Doors – Jettisonable Windows and Seals on the Sliding Doors and Fixed Panels – Modification
Superseded. Comply with 2026-0011, which replaces this document.
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Airbus Helicopters EC 155 B and B1 must replace the jettisonable windows and seals on sliding doors and fixed panels on both sides of the helicopter and install new labels. This modification must be completed before exceeding 600 flight hours or within 24 months from the effective date of 18 September 2024, whichever occurs first. Compliance must follow the instructions in Airbus Helicopters Alert Service Bulletin EC155-56-50-0001.
Summary
EASA Airworthiness Directive 2024-0173 is an airworthiness directive issued by the European Union Aviation Safety Agency affecting Airbus Helicopters EC 155 B and EC 155 B1 models. It addresses the modification of jettisonable windows and seals on the sliding doors and fixed panels to ensure proper emergency egress capability. This directive mandates specific modifications to improve safety during emergency evacuations.
What changed
EASA Airworthiness Directive 2024-0173 introduces a required replacement of the jettisonable windows and seals on both left-hand and right-hand sliding doors and fixed panels of EC 155 helicopters. The directive is based on findings that the force required to jettison windows exceeded acceptable limits, potentially compromising emergency evacuation. The modification includes installation of new labels and must be done following Airbus Helicopters Alert Service Bulletin EC155-56-50-0001.
Why it matters
This directive is critical for aviation professionals as it ensures that emergency egress windows function within required force limits, enhancing occupant safety during emergencies. Operators and maintenance organizations must comply to maintain aircraft airworthiness and avoid operational restrictions. Compliance also prevents potential injury to occupants by ensuring windows can be jettisoned effectively when needed.
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