BendixKing KI 525A System KFC 225 - Manual (Page 12)

System Operation
6 KFC 225 AUTOMATIC FLIGHT CONTROL SYSTEM
Rev. 0
Apr/99
6. NAVIGATION ( NAV ) MODE
SELECTOR BUTTON - When
pressed, will arm the navigation
mode. If the selected navigation sen-
sor is less than 50% deflected when
armed, the system will automatically
capture. Otherwise the capture point
will vary based on needle deflection
and closure rate. The mode provides
automatic beam capture and track-
ing of VOR, LOC or GPS as
selected for presentation on the HSI.
NAV mode is recommended for en
route navigation tracking. If pressed
when NAV mode is either armed or
coupled, will disengage the mode.
This button will engage the flight
director.
7. APPROACH ( APR ) MODE
SELECTOR BUTTON - When
pressed, will arm the Approach
mode. If the selected navigation sen-
sor is less than 50% deflected when
armed, the system will automatically
capture. Otherwise the capture point
will vary based on needle deflection
and closure rate. This mode pro-
vides automatic beam capture and
tracking of VOR, GPS or LOC with
Glideslope (GS) on an ILS, as
selected for presentation on the HSI.
APR ARM will annunciate. If pressed
when APR mode is either armed or
coupled, will disengage the mode.
This button will engage the flight
director. (See the NOTE following
item 8).
8. BACK COURSE APPROACH
( REV ) MODE SELECTOR BUTTON
– (not available when optional ED
461 EHSI installed). When pressed,
will select the back course approach
mode. If the selected navigation sen-
sor is less than 50% deflected when
armed, the system will automatically
capture. Otherwise the capture point
will vary based on needle deflection
and closure rate. This mode func-
tions similarly to the approach mode
except that the autopilot response to
LOC signals is reversed and glides-
lope is inhibited. This button will
engage the flight director.
NOTE: If the optional ED 461
EHSI is installed, front and back
course selection is automatic and is
dependent upon the relative differ-
ence between the airplane heading
and the selected approach course. If
the airplane heading differs from the
selected course by greater than
105°, REV ARM will automatically
annunciate in anticipation of tracking
a localizer back course. If prior to
localizer capture the heading
changes (ie. during radar vectors or
a procedure turn) and falls within
105° of the selected course, APR
ARM will annunciate in anticipation
of tracking the localizer front course.
9. ALTITUDE HOLD ( ALT ) MODE
SELECT BUTTON - When
pressed, will engage the Altitude
Hold mode. The altitude maintained
is the altitude at the moment the ALT
button is pressed. If the ALT button
is pressed with an established climb
or descent rate present, there will be
approximately a 10% (of VS rate)
overshoot, with the airplane returned
positively to the selected altitude. If
pressed when ALT hold mode is
engaged, will disengage the mode,
defaulting to PIT mode. This button
will engage the flight director.