Main Rotor — Main Rotor Hub — Replacement
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of PZL SW-4 helicopters must replace any affected main rotor hub before it accumulates 600 flight hours since first installation, following the manufacturer's Alert Service Bulletin instructions. From the effective date, only serviceable MRHs may be installed, and any installed affected MRHs must be replaced within the specified flight hour limit. Compliance with these requirements is mandatory to continue operating the aircraft legally and safely.
Summary
EASA Airworthiness Directive 2020-0146 is an airworthiness directive issued by the European Union Aviation Safety Agency concerning PZL SW-4 helicopters. It addresses the replacement of main rotor hubs (MRH) equipped with specific bearings and inserts that have been found to wear prematurely. The directive applies to all serial numbers of PZL SW-4 helicopters and focuses on ensuring continued safe operation by managing the life limits of affected MRHs.
What changed
This new airworthiness directive introduces a mandatory replacement requirement for affected main rotor hubs installed on PZL SW-4 helicopters before they exceed 600 flight hours since first installation. It also establishes installation restrictions allowing only serviceable MRHs to be installed, with affected MRHs requiring replacement within the specified flight hour limit. The directive is supported by an Alert Service Bulletin from the manufacturer providing detailed instructions.
Why it matters
This directive is critical for aviation professionals because it addresses a safety risk related to wear in the bearings of the main rotor hub hydraulic drag damper mountings, which could lead to structural fatigue and reduced helicopter control. Operators and maintenance organizations must comply to prevent potential failures that could compromise flight safety. Compliance ensures continued airworthiness and regulatory adherence for PZL SW-4 helicopter fleets.
More for Wsk Pzl-Swidnik SW4
All 10- EASA AD 2023-0072Rotorcraft Flight Manual / Supplement — AmendmentApr 5, 2023
- EASA AD 2021-0244Time Limits / Maintenance Checks — Airworthiness Limitations — AmendmentNov 9, 2021
- EASA AD 2020-0275Time Limits / Maintenance Checks – Airworthiness Limitations – AmendmentDec 10, 2020
- EASA AD 2019-0300Main Rotor — Lower and Upper Torque Scissors — InspectionDec 12, 2019
- EASA AD 2014-0140R2Main Rotor — Hydraulic Drag Damper Lug — ReplacementOct 30, 2019
Get the next one by email
New ADs and bulletins for Wsk Pzl-Swidnik SW4 and PZL SW-4, summarized like this page, every Monday.