Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 986 / 1956

PAGE 40
Feb 28/07
5E20
34-20-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
9. Turn Coordinator
Unlike the conventional turn and slip indicator, the electrically operated gyroscope in the turn coordinator
is canted. However, like conventional turn and slip indicator, it works on the principal of precession. By
canting the gyro, the instrument not only measures rate of turn, but also measures rate of roll. With this
indicator, if the aircraft is rolled right and left rapidly, the indicator will move, measuring the rate at which
the airplane is rolled by indicating a turn in the direction of the roll. If the aircraft is held in a bank, and
rudder is applied (such as when slipping), the needle indicator will come back to neutral, indicating no
turn.The slip/skid portion of the indicator is a ball sealed in a curved glass tube filled with damping fluid.
In the previous example, It would indicate the airplane is slipping. By utilizing rudder and aileron to
establish the airplane in a desired rate of turn will eventually establish the airplane in a coordinated turn
at the desired rate.
A. Troubleshooting
See Chart 14.
B. Removal and Installation
See 39-10-00, Face Mounted Instruments - Removal and Installation.
CHART 14
TROUBLESHOOTING TURN COORDINATOR
Trouble Cause Remedy
Instrument fails to respond Foreign matter lodged in Replace instrument.
when power is being applied instrument.
to instrument.
Incorrect sensitivity. Out of calibration. Replace instrument.
Incorrect turn rate. Out of calibration. Replace instrument.
Ball sticky. Flat spot on ball. Replace instrument.
Ball not in center when aircraft Instrument not level in panel. Level instrument.
is correctly trimmed in wings
level flight.
Instrument will not run. No power to instrument. Check appropriate circuit
breaker on pilot's circuit
breaker panel.
Check circuit and repair.
Instrument malfunction. Replace instrument.