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AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
04−10−16
LATERAL NAVIGATION MODES (CONT'D)
Localizer (LOC) Mode
Localizer mode provides for automatic intercept, capture and tracking of the front course localizer
beam, to line up on the centreline of the runway in use.
Localizer capture and tracking commands are based on the distancetotransmitter.
The FMS will
output the distance to tuned navaid or distance to destination, based on the following conditions:
· If the FMS is used to autotune the LOC, the FMS will output the distancetostation
the
tuned LOC transmitter.
· If the FMS is tuned manually by LOCfrequency
on the CDU, the FMS will output the
distance to the tuned LOC transmitter, regardless of approach or flightplan.
· If the LOC frequency is manually tuned with a LOCfrequency
on the CDU, or if tuned on the
RMU, and the FMS will output distance to destination selected in the flight plan.
· If the LOC frequency is manually tuned with a LOCfrequency
on the CDU, or if tuned on the
RMU, and the FMS does not have a destination selected, no distance information will be
output by the FMS. In this case, the AFCS will use estimated distance.
The AFCS priority for determining distance to LOC transmitter is:
· Distancetostation
(DME) information, if the DME is valid and colocated
with the locator
transmitter.
· If DME information is not available, or not colocated,
the distance to localizer is based on
radio altitude, true airspeed, glideslope deviation and an assumed flight path angle of 3°.
· If, in addition to invalid DME, the radio altitude is invalid, the AFCS will use FMS distance
information.
If a destination other than the one designated in the FMS flight plan is used and the
LOCfrequency
is manually tuned with a LOCfrequency
on the CDU, or on the RMU, and DME
and RAD ALT are not available, the FMS will output erroneous distance to destination data. To
prevent potential problems in this circumstance, a limit was placed on the value the AFCS will
accept from the FMS for distance (30 nm). Testing showed that when performing a closein
capture (710
nm) using the maximun value for distance (30 nm), the LOC overshoots on initial
capture were within acceptable limits and were damped out within 2 oscillations.
FD roll commands are ± 30° when capturing localizer. During localizer track mode, the roll
commands are ± 24°.
Roll rate commands are 7°/sec during capture and 5.5°/sec during track modes.
The optimum intercept angle is 45°. If intercept angle is greater than 45°, course cut limiting may
occur. As LOC moves from ARMED to ACTIVE, the LOC will flash for approximately 5 seconds,
when active.
HDG
LOC Armed.
LOC
Active. “LOC” will flash for approximately 5 seconds, when active.
AUTOMATIC FLIGHT CONTROL SYSTEM
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
04−10−17
LATERAL NAVIGATION MODES (CONT'D)
Localizer (LOC) Mode (Cont’d)
090°
INBOUND
COURSE
LOCALIZER
TX
LOCALIZER MODE CAPTURE
HDG
040
RUNWAY
090°
INBOUND
COURSE
LOCALIZER
TX
TYPICAL CAPTURE POINT,
BETWEEN 1 AND 2 DOT
LOCALIZER MODE INTERCEPT
HDG
040
RUNWAY
SELECTED
HEADING
040°
HDG
040
LOCALIZER MODE TRACK
RUNWAY
LOCALIZER
TX
MDA
MIDDLE
MARKER
OUTER
MARKER
RAD ALT = 1200’
CRS
090
CRS
090
CRS
090
LOC1 10.0 NM LOC1
SRP
7.0 NM
SRP
LOC1 5.0NM
SRP
HDG AP1 ALT
LOC
LOC AP1 VS
VOR
N
6
33
E
W
24
21
s
15
30
12
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N
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LOC AP1 ALT
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AUTOMATIC FLIGHT CONTROL SYSTEM
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
04−10−18
LATERAL NAVIGATION MODES (CONT'D)
　
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