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movement.
CITATION MUSTANG OPERATING MANUAL
DRAFT
15-10 510OM-00
CITATION MUSTANG OPERATING MANUAL
FLAP CONTROL
SWITCHES
FLAP MONITOR
SWITCHES
FLAP
DRIVE SHAFT
FLAP
ACTUATOR
(MECHANICAL)
MECHANICAL
INTERCONNECT
CABLE
FLAP POWER
DRIVE UNIT
(PDU)
FLAP
ACTUATOR
(MECHANICAL)
Figure 15-9. Flap System Schematic
LEGEND
ELECTRICAL
CONTROL
Figure 15-8. Flaps—LAND Position
510OM-00 15-11
CITATION MUSTANG OPERATING MANUAL
When the pilot moves the flap handle from one
position to another, the flap controller senses
the disagreement between the flap handle position
and the flap panel position, and energizes
the PDU to move the flap panels until the signals
are brought back into agreement. If the
flap controller detects a fault, it immediately
stops the PDU and goes into idle mode and the
amber FLAPS FAIL message appears.
Flap panel position is monitored by a flap
monitor circuit and is graphically depicted in
the cockpit on the EICAS display, usually on
the multifunction display (MFD) (Figure 15-
10). To generate the analog flap position indication,
the flap monitor evaluates:
• Command signals from the flap handle
• Position signals from the right interconnect
pulley
• A monopole signal from the PDU
If the flap monitor loses all flap-position inputs
(i.e., TO/APR and LAND positions), it replaces
the EICAS flap position display with
a red “X.”
In reversionary mode, only text appears on
the EICAS to indicate flap position (Figure 15-
11). Three positions are identified:
• UP (fully retracted)
• TO/APR (takeoff/approach)
• LAND (landing)
In emergency power mode, flap information
is not shown on the EICAS, because the flap
monitor circuit is not powered.
The flap system is DC-powered three ways:
• The flap drive motor is powered from the
left feed bus No. 2, through a current limiter
in the aft J-box, to the flap system
printed circuit board (PCB).
• The flap control is powered from the left
feed bus No. 2, through the FLAP CONTROL
circuit breaker in the aft J-box.
• 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.
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