Geared Reciprocating Engines - Honeywell Vibrex 2000 User Manual

4.5.8
To determine the engine revolutions per minute (RPM) from the
photocell, check the engine data plate and apply the resulting
ratio to the tachometer reading from the propeller.
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Geared Reciprocating Engines

NOTE: The propeller tachometer signal from the
photocell does not match the engine tachometer RPM.
Chapter 4 – Installation
13841 Rev A
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