10-69. ELECTRICAL INSTRUMENTS.
l0-70. TURN AND BANK INDICATOR.
10-71. GENERAL. The turn and bank indicator is an electrical instrument. The turn portion of the indicator
is driven by a permanent magnet DC governor controlled gyro motor. Damping action is provided by a
precision air dashpot. The indicator is designed to indicate the rate of turn and roll; which means 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, by applying rudder, the indicator will come back to zero indicating no turn. The bank portion of the
indicator is a ball sealed in a curved glass tube filled with damping fluid. In an improperly coordinated turn
the ball is forced from the center of the tube, thus indicating attitude error.
10-72. TROUBLESHOOTING.
TABLE X-XI. TURN AND BANK INDICATOR
10-73. REMOVAL AND REPLACEMENT. Refer to Paragraph 10-87 of this section.
10-74. FUEL QUANTITY INDICATOR. Refer to paragraph 9- 15 of Section IX.
10-75. GENERAL. The two fuel quantity gauges are mounted in the cluster on the instrument panel. These
instruments are calibrated in fractional divisions of zero, 5gal., 10 gal., 15 gal. and full. A transmitter unit is
installed in each fuel cell. This unit contains a resistance strip and removable control arm. The position of
this arm is controlled by a float in the fuel cell and this position is transmitted electrically to the indicator
gauge to show the amount of fuel in the cell.
Trouble
Cause
Remedy
Pointer fails to
Foreign matter lodged in
Replace instrument.
respond.
Instrument.
Incorrect sensitivity.
Out of calibration.
Replace instrument.
Incorrect turn rate
Out of calibration.
Replace instrument.
Aircraft not in
Center ball in turn.
coordinated turn.
Instrument will not
No power to instrument.
Check circuit and repair.
run.
Instrument malfunction.
Replace instrument.
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
I N S T R U M E N T
2C8
