Originally Posted by
Finessed
Is the Max fuel imbalance in flight on the 145 around 800 pounds? The fuel imbalance on the ERJ175 is 794 pounds, it was mentioned that the 175 doesn’t actually have a fuel imbalance issue, it can literally fly with fuel only in one wing.
When Embraer went for approval it was noticed that they did I not have a limitation for fuel imbalance on the 175, they were told they needed one for approval.
So naturally they used the 145 max fuel imbalance.
I absolutely believe that this was said in GS, but unless I hear it directly from the FAA Cert team, no one will be able to convince me it’s true.
That said, I believe that for certification they need to demonstrate (whether it’s flight or theoretical data)a single engine approach to a landing and a go-around with a moderate xwind with that imbalance plus a safety buffer.
There may be a cutoff ratio where they will accept only theoretical or simulated data. I’m guessing OEMs don’t put any effort into increasing that number since it’s not a performance number customers would care about. That last part is a WAG on my part.