We've been made aware of a "Critical Service Bulletin" from Continental Motors and the FAA that applies to the engine in our Bonanza.
The $0.05 version: There have been big bore Continental engine failures that have correlated to having been run under 2300 rpm cruise for extended periods. So, for the safety of you and our engine, please do not run the Bonanza at less than 2300 rpm in cruise flight. Read the attached bulletin for details.
There was a discussion at the club meeting yesterday about a "Fuel Qty Mismatch" warning that came up on the EDM900 engine monitor in 9RN. Some, dare I say, boisterous conversation ensued about what exactly we are being warned about when that pops up, and why it happens. Since some members seem to have a curiosity regarding how much fuel is contained in the airplane around them, I did some digging.
A little research and a call to JPI came up with the following info:
"Fuel Qty Mismatch" occurs when the measured fuel quantity in the tanks ("FUEL QTY GAL" display in 9RN and "FUEL QTY" in 26Y) is different from the calculated fuel remaining as displayed by the EDM ("REM" in 9RN and "Est REM" in 26Y). If these differ by more than 10%, it should trigger the warning.
The calculated fuel remaining is derived from the "REFUEL?" gallons number entered…
Thanks, Scott!
Anyone aspiring to be our heroic test pilot could experiment by inputting an exaggerated (very high or very low) fuel flow value at preflight, then see if you hit that 10% disagreement very quickly. That should tell us if the calculation is based on the "dumb" constant flow that we enter or a "smart" value coming from actual fuel passing thru the transducer. ...if I understand it correctly, that is.
Can anyone remind me (and save me from digging up the answer) how to update FOB in the EDM if you messed it up when first powering up?
F = 2C + 30
Even a pilot could understand this! 😎
Besides the calculations, there are a few that are particularly easy:
28C-82F
15C-59F (we should all know this one)
0C-32F
35C-95F
And Stuart’s favorite: -40C equals -40F
Thanks for posting Scott!