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T-34C INSTRUMENTS
CHAPTER ONE
Figure 1­7 Turn Indicator & Balance Ball
105.
FUNCTIONAL SCAN ITEMS
Functional scan items consist of engine instruments, gear and flap indicators, radios, navigation
equipment, fuel and oxygen gauges, magnetic compass, and/or any other item that requires
attention during flight. Because of its significance in the event of an RMI failure, the magnetic
(wet) compass is described.
1.
Magnetic Compass
a.
The magnetic compass (Figure 1­8) is an instrument containing a north­seeking
element, which, within its limitations of error, indicates the magnetic heading of the
aircraft. The instrument consists of a pair of parallel magnetic bars around which is
mounted a calibrated compass card. The bars align themselves with the magnetic
lines of force around the earth, and heading is read off the card under a fixed
reference called a "lubberline." Refer to NATOPS for additional information.
b.
Use and Limitations. This instrument has a pronounced turning and pitching error
during any change of attitude. These errors appear as tendencies for the compass card
to "lag" or "lead" the aircraft heading during the turn and to swing unpredictably in
turbulent air. Only when the airplane is in straight and level, balanced flight in
INTRODUCTION TO BASIC INSTRUMENTS 1-11


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