The clouds rolled in to SoCal last week so I wanted to go fly some
approaches, but I had fallen out of currency the week before so I
couldn't go. It occurred to me that one can easily get into a situation
where you can have quite a bit of recent IFR experience but still not be
current. The most extreme case is something like this: I fly 6
approaches on Jan 31. On June 30 I fly five more. On July 1, despite
the fact that I've flown five approaches the day before, and eleven in
the previous 180 days, I am not current.

On the other hand, if I'd flown the original six approaches on Feb 1
instead of Jan 31, I'd be current through July 31 whether or not I flew
any additional approaches in the intervening time.

A better way to measure currency would be to have every approach you fly
make you current for 30 additional days up to a maximum accrued currency
of 180 days. This wold have the same net effect as the current rules,
but with less of the perverse non-linearities.

I am accepting bets that this will happen at 100:1 against.

rg