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· 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
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
04−10−27
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.
The fully coupled (dual arrow) ILS approach becomes active when the aircraft is below 1200 feet
AGL.
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
roll rate commands 4°/sec.
AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
04−10−28
MULTI-AXIS MODES (CONT'D)
Approach Mode
APPROACH MODE CAPTURE
HDG
045
090°
INBOUND
COURSE
LOCALIZER
TX
TYPICAL CAPTURE POINT
BETWEEN 1 AND 2 DOTS
APPROACH MODE INTERCEPT
HDG
045
HDG AP1 FLC
LOC
RUNWAY
SELECTED
HEADING
045°
LOC AP1 FLC
HDG
040
LOC AP1 GS
APPROACH MODE TRACK
RUNWAY
LOCALIZER
TX
MIDDLE
MARKER
3500 FEET
OUTER
MARKER
4.0−7.0 MILES
RADIO ALTITUDE
BETWEEN 1200
AND 1500 FEET
CRS
090
CRS
090
CRS
090
LOC1 12.0 NM
SRP
LOC1 9.0 NM
SRP
LOC1 4.0NM
SRP
GS
H
H
H
RUNWAY
GLIDESLOPE BEAM
TYPICAL CAPTURE POINT,
IS 1/3 DOT ON GS SCALE
RADIO ALTITUDE
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