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Airspeed
Trend
Vector
Mach
Readout
0.88
220
200
190
180
170
160
150
0.856 M
185
6
4
Selected IAS
Readout
217
220
200
190
180
170
160
150
185
6
4
FMS SPD MAN
FLC
PUSH CHG
0.856 M
FMS SPD MAN
PUSH CHG
GX_02_031
200
Outer Knob
When rotated, enables
MAN mode or FMS mode
of airspeed reference.
Inner Knob
When rotated, sets
speed on airspeed
tape (MAN mode).
Manual Airspeed Bug
(Active)
FMS IAS or
MACH Speed Bug
(Standby)
GX_02_032
FMS IAS or
MACH Speed Bug
(active)
FMS SPD MAN
PUSH CHG
200
Manual Airspeed Bug
(standby)
P I LOT T R A I N I N G GU I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
2-32 For Training Purposes Only
Sept 04
Pitch Hold (PIT) Mode
PIT mode is automatically selected when no other vertical mode is active, and the
autopilot is engaged. Note that the lateral mode automatically engaged is the ROL
mode. If the pitch angle is greater than 20°, pitch hold mode will reduce the airplane
pitch angle to ± 20°. PIT reference is modifiable (within pitch limits), via pilot inputs
to the pitch thumb-wheel, or by TCS. The FGC will not prevent exceedances of VMO
or MMO in PIT mode.
PIT mode is annunciated in the vertical capture field on the PFD. Pitch mode is cleared
by selecting another vertical mode. PIT will flash for 5 seconds, when active.
The pitch hold mode holds a flight path angle rather than a fixed pitch angle. The
selected flight director pitch angle will change with altitude, configuration and/or
airspeed changes, while climbing, descending or in level flight.
Vertical Speed (VS) Select Mode
VS mode is used to maintain a pilot selected vertical speed reference. FGC will
generate pitch commands to align the airplane vertical rate displayed on the PFD. The
airplane vertical rate is adjustable via the pitch wheel. The pilot may select another
vertical speed reference without canceling VS mode by depressing the TCS button,
and maneuvering the airplane to another vertical speed.
FGC will not generate commands to exceed Vmo or Mmo when in VS mode. When a
potential overspeed condition is detected, VS flight director pitch commands will be
limited to 3 knots less than Vmo or Mmo and MAX SPD annunciation is displayed on
the PFD.
220
LIM ROL AP1 PIT
SPD VAPP VNAV
23500
ATT2
ADC1 0.88 30000
GX_02_033
AP
GX_02_034
NOSE
DN
NOSE UP
DISC
MASTER
TCS
Pitch Wheel
Touch Control
Steering DN
UP
P
I
T
C
H
VNAV
VS
IC
R/T
0.85
320
300
280
260
282
6
4
MAX
SPD
GX_02_035
2992 IN
VS 2500
9500
Vertical Speed
Target Readout
For Training Purposes Only
Sept 04
2-33
P I LOT T R A I N I N G GU I D E
AUTOMATIC FLIGHT CONTROL SYSTEM
When VS mode is active, the pitch angle is limited to ± 20°. The vertical speed
commands are from - 8000 feet/minute to + 6000 feet/minute.
VS mode is activated by selecting VS on guidance panel. VS mode is annunciated in
the vertical capture field on the PFD. VS mode is cleared by selecting another vertical
mode. VS will flash for 5 seconds, when active.
Altitude Select (ASEL) Mode
ASEL mode provides for automatic capture, flare and level off onto a preselected
altitude.
ASEL is armed automatically when the airplane is flying at a continuous vertical rate
of greater than 1 foot/second towards preselected altitude displayed on PFD for 1
second. The preselected altitude is adjusted via the altitude preselect knob on the
guidance panel.
ASEL will capture when ascending toward the preselect altitude and the preselected
altitude is within 2000 feet of current altitude and the altitude rate required to fly a
constant 0.05g capture curve is less than the current airplane inertial climb rate.
ASEL will capture when descending toward the preselect altitude and the preselected
altitude is within 10,000 feet of current altitude and the altitude rate required to fly a
constant 0.05g capture curve is less than the current airplane inertial descent rate.
FGC will generate pitch commands to capture the preselect altitude displayed on the
selected PFD. Pitch angle is limited to ± 20°. Once the reference altitude is reached,
the altitude hold mode is activated.
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航空翻译 www.aviation.cn
本文链接地址：
AUTOMATIC FLIGHT CONTROL SYSTEM(12)
