the event that the KCP
420
Flight
Computer cancels an active mode
due to
loss
of required navigation sig-
nal or system malfunction. Engaging
the KFC
400
in any tracking mode
automatically cancels the correspond-
ing default mode.
control unit for flight director mode
selection, the KAV
485
Attitude/ Verti-
cal Speed Indicator and the
Go-
Around Pushbutton also provide con-
trol of certain flight director modes.
While the KMS
446
is the central
Roll
Attitude Hold/Pitch Attitude
Hold (Not Annunciated)
Roll
Attitude Hold and Pitch Atti-
tude Hold, the flight director’s default
modes, engage automatically in the
absence of any active tracking
modes. Upon initial activation, the
flight director generates commands
for wings-level flight at the existing
pitch attitude.
Target roll and pitch attitudes may
be modified by adjusting the aircraft’s
attitude manually while pressing the
CWS Pushbutton. Alternatively, Atti-
tude Hold commands may be modi-
fied through use of the autopilot’s Roll
Attitude and Vertical Trim controls
(see
Autopilot Operations, page
40).
After release of the CWS push-
button or autopilot attitude controls
the flight director displays commands
to maintain the pitch and roll attitudes
selected.
If
the selected roll attitude is
less
than
two
degrees, the KFC
400
will command a return to wings-level
flight..
tracking mode cancels
Roll
Attitude
Hold or Pitch Attitude Hold, respec-
tively. Either mode may be used in
conjunction with any Arm mode, how-
ever, and can provide flight guidance
for course or altitude interceptions.
Selecting any horizontal or vertical
Control
Wheel
Steering
(CWS)
CWS allows the crew to synchro-
nize flight director commands in pitch
and roll. When the flight director
mode selected is pitch attitude hold,
altitude hold, airspeed hold, MACH
hold, wings level or roll attitude hold,
CWS will cause a new reference to be
established upon release. All com-
mands will then be directed to hold
this new reference.
Heading (HDG)
In the Heading mode the flight di-
rector commands roll attitudes neces-
sary to track the heading indicated by
the bug position on the KPI
5538
HSI
or EFS
10
EHSI.
Activating the Heading mode can-
cels
any other horizontal tracking
mode. The Heading mode may be
used during Nav Arm or Approach
Arm sequences, but disengages auto-
matically in favor of Nav or Approach
Capture or Track functions.
Nav (NAV/NAV ARM)
With the Nav mode engaged, the
flight director commands roll attitudes
necessary to track the course
select-
ed on the HSI or EHSI. Separate gain
schedules are used depending on the
selected navigation sensor to provide
optimum performance.
Upon selection, the Nav mode
engages either Nav Arm or Nav Cap-
ture, depending upon the aircraft’s
proximity to the selected course and
its closure rate. While any horizontal
tracking mode may be engaged in
conjunction with Nav Arm to provide
intercept guidance, initiation of Nav
Capture and Track sequences can-
cels the coexisting mode.
35
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