Main Rotor — Hydraulic Drag Damper Lug — Replacement
- Published
- Effective
- Deadline
- Replaces
- 2014-0140R1
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must replace any affected hydraulic damper lugs (P/N TLH48-1-105 from batch 06 or earlier) within 50 flight hours after 10 June 2014 or before reaching 300 flight hours since installation, whichever is later. From 24 December 2014 onward, only serviceable parts as defined in the directive may be installed. Compliance must follow the instructions in WSK PZL Świdnik Mandatory Bulletin No. BO-60-13-65 revisions 1, 2, or 3.
Summary
EASA Airworthiness Directive 2014-0140R2 is a regulatory update addressing the replacement of hydraulic drag damper lugs on PZL SW-4 helicopters. It applies to helicopters fitted with main rotor hydraulic drag dampers Part Number TLH48-1 and targets specific lug parts with potential fatigue life issues. The directive mandates replacement of affected lugs to prevent failure that could lead to ground resonance and safety hazards.
What changed
This revision introduces the installation of a new lug part number TLH48-1-205 as an alternative to previously approved serviceable parts. It removes the retirement life limit for lugs from production batch 07 or later, reflecting improvements in manufacturing and fatigue life. Editorial changes were also made for standardization without affecting the core requirements.
Why it matters
This directive is critical for maintaining the structural integrity of the main rotor hydraulic drag damper on PZL SW-4 helicopters, directly impacting flight safety. Operators and maintenance organizations must ensure compliance to avoid potential ground resonance caused by lug failure. The update clarifies part eligibility and life limits, aiding in effective maintenance planning and regulatory adherence.
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