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FMS Navigation Mode
Figure 04−10−22
Approach Mode
Approach mode is used to fly a localizer-based (ILS) or FMS-based nonprecision approach.
During approach mode, the flight directors operate in dual independent mode.
Approach mode is selected by pressing the APPR button on the FCP. The displayed navigation
source will determine which approach submode will be in operation.
ILS-Based Approach
Pushing the APPR button alternately selects and clears approach mode. Approach mode
localizer capture functions the same as localizer navigation (NAV) mode. Additionally,
glideslope (GS) mode is armed for capture.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
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FLIGHT DIRECTORS (CONT'D)
Automatic NAV-to-NAV Transfer
When a localizer-based approach is selected from the FMS and the aircraft is within 30 nm of
the airport, the localizer frequency is automatically tuned and the course display is set to the
appropriate inbound course. The localizer deviation scale and pointer are superimposed in
cyan on the PFD HSI, and a cyan LOC1 (or LOC2) navigation source is displayed beside the
active navigation source (FMS 1 or FMS 2).
With approach mode armed (APPR button selected on FCP) during localizer intercept, the
active navigation source will automatically change from FMS to LOC (automatic NAV to NAV
transfer) at localizer capture. If required, approach mode can then be canceled and navigation
mode selected by pressing the NAV button on the FCP.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
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FLIGHT DIRECTORS (CONT'D)
ILS Approach Mode
Figure 04−10−23
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
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FLIGHT DIRECTORS (CONT'D)
FMS-Based Approach
Pushing the APPR button alternately selects and clears approach mode. The FMS-based
approach mode functions the same as FMS Navigation (LNV) mode. Additionally, glide path
(GP) mode is armed for capture to track the desired glide path from the FMS if VNAV is
selected.
Refer to the Collins FMS–6000 Flight Management System Pilot’s Guide for additional
information on FMS-based approaches.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
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FLIGHT DIRECTORS (CONT'D)
FMS Approach Mode
Figure 04−10−24
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
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FLIGHT DIRECTORS (CONT'D)
Localizer Back Course Mode
Back course mode (B/C) generates commands to track a localizer signal using reverse-sensing.
Back course mode is armed by pressing the B/C button on the FCP. Back course mode localizer
capture is the same as NAV mode; B/C1 (or B/C2) shows in white in the armed lateral mode
field on both PFDs. When armed, the FCC operates in a heading select submode until capture
of the localizer occurs.
If the back course approach is selected from the FMS, the localizer frequency is tuned
automatically and the course display is set to the appropriate inbound course. With back course
mode armed, the active navigation source will automatically change from FMS to LOC
(automatic NAV to NAV transfer) at localizer capture.
After capture, the FCC generates commands to track the reciprocal of the selected course. The
front course track must be set in order to have valid B/C guidance. Capture of the back course is
indicated by a green B/C1 or B/C2 in the active field of the FMA. Glideslope is inhibited when
B/C mode is active.
Back course mode is cleared by selecting another lateral mode, or by changing the active side
navigation source or frequency.
Back Course Mode
Figure 04−10−25
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
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FLIGHT DIRECTORS (CONT'D)
Lateral Takeoff
On the ground, pushing either TOGA (takeoff/go-around) button mounted on the thrust levers
selects takeoff mode and clears all other lateral modes. Lateral and vertical takeoff mode
selections are coincident. When takeoff mode is active, a green TO appears in the active lateral
field of the FMA. During takeoff mode, the flight directors operate in dual independent mode.
　
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