AD 2017-04-04
Unsafe Condition
Cracking and surface anomalies (bulges and/or dents) of the fuselage skin at the water trap/air drier unit of the forward discharge valve, located between fuselage frame (FR) 22 and FR23 and between stringers 22 and 23, due to corrosion beneath the water trap/air drier unit.
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Required Actions
Conduct a one-time inspection to identify if water trap/air driers are installed. Perform repetitive detailed visual inspections (DVI) of the fuselage skin adjacent to the front and rear discharge valves to check for bulging, surface anomalies, and cracking. Accomplish applicable corrective actions and apply additional sealant in the affected area if necessary.
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Compliance Time
Within 50 flight hours after the effective date of this AD.
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Affected Aircraft
BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ series airplanes, including those with auto-pressurization modification No. HCM50259A incorporated during production.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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