Page 14-4
Pilot’s Operating Manual
Original Issue: Feb, 2002
Sub-section 14
EQUIPMENT and FURNISHINGS
Hawker 800XP Pro Line 21
Section III - SYSTEMS DESCRIPTION
Armrests
When the control knob is turned, a screw adjuster increases or decreases the distance between the
armrest drive plate and the pivot block via a drive shaft, thereby raising or lowering the armrest. The
inboard armrest can be stowed by rotating the arm to the rear of the seat.
A slot in the barrel of the adjuster screw takes up any height adjustment and allows the armrest to align
parallel to the seat back. When fully folded, the armrest is pushed in towards the center of the seat,
reducing the seat width. The outboard armrest may be raised to an almost vertical position where it will
be held by a friction clutch until returned to the horizontal position by the occupant.
Back Cushion Lumbar Support
The seat back cushion is adjustable for up-down and in-out lumbar support. Lumbar in-out adjustment
is controlled by a handwheel on the right side of the seat. When the handwheel is rotated, the
movement is transmitted through worm and wheel gears to the cross shaft, to which two relay arms are
connected.
As the relay arms rotate, the lumbar cushion moves forward or backward in relation to the spine
structure. The up-down movement of the back cushion is controlled by a handwheel on the left side of
the seat. When rotated, the worm and wheel assembly causes rotation of a vertical shaft and a screw
at the top of this shaft causes the crossbar to be raised or lowered, moving the back cushion to the
desired position.
Figure 1
Crew Seat
