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FGC pitch guidance will not generate commands to exceed Vmo or Mmo. When a potential
overspeed condition exists, FLC will command a pitch maneuver to maintain a speed reference
3 knots less than Vmo or Mmo.
AUTOMATIC FLIGHT CONTROL SYSTEM
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
04−10−25
VERTICAL NAVIGATION (VNAV) MODE
VNAV mode contains 4 vertical submodes
that can be flown using speed and altitude targets, that
are programmed in the active flight plan of the FMS. A double Cchord
(aural) is activated for VNAV
vertical track alerts. However, if the FD/AP active vertical mode is not a VNAV submode, the aural
vertical track alert is inhibited. Double C − chord
VNAV mode is activated by selecting VNAV on guidance panel. The vertical mode active at the time
shall remain engaged.
FMS submode
selections when in VNAV mode are as follows:
· VFLC − Operates identical to FLC mode, except that the target altitude from the FMS is used
for climb or descent. The speed command is from the active displayed speed target (MAN or
FMS) on the PFDs. VFLC will also engage if VALT is engaged and FMS initiates a climb or
descent. Also if VALT or VPTH is engaged and FLC is selected on guidance
· VPTH − Used to fly a fixed flight path angle to a vertical waypoint during descent. VPTH will
engage whenever FMS initiates a path descent which may occur while in VFLC or VALT
modes. VPTH
LNAV AP1 VFLC LNAV AP1 VPTH
A VNAV target altitude bug will appear on the altitude tape of selected PFD.
GF0410_084
104 00
9500
10500
9500
100 00
VNAV TARGET
ALTITUDE
SELECTED
ALTITUDE BUG
ALTITUDE
TREND VECTOR
VNAV TARGET
ALTITUDE BUG
VERTICAL SPEED
TARGET READOUT
· VASEL− Operates identical to ASEL mode. VASEL submode
will arm as soon as VFLC or
VPTH is engaged. VASEL
LNAV AP1 VFLC LNAV AP1 VASEL LNAV AP1 VASEL
VALT
VASEL mode is cancelled whenever VALT mode engages.
· VALT − Operates identical to ALT mode. VALT submode
will engage automatically when
VASEL has captured the target altitude. VNAV
VALT will also engage whenever VNAV is activated VNAV on guidance panel and airplane is
within 250 feet of VNAV target altitude.
100 00
10500
GF0410_088
LNAV AP1 VALT
100 00
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
04−10−26
MULTI-AXIS MODES
The following are multiaxis
modes of operation:
Approach (LOC/GS, VAPP) Modes
The approach mode provides for automatic intercept, capture and tracking of the front course
localizer and glideslope signals which enables the pilot to fly a fully coupled ILS approach. APR
modes are based on vertical path deviation and valid glideslope on the selected PFD.
When APR mode is armed APR , HDG is automatically active
HDG AP1 ALT
LOC .
ILS
ILS lateral/vertical capture and tracking is established, based on data from selected PFD.
The lateral beam must be captured before the vertical beam in order to prevent inadvertent
descent.
Distance and beam width estimates for the vertical axis are :
· The vertical distance is based on radio altitude information. If radio altitude information is not
available, the distance estimate is based on vertical speed, middle marker beacon and an
assumed initial altitude of 1500 feet. The beam width is based on the estimated distance,
glideslope deviation, airspeed and an assumed glideslope angle of 3°. The beam width is
fixed at ±1°.
Tracking performance for glideslope mode is within ±1 dot from 700 to 100 feet (radio altimeter).
ASEL is inhibited during glideslope capture.
During a CAT 2 approach, EFIS will monitor for excessive deviation from the beam and will
provide appropriate annunciation. The outputs provided by AFCS (used by EFIS) in the
determination of CAT 2 status are glideslope arm or capture and dual couple status. A valid CAT 2
status is indicated on the PFD. A CAT 2 window also appears to display deviation from the beam.
CAT 2
Window
GF0410_091
20 20
20 20
CAT 2
10 10
10 10
LOC AP1 GS
VOR Approach (VAPP) Mode
VOR approach mode is identical to VOR mode except that, with flaps other than zero, the FGC
sets bank limits and rate limits to ensure proper gain control and performance from VOR capture
through the approach profile, to landing. FD roll commands are ±30° during VOR approach
capture and roll rate commands 7°/sec. When track phase is active, FD commands are ±14° and
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