"Paul Sengupta" writes:

Don't think I can use Gamis here in the UK.

In Canada, I think, U.S. approvals (STC, TSO, etc.) are acceptable for
U.S.-certificated planes. Is that not the case in the U.K.?

Uneven fuel distribution is the only reason I can think of that you
would get the shudder during leaning. In an ideal engine with perfect
fuel distribution, as you lean, the engine would simply produce more
power, then less power, then quietly shut off. The shuddering is from
different cylinders being at different parts of that progression
instead of all in sync.


All the best,


David