The airbrakes are controlled by an AIRBRAKE
selector lever located on the center control
pedestal (Figure 15-16). The lever moves ina
slot having a scale marked with three positions:
SHUT, OPEN, and DUMP.
The normal (flight and ground) operating range
is from the SHUT and fully OPEN selections.
Intermediate positions are obtained by leav-
ing the selector lever at the required setting
within the range.
A system of cables run from AIRBRAKE se-
lector lever to a hydraulic selector valve
mounted on each airbrake actuator. Main hy-
draulic system pressure is used to operate the
airbrakes through a hydraulic actuator in each
wing. To cater for control system failure, the
selector valve is biased to the SHUT position.
There is no service available from the auxil-
iary hydraulic system for the airbrakes should
the main hydraulic system fail.
Lift Dump
The AIRBRAKE selector is interconnected with
the input lever to the flap control unit. Selection
of airbrake between the SHUT and OPEN po-
sitions does not affect the flap position.
During the landing run with the flaps selected
to the 45° (land) position, lifting the AIR-
BRAKE selector and then moving it rearwards
into the DUMP position automatically lowers
the flaps from the 45° setting to 75°. It also
opens the airbrakes further to provide maxi-
mum drag.
Annunciations and Warnings
The position of the airbrakes is shown by an
AIR BRAKES OPEN-SHUT magnetic indi-
cator. The indicator is connected to two mi-
c r o s w i t c h e s , o n e o n e a c h a i r b r a ke . Wi t h
electrical power off, cross-hatching is dis-
played. With power on, the indicator shows
OPEN when either airbrake is in any position
other than fully closed. With both airbrakes
closed, SHUT is displayed.
A white AIR BRAKES annunciator is illumi-
nated on the MWS when the airbrakes are ex-
tended from the SHUT position (Figure 15-16).
A warning horn sounds if all of the following
conditions occur:
• The landing gear is down.
• Both thrust levers are advanced to more
than 40–60% N
1
power.
• The airbrakes are extended from the
SHUT position.
Electrical Power Supplies
The AIR BRAKES annunciator is powered
from PS2(a) busbar via circuit breaker AIR-
BRAKE (L2) on panel DA-D.
Revision 1
15-18
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
OPEN/SHUT ANNUNCIATOR
AIR BRAKE SELECTOR LEVER
Figure 15-16. Airbrake System Control
and Indication
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