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• The flap monitoring system is powered
from the left feed bus No. 1, through
the FLAPS circuit breake r i n t h e
FLIGHT CONTROL section of the left
(pilot) CB panel.
Operation
Preflight
During preflight, visually check that the flap
position indication and the flap handle agree
on position.
Rotary Test
Select the FLAPS position with the rotary
TEST knob (Figure 15-12). The flap position
display on the MFD is replaced with a red X
and the amber STALL WARN FAIL and amber
FLAPS FAIL messages appear for 3 seconds,
then extinguish.
Normal Operation
To reposition the flaps, push in on the flap handle
and select the desired position. Allow the flap
panels to stabilize in the new position. Confirm
that flap indication and handle position agree
before selecting the next position. Takeoff/approach
flaps are limited to airspeed at or below
185 KIAS. Landing flaps are limited to airspeeds
at or below 150 KIAS.
FLAPS
UP
TO/APR
LAND
Figure 15-10. Flaps Position Display
FLAPS TO/APR
Figure 15-11. Flaps Position Display—
Reversionary Mode
SPEEDBRAKES
Speedbrakes on the wings provide control of
lift and drag. On the Citation Mustang, flaps
increase both lift and drag, while speedbrakes
increase drag and slightly reduce lift (acting
as wing lift spoilers).
Components
The speedbrakes are on the upper and lower
surface of the wing forward of the flaps, pivoting
on hinge lines at (and parallel to) the aft
spar (see Figure 15-1). The speedbrake system
consists of an upper panel and a lower panel
on each wing, driven by push rods connected
to an electromechanical actuator (one on each
wing) (Figure 15-13). The speedbrakes can
be set at two different positions: stowed and
extended. The panels are commanded to either
extend or retract; there are no intermediate
positions.
Controls and Indications
The speedbrakes are controlled by a three-position,
momentary thumb switch on the outboard
side of each throttle lever knob in the
cockpit (Figure 15-14). The pilot uses the
switch to select the desired speedbrake position
(RET or EXT).
Speedbrake position indication is provided by
the white SPD BRK EXTEND message when
the speedbrakes are not in the stowed position.
Operation
Move the momentary switch on the throttle
control lever knob aft to EXT (extend) and forward
to RET (retract). The speedbrakes extend
when the speedbrake switch is pushed to EXT
and the throttle levers are set for less than approximately
85% N2 engine power.
When a direction is commanded, the actuator
moves to that position and remains there until
commanded (extend or retract) to the opposite
direction. The pilot does not need to hold
the speedbrake switch forward or aft during
the entire cycle; only a momentary push or pull
is required to initiate a sequence.
NOTE
A commanded extension can immediately
be reversed by the pilot and
the speedbrakes will stow. However,
when a retraction is commanded, the
speedbrakes cannot be reversed
(opened) until fully stowed (closed).
15-12 510OM-00
CITATION MUSTANG OPERATING MANUAL
Figure 15-12. Rotary TEST Knob
Figure 15-13. Speedbrakes (Extended)
510OM-00 15-13
The speedbrakes control-and-monitoring circuit
monitors speedbrake positions and commands
retraction when either throttle is set for
greater than approximately 85% N2.
The speedbrake system is DC-powered three
ways:
• The left speedbrake actuator and the
speedbrakes control-and-monitoring circuit
are powered from the left electrical
bus No. 1, through the L SPEED BRAKE
circuit breaker in the FLIGHT CONTROL
section of the left (pilot) CB panel.
• The right speedbrake actuator is powered
from the right electrical bus No. 1,
through the R SPEED BRAKE circuit
breaker in the FLIGHT CONTROL section
of the left (pilot) CB panel.
• The speedbrake position sensors (proximity
switches) are powered from the left
feed bus No. 2, through the SPD BRK
SW circuit breaker in the aft J-box.
In the event of DC power failure, the speedbrakes
remain in their current position.
Emergency/Abnormal
For specific information on emergency/abnormal
procedures, refer to the appropriate
FAA-approved abbreviated checklists or the
Airplane Flight Manual (AFM).
CITATION MUSTANG OPERATING MANUAL
RETRACT
GA GA
RH THROTTLE KNOB
LH THROTTLE KNOB
SPEEDBRAKE
MOMENTARY SWITCH
　
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