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                      PART IV - EMERGENCY HANDLING

             either of the undercarriage selector buttons are in,
             all hydraulic fluid will be jettisoned, resulting in
             Manual reversion.  The rate of jettisoning is greater
             if the UP button is in.  Therefore depending on
             prevailing weather conditions, the following should
             be borne in mind.

        (iii)If conditions are favourable, i.e., good visibility,
             and a steady wind down the runway, Manual should
             be selected before operating the emergency control
             and the landing made in Manual.
             
        (iv) If conditions are not favourable, i.e., a strong cross
             wind or if the wind is gusting, the loss of hydraulic
             fluid may be prevented if both undercarriage selector
             buttons are set to the out position.  To achieve this
             carry out the following procedure:-

             1.  Select up normally to ensure that the 'DOWN'
                 selector button is out.
                 
             2.  Pull out the 'UP' button, which requires little
                    effort, and ensure that it remains out.
                    
             3.  Operate the emergency air selector by holding
                 the knob in and then pulling the handle.
           WARNING.-It is essential that the UP button remains
                    out.  There is a tendency for it to return to
                    the in position.  If this occurs Manual
                    reversion will follow, in which case the
                    power control switches must be set to OFF.
             
        (v)  With both selector buttons out, both solenoids in
             the selector valve are de-energized enabling the slide
             valve to adopt a neutral position.  The undercarriage
             hydraulic lines are thus isolated from the remainder
             of the hydraulic system and only the fluid in the
             lower end of the jacks will be jettisoned.  The flying
             controls will remain in Power and the flaps may be
             operated normally.  When the undercarriage up
             selector button is out the airbrake is isolated.
             
        (vi) If complete electrical failure has occurred, both
             solenoids in the selector valve will automatically be
             de-energized and the slide valve will be in the
             neutral position.  When the emergency lowering
             system is used only the fluid in the lower end of
             the jacks is jettisoned.

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