B737-400/-NG Engine Vibration Indication
Okay - I'd like to know what what you know about the unit of measure that is displayed on the VIB indicator for the 737-400/-NG. I know that the range for the indicator on the -400 is a value between 0 and 5 and the -700 displays the data in a digital format. I also know the data originates at two sensors (accelerometers) - one on the forward end of the engine and one at the fan frame. The signal goes to the AVM signal conditioner in the E&E bay and is then displayed appropriately in the flight deck as a 'number'. I know that the 'number' represents how much vibration the engine is encountering, some being acceptable, too much being cause for concern and eventually in-flight shut down. What I want to know is - what is the unit of measure displayed on the VIB indicator? This is unclear from the data I have to review. <img border="0" title="" alt="[Roll Eyes]" src="rolleyes.gif" /> Thanks...