TM 1-1510-224-10
2-82.
COPILOT'S BAROMETRIC ALTIMETER.
a.
Description. The copilot's barometric altimeter
(fig. 2-39), provides an indication of the aircraft's
pressure altitude above sea level.
b.
Controls, Indicators, and Functions.
(1)
Altitude
indicator
needle.
Used
in
conjunction with altitude scale to display aircraft altitude
in hundreds of feet.
(2)
Barometric
pressure
counter-drum
indicator (millibars). Indicates barometric pressure in
millibars that has been set by the barometric pressure
setting knob.
(3)
Barometric
pressure
counter-drum
indicator (Inches of mercury). Indicates barometric
pressure in inches of mercury that has been set by the
barometric pressure setting knob.
(4)
Barometric pressure setting knob. Used
to manually set barometric pressure displayed in the IN
HG and MB windows.
(5)
Counter-drum altitude display. Indicates
aircraft altitude in tens of thousands, thousands, and hun
dreds of feet above sea level.
(6)
Altitude scale. Used in conjunction with
altitude indicator needle to indicate aircraft altitude in
hundreds of feet. Subdivided into 20 foot increments.
NOTE
If the altimeter does not read within
70 feet of field elevation, when the
correct local barometric setting is
used, the altimeter needs calibration
or internal failure has occurred. An
error of greater than 70 feet also
nullifies use of the altimeter for IFR
flight.
2-83.
STANDBY ATTITUDE INDICATOR.
An air-driven standby attitude indicator is located on
the pilot's instrument panel (fig. 2-18).
a.
Standby Attitude Indicator Controls, Indicators,
and Functions (fig. 2-40).
(1)
Bank angle scale and pointer. The
moveable bank angle pointer indicates aircraft bank
angle by moving around a fixed bank angle scale.
(2)
Pitch angle scale. Aircraft pitch angle may
be read under the symbolic miniature aircraft on a
vertical pitch angle scale located on the attitude sphere.
1.
Altitude Indicator Needle
2.
Barometric Pressure Counter-Drum Indicator Window (Millibars)
3.
Barometric Pressure Counter-Drum Indicator Window (Inches of Mercury)
4.
Barometric Pressure Setting Knob
5.
Counter-Drum Altitude Display
6.
Altitude Scale
A93FE00D0095 C
Figure 2-39. Copilot's Barometric Altimeter
2-88
