TM 55-1520-240-23-7
8-1
ENGINE INSTRUMENTS
(Continued)
8-1
GAS PRODUCER TACHOMETER SYSTEM WITH 74
Description
The gas producer tachometer indicating (N1) system
measures engine compressor rpm. There is a separate
system for each engine. Each system consists of an
indicator and a magnetic (speed) pickup. The magnetic
pickup is mounted on the engine. The indicator is
mounted on the center instrument panel.
NO BREAK - WORK HARDER
The gas producer tachometer (N1) indicator shows
compressor rpm as a percentage of maximum rated
speed. The indicator is calibrated 0 to 110 percent rpm.
Electrical connections are made through a connector at
the rear of the instrument.
NO BREAK - WORK HARDER
The only powerplant-mounted equipment is a magnetic
pickup. The magnetic pickup gives a signal frequency
that is proportional to gas producer speed. Electrical
connections are made through a connector on the side
of the magnetic pickup.
8-5