AD 86-10-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Wytwornia Sprzetu Komunikacyjnego | PZL-3S | WYTWORNIA SPRZETU KOMUNIKACYJNEGO "PZL-RZESZOW" Model PZL-3S Engines |
Unsafe Condition
Separation of the propeller from the aircraft due to distress in the rear crankshaft, rear counterweight, or rear counterweight pins, including wear, galling, pitting, scoring, and discoloration (blue color).
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Required Actions
Disassemble and visually inspect the rear crankshaft, rear counterweight, and rear counterweight pins. Replace any distressed parts with new parts and replace propeller attachment bolts and dowel pins if distress is found. Repeat inspections at intervals not exceeding 300 hours since last accomplishment.
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Compliance Time
Within 25 hours after the effective date of this AD for engines with 275 hours or more since new, since overhaul, or since compliance with AD 83-21-01. For engines with less than 275 hours, perform prior to reaching 300 hours since new, since overhaul, or since compliance with AD 83-21-01.
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Affected Aircraft
Wytwornia Sprzetu Komunikacyjnego "PZL-RZESZOW" Model PZL-3S piston engines, excluding the PZL-3S 2nd Series.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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