Landing Gear — Braking and Steering Control Unit — Replacement / Master Minimum Equipment List — Amendment; Electric and Electronic Common Installation — Relays — Replacement
- Published
- Effective
- Deadline
- Replaces
- 2022-0032R1
- Replaces
- 2023-0093
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must inspect relays at FIN positions 24GG and 25GG within 12 to 24 months depending on BSCU type and aircraft group. If a BSCU fault signature occurs, affected units must be replaced before the next flight. Type 1 relays must be replaced with type 2 relays within 12 to 24 months, and installation of relay P/N E0244-28A0 at specified positions is prohibited after modification or from the effective date for certain groups. The MMEL must be updated and flight crews informed accordingly.
Summary
EASA Airworthiness Directive 2023-0093R1 is an amendment addressing the replacement and inspection of Braking and Steering Control Units (BSCU) and relays on Airbus A319, A320, and A321 aeroplanes. It applies to specific models and serial numbers, focusing on BSCUs with part number E21327307 and relays installed at FIN positions 24GG and 25GG. The directive aims to ensure continued airworthiness by mitigating risks related to braking and steering control failures.
What changed
This revision updates the original AD 2023-0093 by including aeroplanes delivered with BSCU part number E21327107 in the inspection and replacement requirements. It mandates inspections to identify relay types installed, replacement of affected BSCUs upon fault detection, and replacement of type 1 relays with type 2 relays within specified compliance times. Additionally, it updates the Master Minimum Equipment List (MMEL) and imposes installation restrictions on certain relay part numbers.
Why it matters
The directive addresses critical safety concerns related to BSCU channel failures that can lead to loss of anti-skid braking and nose wheel steering, increasing the risk of runway excursions. For operators and maintenance organizations, compliance ensures aircraft braking and steering systems function reliably, maintaining safe operation and regulatory conformity. The AD also provides updated operational procedures and maintenance requirements to manage identified faults effectively.
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