AD 75-17-16 states in paragraph C).
"At each annual, progressive, or 100-hour inspection as required by Federal Aviation Regulation 91.169, on Models covered by paragraphs A and B and all subsequent serials of those same models, inspect the alternate air valve for cracks."
NOTICE it says "and all subsequent serials of those same models"
So it applies to my 8KCAB 190-75 even though I installed a new complete airbox in 2002,
AND it applies to all new and future 8KCAB aircraft, correct?
SL 439 explains the inspection, but I don't understand how an AD can apply to aircraft that are not even built yet. And apply to aircraft that have replaced the airbox or complied with SL439.
Thanks, Bill B