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PART I-DESCRIPTIVE


     (c)  Hydraulic power reserve

          Two accumulators are fitted in the power controls circuits
          to provide a reserve of power if the main supply fails.
          This reserve may be sufficient for several cycles of aileron
          and elevator movement before the controls revert auto-
          matically to Manual.  Even if no control movement is
          made, accumulator pressure will not be maintained for
          a long period due to seepage through the hydraulic
          components.  Certain hydraulic pipe failures can cause
          immediate reversion to Manual.


     19.  Controls and indicators

     (a)  Ailerons

          Hydraulic pressure to the aileron hydroboosters is
          selected by pushing in the AILeron POWER on/off
          selector (34) below the port side of the instrument panel.
          It is pulled out to select Power off.
         
     (b)  Elevator
     
          A similar control (64) ELevator POWER on/off is fitted
          below the starboard side of the instrument panel for
          hydraulic selection to the elevator hydrobooster.
          
     (c)  Power controls engagement warning
     
           (i)  Two green lights (35) and (62) on the instrument
                panel near their respective selectors come on when
                their associated boosters are correctly engaged in
                Power.
                
          (ii)  A red warning light (52) in the centre of the instru-
                ment panel flashes if any one of the boosters is not
                correctly engaged in Power, once power has been
                selected.
                
     (d)  Hydraulic failure warning
     
          An audio warning over the pilot's headset, providing the
          R/T is on, provides indication that the hydraulic system
          is losing pressure.  It sounds when pump delivery has
          fallen to below 2,150 lb./sq. in.
          
     20.  Engaging power controls
     
     (a)  When Power is initially engaged on the ground it is
          possible that the locking pawls will not be opposite their

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