B744 Engine Fail EICAS

[OneTwoTree]

Good day everyone,

Just a quick question regarding the 744.

What parameters trigger the ENG 1,2,3,4 FAIL message to show up?

I am assuming the EEC's compare the EPR, N1, N2 and others and then determine that one engine is toast when they drop beyond a certain point.
Any idea what these figures are?

Thanks for your input!

OneTwoTree

[TopSwiss 737]

Standing by to be corrected, but this is what my FCOM 2 (General Electric CF6-80) says... Might be different for different engines.

It does not directly give the exact trigger parameters as such, but a bit of reading gives the following:

ENG 1, 2, 3, 4 FAIL
Condition: One of these occurs:
•An engine failure
•An engine flameout


The explanation of the auto-relight feature says the following:

"A flameout is detected when a rapid decrease in N2 occurs, or N2 is less
than idle RPM."

By the way, the ENG 1, 2, 3, 4 FAIL EICAS Caution and it's associated beeper are inhibited on the ground, until lift-off occurs.

[SMOC]

For the Roller on the 744

ENG FAIL _

N3 less than 50%,
Oil Pressure less than 25 psi,
Fuel Control Switch ON.
GCB is open,
and Airplane in Air Mode.

[737Jock]

What parameters trigger the ENG 1,2,3,4 FAIL message to show up?

Volcanic ash clouds!!!;) (>4mg volcanic ash per cubic meter)

Volcanic ash and aviation safety - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Volcanic_ash_and_aviation_safety)