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quick changes. This occurs when the airplane flies over the
VOR station in the cone-of-confusion. If the deviation beam rate
of change is more than 0.75 degrees per second, the FCC goes
to the OSS submode. If the magnitude of the deviation beam
changes is more than 6.0 degrees, the VOR also goes to the
OSS submode.
The FCC stays in the OSS submode for 23 seconds after the
beam deviation changes go below these OSS levels. If a DME is
collocated with the VOR, the FCC also goes into the OSS
submode if the absolute value of the airplane altitude minus the
DME range is less than 5000 feet. This allows the airplane to go
through the cone-of-confusion and also make a turn.
DFCS - OPERATION - VOR
EFFECTIVITY
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The airplane will not bank more than the selected bank angle
limit. The maximum roll rate is 4.0 degrees per second.
When the VOR is in the OSS submode, VOR/LOC shows in large
green letters on the first line of the roll position of the FMA. The
FCC stays in this submode until the airplane satisfies the oncourse
logic.
If the crew pushes the VOR LOC mode selector switch or
selects another roll mode, the VOR mode is deselected. The
VOR mode is also deselected if the VOR signal is not valid for
more than 8 seconds and the A/P is in CMD.
DFCS - OPERATION - VOR
EFFECTIVITY
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DFCS - OPERATION - VOR
DFCS - OPERATION - VOR
EFFECTIVITY
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DFCS - OPERATION - VOR
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General
In roll control wheel steering (CWS), the pilot controls the
airplane as if the A/P is disengaged. The control of the airplane
is from a roll CWS force transducer and through the FCC. The
CWS mode has these submodes:
* Attitude hold
* Heading hold
* Roll CWS out-of-detent (O/D).
These are the three ways to engage the roll CWS mode:
* Push the CWS A/P engage switch
* Push the CMD A/P engage switch and do not select a roll
mode
* When a roll CMD mode is active, apply a wheel force of more
than 10 pounds (hi detent).
The FMA annunciation is the amber CWS R in the DFCS status.
The force on the control wheel, while in CWS, is one of these
three levels:
* In-detent, less than 2.25 pounds if bank angle is 30 degrees
or less, or less than 3.0 pounds if bank angle more than 30
degrees
* Low detent, more than in-detent level but 10 pounds or less
* Hi detent, more than 10 pounds of force.
Attitude Hold Submode
If the bank angle is more than 6 degrees when you engage the
CWS mode, the A/P goes to the attitude hold submode. In this
submode, the A/P holds the airplane bank to the roll attitude at
the time the A/P enters the CWS mode.
The bank limit is 30 degrees. If the bank angle is more than 30
degrees when the A/P is in CWS and the control wheel force is
in-detent, it decreases to and holds 30 degrees. The bank rate of
change limit is 4.0 degrees per second.
Heading Hold Submode
If the bank angle is less than 6 degrees when you engage the
CWS mode, the A/P goes to the heading hold submode. In this
submode, the A/P decreases the bank angle to 0 degrees within
3 seconds. The A/P then maintains the airplane heading.
If the bank angle is more than 30 degrees when you engage the
CWS mode, the bank angle decreases to 30 degrees. The bank
rate of change limit is 4.0 degrees per second.
Roll CWS O/D
When the control wheel force is not in-detent, the pilot controls
the airplane bank. The roll CWS force transducer sends a signal
to the FCC and the FCC sends a control signal to the A/P
actuators.
DFCS - OPERATION - ROLL CWS
EFFECTIVITY
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