air inlet switch
                 (109) with two positions NORMAL and 100%
                 OXYGEN above the gauge, and an emergency switch
                 (107) which has three maintained positions including the

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