What was found
(CAN) RT AILERON OUTBOARD ATTACH DISCONNECTED IN FLIGHT DUE TO IMPROPER INSTALLATION. ON INSPECTION PICK UP POINTS FOR AILERON ATTACH HAD BEEN MISSED INTERNALLY DUE TO DIFFICULTY IN VISUAL ALIGNMENT IN BETWEEN SKINS WHERE ATTACH HARDWARE PURCHASE AILERON ATTACH HINGE. CHECKING PREVIOUS LOG BOOK ENTRIES, THE AILERON HAD NOT BEEN REMOVED SINCE 1990. AN ISSUE IS THE PRESSURE OF THE OVERLAPPING SKIN IS ENOUGH TO SIMULATE THE OUTBOARD ATTACH HINGE INSTALLED CORRECTLY. (TC# 20110503006)