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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