BendixKing KFC 500 - Manual (Page 36)

35
The KAV 485 Altitude/Vertical
Speed Indicator provides centralized
display and control of some of the
KFC 500’s most commonly used
altitude and vertical speed functions.
Display features include an
electrically driven altimeter and
instantaneous vertical speed
indicator (IVSI); altitude and vertical
speed preselect; barometric
correction; and an altitude alerter.
Controls for altitude/vertical speed
selection and barometric altimeter
setting are included, along with mode
selector keys for activating the
functions of the Vertical Speed and
Altitude Select.
The KAV 485 Altitude/ Vertical
Speed Indicator includes a
preflight/self-test function that
ensures integrity of the display and
command features. Illumination of
the display is adjusted automatically
by a photocell integrated into the top
right portion of the unit.
Display Features
A photocell is placed on the indicator
bezel for automatic dimming of the
display.
Altimeter — Displays barometric
altitude information derived by the
KDC 481T Central Air Data
Computer. The digital portion of the
display provides resolution to within
20 feet when the aircraft’s vertical
speed is less than 1000 fpm; and to
within 100 feet when vertical speed
is greater than 1000 fpm.
ALT Flag — The “ALT” flag and dig-
ital “FAIL” annunciator appear as
necessary to indicate invalid
altimeter information.
Altimeter Setting — Displays the
current barometric pressure setting.
Units are displayed in either inches
of mercury (In Hg.) or hectoPascals
(HPa), as annunciated beneath the
numeric display. The display units
are changed by depressing the push-
button (1) in the upper left corner of
the indicator.
Altimeter Setting Selector/Push-
to-Test Control — Dual concentric
rotary knobs, with the smaller, inside
knob also featuring pushbutton oper-
ation, control the barometric altimeter
setting. The smaller, inner knob
adjusts the single-hectoPascal or
hundredths-inch portion of the dis-
play with automatic rollover to higher
digits. The larger, outer knob adjusts
the altimeter setting in tens-of-
hectoPascals or tenths-of-inches. It
also features automatic roll-over.
Pressing the smaller knob acti-
vates the air data system’s self-test
feature, described in “Preflight
Procedures” on page 44.
Depressing again, terminates the
self-test procedure.
Inches of Mercury/HectoPascal
Pushbutton
— Depressing the
pushbutton alternates calibration of
the altimeter setting display between
inches of mercury (in HG) and
hectoPascals (HPa), as annunciated.
KAV 485 Altitude/Vertical Speed Indicator