Questions on some units (EICAS)

[coa787]

Does anyone know the units for
1. Oil pressure?

2. Oil quantity?

3. Engine vibration?

Thanks

[Minuteman]

The units ... yes ... uh, white, yellow, and red?

[BobDDuck]

Oil Pressure is in PSI.

Oil Quantity is a percentage of the total (in the CRJ, and it is only visible on EICAS in the 700 and 900).

Engine Vibration is measured as a number based off of a sensor and has a max allowable amount. I don't know if there is actual "measurement" but I'd guess if there was it would be in millimeters of displacement.

[Clocks]

Originally Posted by coa787

Does anyone know the units for
1. Oil pressure?

2. Oil quantity?

3. Engine vibration?

Thanks

1. PSI
2. In the ERJ it's quarts and on the MFD T/O page
3. There is a limitation that is in IPS (inches per second), but I was told during training the colored bands on the EICAS don't directly correlate to that limitation, so in other words different parts of the green band have meaning but nothing we can use.

[Minuteman]

Originally Posted by BobDDuck

Engine Vibration is measured as a number based off of a sensor and has a max allowable amount. I don't know if there is actual "measurement" but I'd guess if there was it would be in millimeters of displacement.

Originally Posted by Clocks

...but I was told during training the colored bands on the EICAS don't directly correlate to that limitation, so in other words different parts of the green band have meaning but nothing we can use.

Almost universally in interface control documents for electronic displays, the units for engine vibration is ... 'units'!

I would bet it is some kind of representation of the magnitude of vibration across a range of frequencies, normalized to a number that goes from 0-4 (or 5? ... a "power spectrum weighted integral"?) ... some number cooked-up by the AVM/EVM/EIVMU, which has a gaggle of accelerometers on each of the rotors, all boiled down to a "x.x" number for for the worst-offending component or a "broad band" average.

[coa787]

Is the oil quantity measured in quarts for most aircraft such as those manufactured by Boeing and Airbus?

...And what would be the limit for engine vibration on the 767?

[Polar742]

Originally Posted by coa787

Is the oil quantity measured in quarts for most aircraft such as those manufactured by Boeing and Airbus?

...And what would be the limit for engine vibration on the 767?

Embraers are in Quarts, 747s in gallons