EASA AD 2019-0129
Stabilizers — Horizontal Stabilizer Rear Attachment Bolts — Inspection / Replacement
Summary
EASA Airworthiness Directive 2019-0129 is an official regulatory document addressing the inspection and replacement of horizontal stabilizer rear attachment bolts on Pilatus PC-12 series aeroplanes, including PC-12, PC-12/45, PC-12/47, and PC-12/47E models. The directive targets bolts with specific part and production order numbers that were improperly heat treated during manufacturing. It mandates replacement of these affected bolts to ensure continued airworthiness and flight safety.
What Changed
EASA Airworthiness Directive 2019-0129 introduces a new requirement for operators of Pilatus PC-12 series aircraft to replace horizontal stabilizer rear attachment bolts identified as having improper heat treatment. It prohibits the installation or reinstallation of these affected bolts and requires replacement within a specified timeframe. This directive does not supersede any previous ADs.
Why It Matters
This directive is critical for aviation professionals because the affected bolts have reduced material properties that could lead to fatigue failure, potentially resulting in loss of control of the aircraft. Operators, maintenance organizations, and compliance teams must address this unsafe condition promptly to maintain aircraft safety and regulatory compliance. Failure to comply could compromise aircraft structural integrity and safety.
What To Do
Operators of Pilatus PC-12, PC-12/45, PC-12/47, and PC-12/47E aeroplanes with affected bolts must replace each affected horizontal stabilizer rear attachment bolt within 1,350 flight hours or 13 months from 20 June 2019, whichever occurs first. Additionally, no affected bolts may be installed or reinstalled on any aircraft after the effective date. Compliance must follow the instructions in Pilatus Aircraft PC-12 Service Bulletin No. 55-004.
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