AD 2020-15-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | PZL | Swidnik S.A. | Airworthiness Directives; PZL Swidnik S.A. Helicopters |
Unsafe Condition
Corrosion was found on the main rotor vibration absorber star during routine maintenance, which could lead to structural failure of the vibration absorber star, possibly resulting in damage to the main or tail rotor and subsequent loss of control of the helicopter.
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Required Actions
Visually inspect the main rotor vibration absorber star within an initial compliance time based on the helicopter serial number, and thereafter, repeat the inspections at intervals not to exceed 300 hours time-in-service (TIS) or 12 months, whichever occurs first. Inspect the main rotor vibration absorber star for paint coating delamination, blistering, and discoloration, and missing paint coating, a scratch, a dent, a nick, and corrosion. If there is any paint coating delamination, blistering, or discoloration, or missing paint, a scratch, a dent, a nick, or corrosion, mechanically remove any remaining paint coating. If there is no scratch, dent, nick, or corrosion, repair the paint coating. If there is a scratch, a dent, a nick, or corrosion less than the accumulated maximum total polishing depth of 0.5 mm, repair the surface. If there is a scratch, a dent, a nick, or corrosion that exceeds the accumulated maximum total polishing depth of 0.5 mm, remove the main rotor vibration absorber star from service. Inspect under each bolt head P/N 30.23.000.08.04 for corrosion. Inspect a main rotor vibration absorber star before being installed on any helicopter.
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Compliance Time
Within 300 hours time-in-service (TIS) or 12 months, whichever occurs first
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Affected Aircraft
PZL Swidnik S.A. Model PZL W-3A helicopters with main rotor vibration absorber star part number (P/N) 30.23.005.01.04 installed
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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