If
the aircraft's deviation from the
selected course centerline is suffi-
ciently small, or
if
the rate of closure
with the new course is sufficiently
high, the flight director initiates the
Nav Capture sequence immediately.
Approach (APR ARMIAPR)
The Approach mode is similar to
the Nav mode with regard to Arm,
Capture and Track operations.
Upon initial selection the Ap-
proach mode engages in either Ap-
proach Arm or Capture, depending on
the aircraft's closure rate and proxim-
ity to the selected course. Due to the
heightened sensitivity of the deviation
display in the Approach mode, the
flight director may initiate turn com-
nds before the course deviation
icator displays less than a full scale
lection. Selecting the Approach
mode after the aircraft has already
passed the point
at
which Approach
Capture normally would begin may
result initially in course overshoot due
to
the flight director's roll command
limits.
matically between front course and
back course approaches, and VOR,
VOR RNAV, TACAN and
MLS
proce-
dures. While the KFC
400
uses this
information to determine the type of
navaid involved, front coursehack
course selections are determined by
the relative angle between the air-
craft's heading and the course select-
ed on the HSI or EHSI. Intercept
angles between
0'
and
105"
cause
the KFC
400
to select the
ILS
front
course. Angles between 106' and
180'
cause the flight director to com-
mand back course interception and
tracking.
It is essential that the course
selector arrow on the navigation dis-
day always be aligned with the ILS
The KFC
400
discriminates auto-
front
course.
Failure to algn the
course arrow properly may result in
erroneous front coursehack course
selection
by
the
KFC
400.
The flight director automatically
engages Glideslope Arm
(GS
ARM),
Capture and Track
(GS)
sequences
during
ILS
front course approaches.
Glideslope coupling is inhibited during
back course procedures.
Any horizontal tracking mode may
be employed during Approach Arm
phases, but will cancel automatically
upon initiation
of
Approach Capture
and Track.
Flight Dlrector (FD)
Activating the Flight Director mode
with the
KMS
446 selector key initi-
ates flight director functions indepen-
dently of the autopilot or yaw damper.
The flight director will engage
Roll
Attitude Hold and Pitch Attitude Hold
and the command bars will come into
view synchronized to the current air-
craft attitude.
Roll
attitudes of less
than
2"
will revert to wings-level flight.
It
is not necessary to press the
flight director key prior to selecting
another flight director mode. Selecting
any flight director mode initiates flight
director commands in that mode.
Press the FD selector key again to
disengage the flight director. The flight
director will not disengage
if
the au-
topilot is in use.
Mach
Hold
(MACH)
In the Mach Hold mode the flight
director commands pitch attitudes to
maintain the aircraft Mach speed cur-
rent at the moment of selection.
Mach Hold commands may be
altered through use of the autopilot
pitch trim rocker switch at the rate of
.01 Mach per "click" or
.002
Mach per
second.
36
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