BendixKing KFC 500 User Manual

Page 15

localizer and then depress the APR
pushbutton to activate Approach
Mode when tracking inbound on the
appropriate course.

When the KFC 500 is coupled to

a flight management system (FMS)
that has a composite steering com-
mand to drive the flight director (ie.
KLN 90, KNS 660), the flight man-
agement system has complete con-
trol of bank angles up to 25°. Bank
limiting when coupled to a FMS is
inhibited in this situation to prevent
poor tracking performance.

Bank Angle Limit may be

engaged in conjunction with any
flight director tracking mode.
However, it’s operation will be inhib-
ited in the Approach mode and when
coupled to a FMS.

NAV (capture and track selected
navigation sensor)

The nav lamp illuminates and “NAV”
is displayed in the lateral mode win-
dow of the EADI when the NAV or
NAV ARM mode is activated by
depressing the NAV pushbutton on
the KMS 540 Mode Select Panel.
When the NAV mode is selected by
the NAV pushbutton and course nee-
dle deflection exceeds the capture
requirements of NAV mode (greater
than 50% full scale needle devia-
tion), the NAV ARM mode is acti-
vated and allows a compatible lateral
mode to be used to intercept the
desired course or track. If the air-
craft’s deviation from the selected
course centerline is sufficiently small
(less than 50% full scale needle devi-

ation), or if the rate of closure with
the new course is sufficiently high,
the flight director initiates the NAV
Capture sequence immediately.

A flashing NAV lamp indicates

loss of a sensor required to capture
or track the selected nav (e.g. invalid
NAV, invalid selected course) and
continues until a second push of the
NAV pushbutton (pilot acknowledge-
ment of mode loss). In the event of a
sustained NAV invalid during NAV
ARM, the current lateral mode will
remain active until another mode is
selected. The NAV pushbutton may
also be used to deactivate the NAV
mode.

APR (capture and track selected
sensor with approach authority)

The approach lamp on the mode
select panel illuminates when the
approach or approach ARM mode is
activated by depressing the APR
pushbutton. Upon initial selection,

APR

☛

TST

BRT

1
2

SYNC

REF

DIR

A
V

A
R
C

H
S

CRS

090

7.5

010°

140

NAV

☛

Selected Course

Course Pointer

Course Select Knob