Exhaust – Thrust Reverser Lower Beam – Inspection / Repair
Superseded. Comply with 2022-0222, which replaces this document.
- Published
- Effective
- Deadline
- Replaces
- 2018-0148
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must perform initial and repetitive special detailed inspections (conductivity tests) of the left-hand and right-hand TRU beams within specified flight cycle or calendar limits, whichever occurs later. If damage exceeds specified limits, the TRU beam must be replaced before further flight. Detailed and ultrasonic inspections are required if initial inspections indicate potential issues. Installation of TRU beams is restricted to those within cycle and time limits or those that have passed inspections. Compliance deadlines include initial inspections before exceeding 3,300 flight cycles or 24 months since installation or by 27 July 2018, whichever is later.
Summary
EASA Airworthiness Directive 2018-0148R1 is an updated safety directive addressing Airbus A330-243, A330-243F, A330-341, A330-342, and A330-343 aeroplanes equipped with Trent 700 engines. It mandates inspections and repairs of the thrust reverser lower beam (TRU beam) due to thermal degradation and potential fatigue issues that could lead to disconnection of the thrust reverser unit. The directive ensures continued airworthiness by requiring repetitive special detailed inspections and corrective actions as necessary.
What changed
EASA Airworthiness Directive 2018-0148R1 revises the original AD 2018-0148 by clarifying that flight cycles accumulated by the TRU assembly can be used to determine inspection timing when TRU beam cycles are unknown. It introduces a new compliance table to improve understanding of initial inspection deadlines and clarifies inspection areas. These changes enhance clarity and applicability of inspection requirements.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk that could cause thrust reverser detachment, potentially damaging the engine and aircraft structure and posing hazards on the ground. Operators and maintenance teams must ensure compliance to prevent in-service failures and maintain regulatory approval for aircraft operation. Clear inspection intervals and criteria help streamline maintenance planning and risk mitigation.
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