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If the FMS is used to autotune the LOC, the FMS will output the distance-to-station the tuned LOC transmitter.
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If the FMS is tuned manually by LOC-frequency on the CDU, the FMS will output the distance to the tuned LOC transmitter, regardless of approach or flightplan.
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If the LOC frequency is manually tuned with a LOC-frequency on the CDU, or if tuned on the RMU, and the FMS will output distance to destination selected in the flight plan.
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If the LOC frequency is manually tuned with a LOC-frequency 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:
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Distance-to-station (DME) information, if the DME is valid and co-located with the locator transmitter.
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If DME information is not available, or not co-located, the distance to localizer is based on radio altitude, true airspeed, glideslope deviation and an assumed flight path angle of 3°.
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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 LOC-frequency is manually tuned with a LOC-frequency 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 close-in capture (7-10 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.
Armed.
Active. “LOC”will flash for approximately 5 seconds, when active.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
AUTOMATIC FLIGHT CONTROL SYSTEM
LATERAL NAVIGATION MODES (CONT'D)
Localizer (LOC) Mode (Cont’d)
SELECTED
HEADING
090°
INBOUND LOCALIZER TX
RUNWAY
LOCALIZER MODE CAPTURE
BETWEEN 1 AND 2 DOT
LOCALIZER MODE INTERCEPT
OUTER MIDDLE
RUNWAY
MARKER MARKER
LOCALIZER MODE TRACK
GF0410_046
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
中国公务机网 www.gongwuji.com
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本文链接地址：庞巴迪环球5000公务机机组操作手册 Bombardier Global-自动飞行控制系统(9)
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