Navigation — Radio Altimeter Antenna Installation — Modification
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of BAe ATP aeroplanes must complete the specified modification within 12 months from the effective date of 3 May 2023. The modification must be performed in accordance with the instructions in BAE Systems Service Bulletin ATP-53-053. Alternative methods of compliance may be approved by the CAA if properly substantiated.
Summary
Civil Aviation Authority Airworthiness Directive G-2023-0002 addresses the installation and modification of radio altimeter antennas on BAe ATP aeroplanes. This directive applies to all manufacturer serial numbers of BAe ATP aircraft and mandates a modification to improve electrical bonding between the radio altimeter antennas and the fuselage. The directive aims to prevent false radio altimeter indications that could lead to incorrect Terrain Awareness and Warning System (TAWS) callouts.
What changed
This new Airworthiness Directive introduces a required modification involving the replacement of bare metal packers with a conductive gel gasket between the radio altimeter antennas and the fuselage skin reinforcing plates. The modification is detailed in BAE Systems Service Bulletin ATP-53-053 and is intended to address corrosion-related electrical bonding issues that cause false TAWS alerts.
Why it matters
This directive is critical for aviation professionals because poor electrical bonding can lead to false radio altimeter readings, potentially causing flight crews to misinterpret genuine TAWS warnings, especially during high workload phases such as approaches in poor visibility. Ensuring compliance enhances flight safety by reducing the risk of inappropriate crew responses to false alerts and maintaining the continuing airworthiness of affected aircraft.
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