AD 98-21-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE Systems (Operations) Limited | Avro 146-RJ100A | Airworthiness Directives; British Aerospace Model Avro 146-RJ85A and RJ100A Series Airplanes |
| aircraft | BAE Systems (Operations) Limited | Avro 146-RJ85A | Airworthiness Directives; British Aerospace Model Avro 146-RJ85A and RJ100A Series Airplanes |
Unsafe Condition
Reduced wing strength and stiffness, and the onset of premature fatigue cracking due to machining (undercutting) into the web of the integral stringers of the bottom skin of the wings, which could result in reduced structural integrity of the airplane.
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Required Actions
Perform a one-time detailed visual inspection for evidence of machining into the web of the integral stringers of the bottom skin of the wings in accordance with British Aerospace Service Bulletin SB.57-55. If machining is detected and web thickness is less than 0.099 inch, repair prior to further flight using an approved method.
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Compliance Time
Within 6 months after the effective date of this AD
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Affected Aircraft
British Aerospace Model Avro 146-RJ85A and RJ100A series airplanes, as listed in British Aerospace Service Bulletin SB.57-55, dated April 27, 1998.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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