Wings - Rib 3 / Wing Skin Interface Rivets - Sealant Application
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Embraer EMB-135BJ airplanes must apply sealant on the rivets at the rib 3 and wing skin interface following Embraer Service Bulletin SB145LEG-57-0015 within 48 months from the effective date of March 6, 2023. Maintenance teams should document compliance in the aircraft maintenance logbooks. Any alternative compliance methods require prior approval from ANAC's Continuing Airworthiness Technical Branch.
Summary
Brazilian Airworthiness Directive AD No. 2023-03-01 issued by the Agência Nacional de Aviação Civil (ANAC) mandates sealant application on rivets at the rib 3 and wing skin interface for Embraer S.A. EMB-135BJ airplanes. This directive applies to all EMB-135BJ aircraft as identified in Embraer Service Bulletin SB145LEG-57-0015. The directive aims to enhance safety by addressing a potential ignition risk inside the fuel tank.
What changed
This new Brazilian Airworthiness Directive introduces a mandatory corrective action requiring the application of sealant on rivets at the interface between rib 3 and the wing skin on EMB-135BJ airplanes. It addresses the previously identified absence of sealant which could lead to ignition sources during lightning strikes. The directive also establishes provisions for alternative methods of compliance subject to ANAC approval.
Why it matters
This directive is critical for aviation professionals because it mitigates the risk of fuel tank explosions caused by potential ignition sources during lightning strikes. Operators and maintenance organizations must ensure compliance to maintain aircraft airworthiness and safety. Failure to comply could result in unsafe operating conditions and regulatory penalties.
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