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,
correct?
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
Thank you for the explanation, appreciated.
Hope someone some day has time to get SL 439 compliance approved as an AMOC. It's irritating to sign
this off every year, and must be also for the factory to sign off an AD in each new log book.
Bill, you are correct in questioning how an AD can apply to aircraft that have not been built yet. Over the years both the FAA and manufactures have been trying to better address how instructions for continued airworthiness are handled. This leaves a lot of older ADs left poorly worded with owners and mechanics wondering exactly what needs to be accomplished. Changing the AD is "rule making" and an involved process for the FAA that may not be worth the effort. What we have done for other ADs is request an AMOC with terminating action (see the AMOC for SL 441 in example). This lets the ongoing inspections be required per the AMOC rather than the original AD. In the mean time you are stuck complying with the AD and SL 439.