AD 2023-02-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE | Systems (Operations) Limited | Airworthiness Directives; BAE Systems (Operations) Limited Airplanes |
Unsafe Condition
IRUs having outdated MagVar lookup tables, which could lead to inaccurate inertial reference system calculations, possibly resulting in increased risk of controlled flight into terrain, or collision with another airplane and injury to occupants.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Assess the accuracy of an affected IRU's MagVar data table when compared to the current World Magnetic Model (WMM) MagVar data tables, and corrective actions if the MagVar is greater than 2 degrees. The corrective actions include either updating an affected IRU's MagVar data tables, or operating an airplane only if the terrain awareness warning system (TAWS) and traffic collision avoidance system (TCAS) are installed and operative, and revising the operator's FAA-approved minimum equipment list (MEL) to prohibit dispatch unless both TAWS and TCAS are installed and operative.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
BAE Systems (Operations) Limited Model Avro 146-RJ70A, 146-RJ85A, and 146-RJ100A airplanes, certificated in any category, equipped with Honeywell inertial reference unit (IRU) part number (P/N) HG2001BC02 or P/N HG2001BC04.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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