Main Rotor Drive — Main Gearbox — Replacement; Placards and Markings — ENG1 Training Idle Switch — Installation / Operational Restriction
Superseded. Comply with 2023-0148R1, which replaces this document.
- Published
- Effective
- Deadline
- Replaces
- 2019-0152-E
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of EC 225 LP helicopters with affected MGBs must determine flight hours on affected parts within specified compliance times, replace MGBs before exceeding 1000 flight hours, and install placards prohibiting use of the ENG1 Training Idle switch within defined deadlines. Reporting flight hour determinations to Airbus Helicopters within 30 days of the AD effective date is required. Alternative compliance methods are permitted under qualified supervision, and installation of serviceable MGBs is mandated from the effective date.
Summary
EASA Airworthiness Directive 2023-0148 is issued for Airbus Helicopters EC 225 LP models addressing main rotor drive main gearbox (MGB) replacement and installation of placards related to the ENG1 Training Idle switch. It applies to all EC 225 LP helicopters with specific affected MGB part numbers and introduces operational restrictions for one engine inoperative (OEI) training flights. The directive mandates inspections, part replacements, and placard installations to ensure continued airworthiness.
What changed
EASA AD 2023-0148 supersedes Emergency AD 2019-0152-E and expands the scope to include an additional MGB design (Group B) potentially affected by wear and broken roller cages. It retains previous requirements for repetitive MGB replacements and operational limitations while introducing new compliance times and allowing alternative compliance methods for affected parts. The AD also clarifies installation conditions for serviceable and affected MGBs and updates placard installation requirements.
Why it matters
This directive addresses a critical safety issue that could reduce the helicopter's ability to transfer OEI power from the right engine after left engine shutdown, potentially compromising flight control. Operators and maintenance organizations must comply to prevent in-flight failures related to MGB wear and damage. Compliance ensures continued airworthiness and operational safety during training and normal flights, avoiding regulatory penalties and enhancing safety margins.
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- EASA AD 2026-0166Fuselage – Splice of Frame X5295 – InspectionAug 19, 2026
- EASA AD 2026-0148Electrical Power – Direct Current Electrical Master Box – InspectionJul 28, 2026
- EASA AD 2023-0148R1Main Rotor Drive – Main Gearbox – Replacement; Placards and Markings – ENG1 Training Idle Switch – Installation / Operational RestrictionJul 24, 2026
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