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                           PART 1-DESCRIPTIVE

    (b)  Removable picketing rings, stowed on the decking be-
         tween the two cockpits, screw into holes in the underside
         of the mainplanes and the emergency skid; the holes are
         normally plugged with screws.


    19.  Trimming controls
    
         The elevator trimming tabs are controlled by handwheels,
         (25) (97), on the port side of both cockpits.  The rudder
         trimming tab is controlled by similar handwheels, (28)
         (100), aft and to the left of each elevator trimming tab
         handwheel.  Both elevator and rudder trimming tab con-
         trols work in the natural sense and each has an adjacent
         indicator (26), (27), (98) and (99).


    19.  Undercarriage controls
    
    (a)  Normal operation
         
         The hydraulically-operated undercarriage is selected by
         the levers (31) (102), one in each cockpit.  The levers have
         two positions, UP and DOWN.
         
    (b)  Ground lock
         
         When the weight of the aircraft is on the wheels or when the
         port oleo is compressed, the selector lever is locked down
         and it is not possible to select UP.   Mod. 1335 introduces
         an override lever (15) (91) on the port wall of each cock-
         pit.  The lever is marked EMERGENCY ONLY, U/C
         GRD. LOCK OVERRIDE, PULL UP.  It remains up
         until returned manually to the down position.

    (c)  Post-Mod. 1344, a window is fitted in the port side of the
         fuselage, just below the rear end of the hood, enabling the
         pilot to check (on the ground) that the groundlock hook is
         engaged with a pin, thus locking the selector lever.
         
         NOTE:-It is possible for the undercarriage to be locked
               down but the groundlock not engaged, if the
               selector lever is not fully down on the stop.
         
    (d)  Emergency operation
         
         If hydraulic pressure fails, the undercarriage may be raised
         or lowered by operating the handpump after making the
         normal selection.

19

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