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pitch F/D command is NCD.
DFCS - FUNCTIONAL DESCRIPTION - F/D FLAG AND BOV
EFFECTIVITY
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The failure warning signal causes the F/D flag to appear on the
CDS and the F/D command to BOV.
DFCS - FUNCTIONAL DESCRIPTION - F/D FLAG AND BOV
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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DFCS - FUNCTIONAL DESCRIPTION - F/D FLAG AND BOV
DFCS - FUNCTIONAL DESCRIPTION - F/D FLAG AND BOV
EFFECTIVITY
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22-11-00-063
General
The table shows the conditions that cause the flight director (F/
D) to bias out of view (BOV) the F/D integrated cue. The F/D
integrated cue will BOV because the roll mode is BOV.
BOV Conditions
These conditions cause the flight director to BOV:
* The roll command is BOV when the F/D is off except when
the F/D is in the pop-up mode
* The roll command is BOV when the F/D is on and the crew
did not set a roll mode
* The selected VOR or LOC receiver is invalid. There is an 8-
second delay for the VOR signal and a 2-second delay for the
LOC signal
* The LVAV signal from the flight management computer
(FMC) is invalid
* The crew tunes to a VOR frequency after localizer capture.
Also the other A/P is in CMD and LOC capture, however, the
local VHF navigation control panel is tuned to a VOR
frequency
* The radio altimeter is invalid for more than 2 seconds and
the F/D is in the LOC capture mode
* The other A/P is in CMD and VOR capture, however, the local
VHF navigation control panel is tuned to a LOC frequency
* The flare mode is active
* The true airspeed (TAS) is invalid
* The lateral acceleration from the ADIRU is invalid
* The magnetic track angle from the ADIRU is invalid
* The roll angle from the ADIRU is invalid
* The magnetic heading from the ADIRU is invalid
* A transfer of the IRS transfer switch to the BOTH ON R or the
BOTH ON L position will BOV the F/D roll display
* An AC bus transfer with no A/P in CMD, both F/Ds are on,
and above 800 feet will BOV the F/D roll display. If the
transfer occurs below 800 feet, the F/D commands come
from the other FCC
* The F/D comparator compares the roll commands from both
F/Ds. If the difference is more than the set limit, the F/D roll
display is BOV
* If the NAV transfer switch is in the BOTH ON 1 position,
neither A/P is in CMD, and both F/Ds are on, F/D B will BOV.
If the NAV transfer switch is in the BOTH ON 2 position,
neither A/P is in CMD, and both F/Ds are on, F/D A will BOV
* An MCP bus invalid signal causes the roll F/D display to
BOV. For the takeoff (T/O) and go-around (G/A) modes this
occurs when below 400 feet
* The roll rate from the ADIRU is invalid.
DFCS - FUNCTIONAL DESCRIPTION - F/D ROLL MODE BOV LOGIC TABLE
EFFECTIVITY
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22-11-00-064
DFCS - FUNCTIONAL DESCRIPTION - F/D ROLL MODE BOV LOGIC TABLE
DFCS - FUNCTIONAL DESCRIPTION - F/D ROLL MODE BOV LOGIC TABLE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-064
General
The table shows the conditions that cause the flight director (F/
D) to bias out of view (BOV) the F/D integrated cue. The F/D
integrated cue will BOV because the pitch mode is BOV.
BOV Conditions
These conditions cause the flight director to BOV:
* The pitch command is BOV when the F/D is off except when
the F/D is in the pop-up mode
* The pitch command is BOV when the F/D is on and the crew
did not set a pitch mode
* The foreign A/P is in CMD and G/S engaged, however, the
local VHF navigation control panel is tuned to a VOR
frequency
* The radio altimeter is invalid for more than 2 seconds
* The selected G/S receiver is invalid. There is a 2 second
delay for the G/S signal
　
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