Main Rotor — Lower and Upper Torque Scissors — Inspection
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators and maintenance personnel must inspect the identification markings and orientation of Lower and Upper Torque Scissors parts before each installation on PZL SW-4 helicopters starting from 26 December 2019. If any incorrectly marked parts are detected, they must contact WSK "PZL-Świdnik" S.A. for corrective action instructions and implement them before the next flight. Compliance with the WSK Alert Service Bulletin ASB-60-19-96 is required.
Summary
EASA Airworthiness Directive 2019-0300 is an airworthiness directive addressing the inspection of Lower and Upper Torque Scissors on PZL SW-4 helicopters. It applies to all serial numbers of this helicopter model and focuses on specific parts including Lower Torque Scissors P/N 60.02.250.00.01 and Upper Torque Scissors P/N 60.02.260.00.02. The directive mandates inspections to ensure correct installation and orientation of these parts to maintain safe helicopter control.
What changed
This new airworthiness directive introduces mandatory repetitive inspections of the Lower and Upper Torque Scissors parts before each installation on PZL SW-4 helicopters. It requires verification of identification markings and correct positioning of related components to prevent incorrect installation. If incorrectly marked parts are found, operators must contact the manufacturer for corrective instructions before further flight.
Why it matters
This directive is critical for aviation professionals because incorrect installation of torque scissors can lead to restricted collective and cyclic pitch control, potentially reducing helicopter controllability. Ensuring compliance helps maintain flight safety and prevents damage caused by residual plastic strain and wear on critical rotor components. Operators and maintenance teams must adhere to these inspections to avoid unsafe conditions and regulatory non-compliance.
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 2020-0146Main Rotor — Main Rotor Hub — ReplacementJul 2, 2020
- EASA AD 2014-0140R2Main Rotor — Hydraulic Drag Damper Lug — ReplacementOct 30, 2019
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New ADs and bulletins for Wsk Pzl-Swidnik SW4 and PZL SW-4, summarized like this page, every Monday.