As an owner of a C-310, I have been following this issue over the past
year. The current NPRM Compliance Requirements call for inspection of
certain 400 series wing spars at given flight hour thresholds:

401 series and 402, 402A, 402B = 6,500 hours
411 series = 5,500 hours
402C = 14,500 hours
414A through S/N 200 = 8,500 hours
414A S/N 201+ = 14,500 hours

Any idea of the current status of this AD thing? Are the numbers above
set, or is it still being discussed?

John Szpara
Affordable Satellite
Fiero Owner 2-84 Indy Pace cars, 86 Coupe, 88 Formula 3.4, 88 Coupe, 88GT