Airworthiness Limitation Section – TT-Straps – Storage Life Limit
Superseded. Comply with 2021-0142, 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 must inspect and replace Bendix and Lord TT-Straps within the compliance times specified in the directive, which vary depending on the straps' storage and total life. Bendix TT-Straps must be removed from service and are prohibited from installation from the effective date. Installation of Lord TT-Straps is only permitted if their storage life does not exceed five years. Compliance deadlines range from immediate (within 8 weeks) to during the next periodic inspection depending on strap age.
Summary
EASA Airworthiness Directive 2019-0024 is an airworthiness directive issued by the European Union Aviation Safety Agency affecting Airbus Helicopters Deutschland GmbH BO105 helicopter models including BO105 A, C, D, S, and LS A-3 variants. The directive addresses the storage life limits and service life of specific Bendix and Lord Tension Torsion (TT) straps used in these helicopters to ensure continued airworthiness and safety.
What changed
This directive introduces mandatory storage life limits for certain TT-Straps and prohibits the installation or reinstallation of Bendix TT-Straps on affected helicopters. It requires replacement of Bendix and Lord TT-Straps with serviceable parts within specified compliance times based on the straps' storage and total life. The directive also sets conditions for the installation of Lord TT-Straps, limiting their storage life to no more than five years before first flight after installation.
Why it matters
This directive is critical for aviation professionals because aging elastomeric materials in TT-Straps can compromise structural integrity, potentially leading to premature failure and loss of helicopter control. Operators, maintenance organizations, and compliance teams must adhere to these limits to maintain safety and regulatory compliance, preventing unsafe conditions that could result in accidents.
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