AD 99-22-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE Systems (Operations) Limited | Avro 146-RJ100A | Airworthiness Directives; British Aerospace Model BAe 146 and Avro 146-RJ Series Airplanes |
| aircraft | BAE Systems (Operations) Limited | Avro 146-RJ70A | Airworthiness Directives; British Aerospace Model BAe 146 and Avro 146-RJ Series Airplanes |
| aircraft | BAE Systems (Operations) Limited | Avro 146-RJ85A | Airworthiness Directives; British Aerospace Model BAe 146 and Avro 146-RJ Series Airplanes |
| aircraft | BAE Systems (Operations) Limited | BAe 146-100A | Airworthiness Directives; British Aerospace Model BAe 146 and Avro 146-RJ Series Airplanes |
| aircraft | BAE Systems (Operations) Limited | BAe 146-200A | Airworthiness Directives; British Aerospace Model BAe 146 and Avro 146-RJ Series Airplanes |
| aircraft | BAE Systems (Operations) Limited | BAe 146-300A | Airworthiness Directives; British Aerospace Model BAe 146 and Avro 146-RJ Series Airplanes |
Unsafe Condition
Failure of the roller sub-assemblies in both the main landing gear (MLG) door lock and the MLG uplock, which could result in failure of the MLG to retract and lock after takeoff, or to deploy properly for landing.
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Required Actions
Install a modified roller sub-assembly in the MLG door lock unit and the MLG uplock unit per British Aerospace Modification HCM70656A or HCM70656B. Prohibit installation of MLG door lock assemblies with part numbers 200898001/200898002 and MLG uplock assemblies with part numbers 200885001/200885002.
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Compliance Time
Varies based on total flight cycles as of 12/02/1999: 6, 12, or 18 months after effective date, or within 18 months after reaching 22,000 cycles if fewer.
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Affected Aircraft
British Aerospace Model BAe 146 and Avro 146-RJ series airplanes (Avro 146-RJ100A, Avro 146-RJ70A, Avro 146-RJ85A, BAe 146-100A, BAe 146-200A, BAe 146-300A)
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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