AD 2021-18-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | PZL | Swidnik S.A. | Airworthiness Directives; PZL Swidnik S.A. Helicopters |
Unsafe Condition
displaced teeth were detected on the moveable assemblies of a main rotor (MR) blade droop stop, which could result in erroneous operation of MR blade droop stop teeth during engine start-up or shut-down, or dynamic drop-down of an MR blade, resulting in contact of the affected MR blade with the tail boom, and possibly resulting in injury of occupants or persons on the ground.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
remove from service the moveable assemblies from each affected MR blade droop stop and prohibit installation of an affected MR blade droop stop and moveable assemblies of affected MR blade droop stops
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
PZL Swidnik S.A. Model PZL W-3A helicopters, all manufacturer serial numbers
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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