RPM indicator found on each EICAS page.
The propeller RPM indicator uses a circular scale with a moving pointer and
a digital value indicating propeller revolutions per minute in increments of 10
RPM. The pointer moves through a range from 0 to 2300 RPM with an amber
range from 450 to 1050 RPM, a green arc from 1900 to 2200 RPM, and a
red radial line at 2200 RPM. When propeller RPM reaches the red line limit,
the pointer, digital value, and label (NP RPM) turn red to show propeller RPM
is more than the limit. The digital value and label (NP RPM) will ash. The
amber range represents the propeller operating limitation prohibiting stabilized
ground operation between 450 and 1050 RPM.
The instrument is electrically operated from the propeller tachometer-
generator which is mounted on the right side of the propeller reduction
gearbox. The propeller RPM indicator is displayed in the same conguration
and location on the default SYSTEM and ENGINE pages.
The indicator operates in conjunction with a speed sensor and transmitter
located on the right side of the propeller reduction gearbox. The speed
sensor provides a signal to the GEA 71 Engine and Airframe Interface Unit
which processes and outputs propeller RPM data to the EICAS. A red X
through the
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