In 2008, I performed an eddy current inspection that would solidify my belief in proper technique and was an experience I will always remember. During a phase 49 on a Citation 560, I was performing a skin seam inspection on the belly of the aircraft at the aft pressure bulkhead. After receiving an indication on the eddy current machine, I investigated the situation that ultimately revealed an 18-inch crack in the stringer at the bulkhead between the wings.
We determined that the crack was caused by corrosion from the blue water in the lav being trapped in the belly of the airplane. This ultimately caused corrosion that led to a crack, which extended under pressure. In my 20-year career in aviation, I have never seen a situation so imminent. Without immediate attention, the best-case scenario would be the skin separating at the belly causing a sudden loss in pressure. A worst-case scenario could have seen the tail being separated from the aircraft.
As an NDT Level III, it is our job to not only keep aircraft owners and passengers safe, but to train and develop those around us. It is critical that we do not take anything for granted. While a simple reading on an eddy current machine might reveal a scratch that is easy to repair, it may be more. With proper mentoring and a lot of hands-on experience, technicians can fully understand what indications require further investigation.
Brian McKenzie started with Elliott Aviation in 2007 as a Quality Control Inspector and led the development of Elliott Aviation’s Accessory Shop in 2011. He received his A&P in 2004, IA in 2009 and ASNT NDT Level III in 2010. Brian started his career in the US Navy where he was part of the fixed wing and rotor wing maintenance and aircrew. He has maintained airframes and components on a diverse number of aircraft including Beechcraft products, Gulfstreams, Citations, Falcons and helicopters. Brian has also worked for Aero Air, Evergreen International, Flightcraft and Jet Services Inc.
