AD 75-04-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | American Champion Aircraft Corp. | 8GCBC | Airworthiness Directives; Bellanca Model 8GCBC Airplanes |
Unsafe Condition
Resonant vibratory conditions with McCauley Model 1A200/HFA fixed pitch propellers installed on Lycoming O-360-C2A or -C2E type engines.
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Required Actions
Remove existing tachometer markings, affix Mylar decal Bellanca P/N 1-10443 with specified RPM arcs and red radial, install placard Bellanca P/N 1-10437 below the hour meter, and revise the Airplane Flight Manual per Revision Number 1.
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Compliance Time
within the next 10 hours time in service after the effective date of this airworthiness directive
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Affected Aircraft
Bellanca Model 8GCBC Airplanes, Serial Numbers 1-74 through 119-74, 120-75 through 153-75 certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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