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* This is an unsafe flight condition. The F/D is in a speed
mode, the airplane should be climbing but it is not, and it
approaches a stall
* This is another unsafe flight condition. The F/D is in a speed
mode, the airplane should be descending but it is not, and it
approaches the VMO/MMO limit
* The MCP is set for a higher altitude, however, the FMC
command is V/S descent. There is a 0.5 second delay
* The MCP is set for a lower altitude, however, the FMC
command is V/S climb. There is a 0.5 second delay
* The FMC target V/S is invalid.
* The autopilot is in the G/A mode, but the F/D does not go into
G/A because of a failure. This causes the pitch F/D command
to BOV
* The flare mode is active
* An AC bus transfer with no A/P in CMD, both F/Ds are on,
and above 800 feet will BOV the F/D pitch display. If the
transfer occurs below 800 feet, the F/D commands come
from the other FCC
* 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
* The pitch angle and vertical speed from the ADIRU are
invalid.
* The roll angle from the ADIRU is invalid.
DFCS - FUNCTIONAL DESCRIPTION - F/D PITCH MODE BOV LOGIC TABLE 1
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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DFCS - FUNCTIONAL DESCRIPTION - F/D PITCH MODE BOV LOGIC TABLE 1
DFCS - FUNCTIONAL DESCRIPTION - F/D PITCH MODE BOV LOGIC TABLE 1
EFFECTIVITY
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General
This table also 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 also cause the flight director to BOV:
* The pitch attitude rate data from the ADIRU is invalid
* The vertical acceleration from the ADIRU is invalid
* The longitudinal acceleration from the ADIRU is invalid
* The static pressure from the ADIRU is invalid
* The true airspeed from the ADIRU is invalid
* The baro uncorrected altitude from the ADIRU is invalid
* The baro corrected altitude from the ADIRU is invalid
* The computed airspeed from the ADIRU is invalid
* The mach data from the ADIRU is invalid
* The F/D comparator compares the pitch commands from
both F/Ds. If the difference is more than the set limit, the F/D
pitch display is BOV
* The FMC target altitude is invalid
* The FMC target airspeed/mach is invalid
* An MCP bus invalid signal causes the pitch F/D display to
BOV. For the takeoff (T/O) and go-around (G/A) modes this
occurs when below 400 feet
* The flight path acceleration from the ADIRU is invalid
* If the foreign F/D pitch display is BOV and there is an AC bus
transfer, the local F/D pitch display will BOV.
DFCS - FUNCTIONAL DESCRIPTION - F/D PITCH MODE BOV LOGIC TABLE 2
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-066
DFCS - FUNCTIONAL DESCRIPTION - F/D PITCH MODE BOV LOGIC TABLE 2
DFCS - FUNCTIONAL DESCRIPTION - F/D PITCH MODE BOV LOGIC TABLE 2
EFFECTIVITY
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General
The FCCs compare baro-corrected altitude with the selected
reference altitude on the mode control panel (MCP). If the
difference is within certain limits, the FCC causes an altitude
alert warning.
FCC A uses the captain baro-corrected altitude from the left
ADIRU and FCC B uses the First Officer baro-corrected altitude
from the right ADIRU.
Altitude Alert Function
When you approach the selected altitude from above or below
and are 900 feet from the selected altitude, the altitude alert
starts. The alert consists of a one-second aural warning and a
bright white box around the airplane altitude display and the
selected altitude display on the common display system (CDS).
The visual warning continues until the airplane is less than 300
　
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