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HDG
AUTOMATIC FLIGHT CONTROL SYSTEM
May 06/2005 Flight Crew Operating Manual Volume 2
REV 2 CSP 100-6 04-01-09
FLIGHT DIRECTOR LATERAL MODES (Cont)
NAV MODE
This mode is activated by pushing the (NAV) switch on the FGP, and it can be deselected in one of the following ways:
- Pushing NAV switch again
- Selecting another lateral mode
- Changing the frequency of the onside navigation signal
- Changing the NAV source
- Turning off the flight directors with the AP disengaged
- Changing coupled side
Navigation mode generates commands to capture and track the active navigation source, displayed on the PFD. Navigation
mode arms when it is selected, but it cannot capture if the FGC is not receiving valid navigation data.
The following are navigation submodes:
- FMS navigation mode
- VOR navigation mode
- LOC and backcourse mode
Prior to capture, the flight director operates in heading mode. The capture point is a function of closure rate. Navigation
capture clears the heading select mode. A localizer capture also clears the half bank mode.
Dead reckoning operation is executed during the VOR station passage.
When navigation mode is selected, the active lateral mode is annunciated on the PFD by the green HDG (in lateral capture
field) and the armed navigation is annunciated in and a white Nav source identifier (VOR1, VOR2, LOC1, LOC2, FMS1,
FMS2 in the lateral arm field). Navigation mode capture/tracking is annunciated on the PFD with a green message in the
lateral capture field, which identifies the navigation source (VOR1, VOR2, LOC1, LOC2, FMS1, FMS2). Dead reckoning
operation is annunciated on the PFD by a small green DR letters, added to the lateral nav capture annunciation.
The flight director provides a NAV to NAV capture logic that allows automatic transition from FMS navigation to LOC or
back course mode, when FMS is the selected NAV source.
CFO0401002_011
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ISA -5 ° C
LNV 1 VS
REV 2
AUTOMATIC FLIGHT CONTROL SYSTEM
Volume 2 Flight Crew Operating Manual May 06/2005
04-01-10 CSP 100-6 REV 2
FLIGHT DIRECTOR LATERAL MODES (Cont)
GO AROUND MODE
When airborne, pressing either TOGA switch activates the lateral and vertical go-around modes. Lateral go-around mode
generates a heading hold command with a five degree bank angle authority. Lateral go-around is annunciated with a green
GA message in the lateral capture field of the PFD.
Pushing the TOGA switch disengages the autopilot. The resultant autopilot warning may be cancelled by another push of
the TOGA switch or by pushing the MWS switch on the control wheel.
GA is deselected if the following occurs:
- Autopilot engagement.
- Another lateral or vertical mode is selected.
- Pressing the SYNC button, which selects pitch and roll modes.
- Turning off the Flight Directors.
- Changing the coupled side.
Selection of GA causes the flight directors to operate independently. Selection of GA mode disengages the autopilot (but
not the Yaw Damper), and clears all other existing modes.
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4200
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AP YD PTCH
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350 16000
350 00
4
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100
00
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352 00
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29.92 IN
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° C
11 : 42
SAT -15
ISA -5 ° C
VOR1
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350 16000
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29.92 IN
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1
UTC
° C
11 : 42
SAT -15
ISA -5 ° C
20
10
ALTS
GA YD GA
20
10
EV 2
AUTOMATIC FLIGHT CONTROL SYSTEM
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