PART 1-DESCRIPTIVE
Page 17            compass to function.   The magnetic indicator remains white
Para. 17            Post F.T.C. Mod. 101 the indicator changes to black during start
(b) (iii)              up.   Pre F.T.C. Mod. 101, after start up, when engine r.p.m.
A.L.1               are above generator cut-in speed, automatic change-over to No. 1
                      inverter occurs and the indicator changes to black.

                 (iv) During taxying, if engine r.p.m. are reduced below generator
 	       cut-out speed the inverters will auto-change to No. 2 and the
 	       indicator will show white.   If this occurs engine r.p.m. should
 	       be increased and if necessary the reset pushbutton pressed to re-
 	       engage the No. 1 inverter.   With F.T.C. Mod. 101 fitted auto-
 	       change should not occur until well below engine idling r.p.m.
 	       In this case if the indicator reverts to white No. 1 inverter
 	       is unserviceable.
------------------------------------------------------------------------
         WARNING.-The reset pushbutton must not be
 	          used during flight when auto-change-
 	          over has occurred or incorrect opera-
                  tion of the magnetic indicator may
 	          result.
 	       
      (v) After take-off, operation of the port undercarriage
 	  door lock micro-switch completes a circuit  to a hold-in
 	  relay which ensures continuity of the inverters circuit
 	  should the FLIGHT INST switch subsequently be
          set inadvertently to OFF.   This hold-in relay operates
 	  despite any subsequent undercarriage lowering.
 	  After flight either inverter may only be switched off
 	  by setting the Ground/Flight switch to the Ground
 	  position.

  18.  Oxygen system

  (a)  The oxygen supply is contained in four interconnected
       cylinders.   The regulator (12) at the port side of the
       instrument panel controls the flow to the port economiser
       and to the starboard regulator (44).   The economisers are
A.L.1    fitted behind the starboard port seat.   Adjacent to the bottles
       is fitted a charging valve, access to which is gained
       through the fuselage nose panel.

  (b)  Mod. 3432 introduces an automatic line valve, incor-
       porating an ON/OFF lever (2), between the supply
       cylinders and the regulator, the on/off cock of which is
       locked fully on.   Below 8,000 feet the line valve lever may
       be used as a master control and oxygen is only supplied
       with the lever ON.   At 8,000 feet the lever, if OFF
       moves automatically to ON and cannot be turned OFF
       again until height is reduced below 8,000 feet.

17