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The standby airspeed indicator displays aircraft
airspeed (Figure 16-50). It measures the
ram and static air pressures directly from the
pilot-side pitot-static system, and presents the
airspeed on a single pointer indicator. The
pointer is referenced against a dial marking to
CAUTION
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Figure 16-49. Standby Attitude Indicator
display the indicated airspeed. VMO is marked
with a red line at 250 KIAS.
To determine MMO limits, compare indicated
altitude to the placarded altitudes, and determine
the corresponding limiting calibrated
airspeed (KCAS) from the table.
When relying only on standby airspeed,
use caution to remain below
VMO and MMO.
Green and red LEDs on the upper left corner
of the bezel provide self-test indications during
power-up.
NOTE
When power is applied to the standby
airspeed indicator, the green and red
LEDs flash and the standby airspeed
indicator needle rotates clockwise to
the maximum limit, then counterclockwise
to the zero-park position.
After completion of the needle travel
test, the needle returns to the measured
pressure, and normal operation of the
instrument begins.
If the red LED illuminates or the green LED
is dark, the instrument is not operational and
maintenance is required.
The instrument pointer may be tested by pushing
the built-in test (BIT) switch on the lower
right bezel.
STANDBY ALTIMETER DISPLAY
The standby altimeter displays aircraft altitude
(Figure 16-51). The instrument measures the
static air pressure directly from the pilot-side
static system. It presents the baro-corrected altitude
on a digital readout at the top center of
the instrument dial, and a pointer displays the
precise altitude on the dial markings. A
barometric-setting knob is on the lower-left
corner of the altimeter. The setting appears in
a digital readout as hectoPascals (MB) on the
lower-left face and inches of mercury (INHG)
on the lower-right face of the instrument dial.
Green and red LEDs on the upper left corner
of the bezel provide self-test indications during
power-up.
WARNING
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Figure 16-50. Standby Airspeed Indicator
NOTE
When power is applied to the standby
altimeter, the green and red LEDs
flash. The standby altimeter needle
moves to the zero park position and
then returns to the measured pressure
once normal operation of the instrument
begins.
When the power-up self-test is complete, verify
the green LED illuminates, and the indicator
needle reads the current altimeter
barometric setting. If the red LED illuminates,
the instrument is not operational, and maintenance
is required.
The instrument pointer may be tested by pushing
the BIT switch on the lower right bezel.
STANDBY MAGNETIC
COMPASS
The standby magnetic compass is on the
windshield post above the assist handle
(Figure 16-52). It uses a standard magnetic
compass wheel inside a kerosene-filled
chamber, viewed through a window in the
front of the instrument. The compass has a
calibration placard on the windshield post.
Aircraft heading appears in the window under
the lubber line in the center of the window.
Avoid placing metal or magnetic objects
near the compass, because these
can cause errors.
NOTE
Magnetic compass is influenced by
the windshield heat, cockpit fan, and
fresh air fan. These items must be off
prior to referencing magnetic compass
heading, then may be reselected
on. The items must then be reselected
off prior to each referencing
of the magnetic compass.
CAUTION
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Figure 16-51. Standby Altimeter Figure 16-52. Magnetic Compass
CHAPTER 17
MISCELLANEOUS SYSTEMS
CONTENTS
Page
INTRODUCTION................................................................................................................. 17-1
GENERAL ............................................................................................................................ 17-1
OXYGEN SYSTEM ............................................................................................................. 17-3
Description.................................................................................................................... 17-3
Components ................................................................................................................... 17-3
Controls and Indications................................................................................................ 17-5
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