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Like the A/P, the F/D may be called one of these names:
* Channel A or channel B.
* Local (LCL) or foreign (FGN)
* Master or slave.
It is the same for the F/D as it is for the A/P, except for the
master/slave relation when at least one A/P is engaged. If an A/
P is engaged in CMD, it is the master.
F/D Pitch and Roll Controls
The FCC uses almost the same control laws to calculate the F/D
pitch and roll commands as it uses to calculate the A/P pitch
and roll commands.
The FCC does not use surface position sensor data to calculate
the F/D commands because the F/D does not move the control
surfaces. The F/D commands go to the DEUs to show on the
common display system (CDS) instead of to the A/P actuators.
F/D Commands BOV
The autopilot disengages if a non-normal condition occurs. For
flight director, the flight director commands on the CDS are
biased out of view so the pilot cannot see them.
F/D Comparator
The flight director comparator operates during these conditions:
* Takeoff mode and below 400 feet
* Go around mode and below 400 feet
* Approach mode and below 800 feet.
During this time, the F/D comparator detects the F/D failures
which are not detected by continuous monitoring or
annunciated by a sensor valid and which could provide
erroneous information to the pilot-in-command. In each FCC,
this monitor compares local pitch and roll F/D commands with
the corresponding cross-channel F/D commands. The local F/D
only is BOV if the difference exceeds a given value.
Fault Detection
The fault detection circuit continually monitors the operation of
the FCC. If it finds a failure, it sends a signal to the CDS to show
the F/D flag on the attitude indicator.
DFCS - FUNCTIONAL DESCRIPTION - FLIGHT DIRECTOR COMMANDS
EFFECTIVITY
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General
The bias out of view (BOV) and failure warning circuits in the
FCCs monitor important flight director (F/D) and FCC functions.
Under certain conditions, the F/D command display on the
common display system (CDS) does not show and the F/D flag
shows. The FCC also selects which FCC is the master.
MCP
The MCP has two switches that turn on or off F/D A or F/D B.
There is a master flight director indicator light above each F/D
switch. This light shows which FCC is the master FCC.
FCC
The flight director (F/D) bias out of view (BOV) circuits monitor
these items:
* Operation
* Power
* Components.
During normal conditions, the F/D commands show on the CDS
when the crew turns on a F/D switch. If conditions are not
normal, the F/D commands to the display electronic units
(DEUs) is no computed data (NCD). The F/D roll and pitch mode
BOV tables show when the F/D commands are BOV.
The FCC calculates a failure warning signal if any of these
conditions exist:
* No FCC power
* Failure of internal power supply
* Loss of FCC heartbeat monitors
* Loss of F/D monitors
* Failure of servo amplifiers.
A cross channel digital bus supplies F/D commands and BOV
data between the FCCs. Normally the flight directors operate
independently. However, if the local power bus transfers under
these condition, the switched FCC will get F/D commands from
the other FCC:
* When in TO/GA at any altitude
* When in F/D approach with G/S and LOC engaged and under
800 feet.
Master FCC
With one or both autopilots in CMD, the master FCC is the
autopilot first in CMD. If no autopilot is in CMD, the first F/D on is
the master FCC. These are three conditions when only the F/Ds
are on and both FCCs are the master:
* In approach with G/S engaged and LOC capture
* In G/A with radio altitude less than 400 feet
* In T/O with radio altitude less than 400 feet.
CDS
The FCC biases the entire symbol out of view if either roll or
　
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