Wed, Apr 19, 2017
Changing Procedures For Detecting Corrosion In Aft Fuselage Structure
The FAA has issued a Special Airworthiness Information Bulletin (SAIB) concerning procedural changes for detecting corrosion damage to the aft fuselage structure in the area of the vacuum waste tanks on Boeing 737, 747, 757, 767 and 777 airplanes.
The FAA has received numerous reports of corrosion damage to the aft fuselage structure in the area of the vacuum waste tanks on Model 777 airplanes. This corrosion has been attributed to insufficient clean up and neutralization of leakage and spillage from the vacuum waste system. These reports document that an initial finding of corrosion damage is often followed within the year by corrosion found in close proximity.
The waste material from a vacuum waste system spill or leak is acidic and corrosive to the airplane structure, such as skin, stringers, and frames. The waste material erodes the corrosion inhibiting compound and the protective finishes, which causes areas of bare structure that are more susceptible to corrosion.
While the reports of corrosion have been limited to Model 777 airplanes, Boeing believes the Model 737, 747, 757, and 767 airplanes are subject to the same issue. To minimize and address this corrosion, Boeing is revising the related aircraft maintenance manuals (AMMs) and structural repair manuals (SRMs), as listed in Table 1 of this SAIB. The revisions include adding procedures for neutralizing vacuum waste; defining the correct procedures for containing, cleaning, and neutralizing vacuum waste; and adding procedures for the inspection for and removal of corrosion, and re-application of protective coatings.
The FAA recommends that all owners and operators of the affected airplanes incorporate the revised AMM and SRM procedures when they become available.
(Source: FAA)
More News
Runway Lead-in Light System Runway Lead-in Light System Consists of one or more series of flashing lights installed at or near ground level that provides positive visual guidance a>[...]
Aero Linx: Aviation Without Borders Aviation Without Borders uses its aviation expertise, contacts and partnerships to enable support for children and their families – at hom>[...]
Dave Juwel's Aviation Marketing Stories ITBOA BNITBOB ... what does that mean? It's not gibberish, it's a lengthy acronym for "In The Business Of Aviation ... But Not In The Busine>[...]
From 2010 (YouTube Version): Yeah.... This IS A Really Cool Job When ANN's Nathan Cremisino took over the lead of our Aero-TV teams, he knew he was in for some extra work and a lot>[...]
Also: Junkers A50 Heritage, Montaer Grows, Dynon-Advance Flight Systems, Vans' Latest Officially, the Carbon Cub UL and Rotax 916 iS is now in its 'market survey development phase'>[...]