AD 47-21-23
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sky Enterprises, Inc. | RC-3 | Airworthiness Directives; Republic Model RC-3 Aircraft |
Unsafe Condition
Loosening of engine cooling fan capscrews and tab locks could lead to fan and pulley sheave detachment, resulting in engine cooling system failure.
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Required Actions
Inspect engine cooling fan capscrews for tightness and tab locks for in-place condition. Replace capscrews with P/N 17778 drilled head capscrews, install plain washers, torque to 20 foot-pounds, and safety with 0.041-inch stainless steel wire. Reinspect after 5 hours of operation and reassemble properly each time the fan is removed.
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Compliance Time
before the next flight and after 5 hours of operation following each installation of fan
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Affected Aircraft
Republic Model RC-3 Aircraft with Engine Serial Numbers 23001 to 24083, Inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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