Issued with A.L.No.19/F                                          A.P.1565B, Vol.I Sect.I     

     

       (b)   The flow of liquid is governed by the needle valve, after
             turning ON the cock and pushing down the pump plunger to
             its full extent.  The plunger will return to the extended
             position on its own, and if required it can be pushed
             down again.  When deicing is no longer required the cock
             should be turned to the OFF [position.

     43.    Pressure head heater switch

            The heating element in the pressure head is controlled by
            a switch (4) below the trimming tab handwheels.  It should
            be switched off on landing in order to conserve the
            battery.
 
       
     F.S/7