AD 2020-04-11
Effective 04/13/2020 · Published 03/09/2020
Airworthiness Directives; The Boeing Company Airplanes
Summary
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-400 series airplanes. This AD was prompted by a report of a certain modification that causes interference with inspections that are intended to detect fatigue cracks. This AD requires repetitive low frequency eddy current (LFEC) inspections of a certain fuselage upper skin lap splice for cracks, repetitive high frequency…