Fuselage - Lower Lobe Electronic Equipment Bay Sealant - Inspection
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators must perform detailed inspections and required replacements or repairs as specified in Boeing Alert Requirements Bulletin 737-53A1401 RB dated April 27, 2021. All actions must be completed by May 27, 2022, the effective date of this directive. Operators should consult the referenced service bulletin for detailed procedures and comply with all on-condition actions if sealant deficiencies are detected.
Summary
Federal Register Volume 87, Number 78 (April 22, 2022) Final Rule Airworthiness Directive addresses certain Boeing 737-800 series airplanes. The directive mandates inspections and corrective actions for sealant in the lower lobe electronic equipment bay to prevent water ingress that could damage critical flight systems.
What changed
This new airworthiness directive introduces mandatory detailed inspections of sealant condition in specific areas of the lower lobe electronic equipment bay, replacement of moisture barrier tape and weather seals, and installation of seat track fillers. It also requires on-condition repairs if sealant deficiencies are found. The directive confirms that winglet STC ST00830SE installation does not affect compliance.
Why it matters
This directive is critical for operators and maintenance organizations to prevent water damage to electronic equipment such as air data inertial reference units and flight management computers. Failure to comply could result in loss of primary flight display data and electronic navigation functions, jeopardizing safe flight and landing. Compliance ensures continued airworthiness and operational safety of affected Boeing 737-800 aircraft.
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