Navigation – Traffic Collision Avoidance System – Modification
- Published
- Takes effect
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of the affected BAE AVRO 146-RJ85A aircraft must complete the detailed GPS antenna inspections within 2500 flight cycles or 12 months from 24 November 2026, whichever occurs first. They must report inspection results to STC Twenty One Limited and the relevant National Airworthiness Authority. Additionally, the approved maintenance program must be revised within 12 months to include the new inspection tasks. Any defects found must be corrected before the next flight following consultation with STC Twenty One Limited.
Summary
Civil Aviation Authority Airworthiness Directive G-2026-0006 addresses the installation and inspection requirements for the Traffic Collision Avoidance System (TCAS) provisions with GPS antenna wiring on specific BAE AVRO 146-RJ85A aircraft. This directive applies to a defined list of aircraft serial numbers and excludes those with STC UK.STC.00319. It mandates inspections and maintenance program updates to ensure continued airworthiness related to the TCAS installation.
What changed
This new Airworthiness Directive introduces mandatory detailed inspections of the GPS antenna installation associated with the TCAS system embodied under EASA STC EASA.A.S.02766. It requires operators to follow the instructions in STC Twenty One Limited's Service Bulletin S21.SB-0239 Issue 2 and update their approved maintenance programs accordingly. The directive also establishes reporting requirements for inspection findings and corrective actions if defects are found.
Why it matters
This directive is critical for aviation professionals because it addresses a potential unsafe condition caused by omitted detailed inspections after aircraft transfer between registers. Failure to perform these inspections could lead to unnoticed cracking or distress in the GPS antenna installation, compromising flight safety. Operators and maintenance organizations must comply to ensure regulatory adherence and maintain aircraft safety standards.
More for Bae Systems (Operations) AVRO146RJ
All 14- EASA AD G-2026-0005Time Limits / Maintenance Checks – Airworthiness Limitations Section - AmendmentSep 7, 2026
- EASA AD G-2025-0003Time Limits / Maintenance Checks — Airworthiness Limitations Section AmendmentMay 26, 2025
- EASA AD G-2024-0002Auto Flight — Category III Automatic Landing — Operational Limitation / Aircraft Flight Manual - Category III Automatic Landing — Operational LimitationJun 28, 2024
- EASA AD G-2023-0006Fuselage — Centre Fuselage Forward Rib 0 Longeron — InspectionNov 27, 2023
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