Tachometer Generators - Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual

3.

Tachometer Generators

The propeller (Np) and gas generator (Ng) tachometer-generators produce an electric current which is
proportional to gas generator and propeller speed. The electric current is monitored and the tach speeds
are displayed by the Meggitt Engine Instrument Display System (EIDS);
installed in S/N's 4697198, 4697216 and
backside of the accessory gearbox and rotates counterclockwise. The propeller tachometer generator is
mounted on the right side of the reduction gearbox case and rotates clockwise.
A. Removal
(1) Disconnect the electrical connector from the tachometer generator unit.
(2) Remove the four mounting nuts at the base of the tachometer generator.
CAUTION: IMMEDIATELY AFTER REMOVING EACH TACHOMETER GENERATOR UNIT,
(3) Pull the unit straight out and away from the mounting lugs.
B. Installation
(1) To install the tachometer generator unit, place a new gasket on the mounting pad.
(2) Lubricate the tachometer generator unit shaft splines with Molybdenum Disulfide, Type G,
paste form lubricant (MIL-G-21164).
(3) With the electrical socket pointing down, slide the tachometer generator into place over the
mounting studs.
(4) Secure the unit in place with the four mounting nuts and torque to 65 to 85 inch-pounds.
77-10-00
PAGE 10
Apr 15/07
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
up. The gas generator tachometer generator is mounted on the
COVER THE TACH GENERATOR MOUNTING PAD TO PREVENT FOREIGN
MATERIAL FROM ENTERING THE ENGINE.
or the Avidyne MFD when
7I22