Meister808 From United States of America, joined Jan 2000, 973 posts, RR: 1 Posted (9 years 6 months 5 days 13 hours ago) and read 2413 times:
Turns out that the upper deck on some classics has been having trouble. Not really a deal, but thought y'all might find it interesting, especially considering the fact that the AD was issued yesterday:
Dl757Md From United States of America, joined May 2004, 1562 posts, RR: 16
Reply 1, posted (9 years 6 months 5 days 12 hours ago) and read 2333 times:
Quoting Meister808 (reply 0): It is interesting, however, that they want this inspected once every 25 cycles. Thats pretty often.
Not really. 25 cycles on a 747 can be more than 200 hrs. Not a lot when you consider 100 hr inspection on GA aircraft. Also the repetitive inspections (25 cycle) are no longer needed after an HFEC(High Frequency Eddy Current) inspection. The reason for the high frequency of the visual inspetions is that your are looking for EXTERNAL signs of already existing INTERNAL damage. This damage may take hundreds or thousands of hours to show up externally. The HFEC is a non-destructive test that show all internal damage and a successful HFEC inspection insures that there is no damage at all, external or internal.
If the operator has their own equipment and personnel it shouldn't be too bad. If they have to contract it out then it could get expensive. I have no idea how long it would take as I'm not sure of the size of the area or the exact requirements for the inspection.