15-15
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
SECONDARY CONTROLS
FLAP SYSTEM
General
Interconnected slotted flaps are hydraulically
powered from a single flap control unit and
transmission shafting (Figure 15-13).The flap
control unit is normally supplied from the main
hydraulic system, but an independent fluid sup-
ply from the auxiliary hydraulic system is avail-
able in the event of a main system failure.
The flaps are controlled by a selector lever lo-
cated on the right side of the central control
pedestal (Figure 15-14). The lever moves in a
gated slot which corresponds with the follow-
ing flap positions:
• 0° (up or takeoff)
• 15° (takeoff)
• 25° (approach)
• 45° (landing)
A baulk, operative at the 15° slot, prevents in-
advertent selection of the up, approach or land-
ing positions. The baulk is released by pushing
the selector lever into the 15° slot in the gate.
Additional movement of the flaps downwards,
from the landing position to a lift-dump posi-
tion, is controlled by the airbrake selector lever.
Indications and Warnings
Flap position is indicated on an electrical in-
dicator located on the right side of the center
instrument panel (Figure 15-14). This indicator
also shows the lift-dump position.
A mechanical indicator located adjacent to
the thrust levers shows the position of the flap
selector lever. Additionally, the flap positions
are marked against the corresponding gates of
the slot in which the lever moves.
A warning horn sounds if the flaps are se-
lected to the 25 or 45° positions when the
landing gear is not locked down.
DUMP
25
15
45
FLAP
FLAPS
FLAP SELECTOR LEVER
45
°
25
°
15
°
0
°
FLAP POSITION INDICATOR
Figure 15-14. Flap Selector Lever
Position Indication
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