TURN AND BANK INDICATOR.
The turn and bank indicator can be either vacuum driven or electric. The turn portion of the indicator is a
gyroscope, while the bank portion of the indicator is a ball sealed in a curved glass tube filled with damping
fluid. There are two styles of this unit. The first is the old style with a vertical needle in the center of the dial.
This instrument reads only the rate of turn, and unless the aircraft is turning, the needle will not move
regardless of bank angle. The other style is the turn coordinator which indicates both the rate of turn and rate
of roll. With this indicator, if the aircraft is rolled right and left rapidly, the indicator will move, indicating a
turn, but if the aircraft is held in a bank, and rudder is applied, the indicator will come back to zero indicating
no turn.
CHART 3407. TROUBLESHOOTING (TURN AND BANK INDICATOR)
Trouble Cause Remedy
Pointer fails to respond. Foreign matter lodged in Replace instrument.
instrument.
Incorrect sensitivity. Out of calibration. Replace instrument.
Incorrect turn rate (vacuum High or low vacuum. Check vacuum and adjust.
style).
Filter dirty. Replace filter.
Incorrect turn rate Out of calibration. Replace instrument.
(electric).
Aircraft not in coordinated Center ball in turn.
turn.
Ball sticky. Flat spot on ball. Replace instrument.
Ball not in center when air- Instrument not level in Level instrument.
craft is correctly trimmed. panel.
Instrument will not run No power to instrument. Check circuit and repair.
(electric).
Instrument malfunction. Replace instrument.
—END—
34-10-08
Page 34-12
December 1, 1978
2G20
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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