"as far as I can tell from the requirements for EPR trimming it will happen on the ground as the lock-up occurs at 65 kts."
VnV2178B... By "as", I understand that you
don't mean "at the time" lock-up begins. Your statement might be read in a couple of ways
"2. The throttle trim works to trim EPRs or N1s against the value set on the second highest engine."
My training notes do mention this, but I wasn't sure if this also meant that the throttles would advance (in response to pushing the TOGA switch) until the second throttle lever reached target thrust.
"It is effective for a specific engine ONLY if its throttle knob is within half a knob's diameter of the remainder."
This is a key statement. I previously understood that all engines would stop trimming if any were outside the range.
By the way, by "half a knob's diameter", do you mean only a half knob stagger... or half a knob clear of the other throttles? The former would be very small indeed and would stress the need to line up the throttles properly before TOGA is pushed.
Anyway, thank you gentlemen... and, by the way, C.J., it's good to see you are still with us
Cheers.
Q.