AD 50-34-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Tarver Propellers, LLC | F200 | KOPPERS Model F200 Propellers |
Unsafe Condition
Blade retaining flanges, P/N 3277, may fail due to excessive torsional vibration in the 2,700 to 2,800 r.p.m. range, leading to crankshaft or propeller failures.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace blade retaining flanges P/N 3277 with P/N 3277-1 and suffix '-1' to the propeller assembly number on the nameplate. Restrict engine operation to 2,650 r.p.m. maximum and readjust propeller per Koppers Service Bulletin No. 22 for Universal (Stinson) Models 108-2 and 108-3.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required no later than April 1, 1952. For Universal (Stinson) Models 108-2 and 108-3: first 200 hours of propeller operation or May 16, 1949. For Models 108 and 108-1: first 400 hours of propeller operation. If total propeller operation time is unknown or exceeds 500 hours as of August 29, 1949, comply within next 50 hours of operation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Tarver Propellers, LLC Model F200 'Aeromatic' Propellers (excluding Model 220) installed on all aircraft, specifically Universal (Stinson) Models 108, 108-1, 108-2, and 108-3.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.