Main Rotor — Swashplate — Inspection
Superseded. Comply with 2026-0127, which replaces this document.
- Published
- Effective
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of MBB-BK117 D-3 and D-3m helicopters must perform the initial swashplate inspection within specified flight hour limits or within 10 flight hours after 25 December 2025, whichever is later. Repetitive inspections must follow intervals based on measured vertical/radial play, and bolts must be replaced promptly if play exceeds 1.0 mm. Installation of bolts is permitted only if inspections are conducted before the next flight after installation.
Summary
EASA Airworthiness Directive 2025-0298-E is an emergency directive addressing the inspection of the main rotor swashplate on MBB-BK117 D-3 and D-3m helicopters. It mandates repetitive inspections of the swashplate bolts, specifically those with Part Number D623M2050206, due to reported excessive wear that could lead to bolt rupture and reduced helicopter control. The directive applies to all serial numbers of the affected helicopter models.
What changed
This new emergency airworthiness directive introduces mandatory repetitive inspections of the swashplate and its bearing bolts on MBB-BK117 D-3 and D-3m helicopters. It specifies compliance times for initial and repetitive inspections based on flight hours and measured vertical/radial play, and requires bolt replacement if play exceeds defined limits. The directive also allows installation of new bolts only if inspections are performed before the next flight.
Why it matters
This directive is critical for aviation professionals as it addresses a safety risk that could lead to loss of helicopter control due to swashplate bolt failure. Operators and maintenance organizations must ensure timely inspections and corrective actions to maintain airworthiness and comply with regulatory requirements. Failure to comply could result in unsafe flight conditions and regulatory penalties.
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