Glueball,
I said the same thing in the next sentence:
"I did see lots of 747 classics last year, so maybe I am wrong."
Here is what I had read, it doesn't totally apply, It just means inspections for aircraft over 20 years of age.
"4.a.2 All aircraft older than 20 years prior to its flight permit application date, considered an aging aircraft.... GACA shall physically inspect these aircraft."
http://www.gaca.gov.sa/GACA/Attachme...j_circular.pdf