AD Amdt-39-9457
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer | EMB-120 | Airworthiness Directives; Empresa Brasileira de Aeronautica, S.A. (EMBRAER) Model EMB-120 Series Airplanes |
Unsafe Condition
Operation of Hamilton Standard 14RF series propellers at or near 73% of the nominal propeller RPM during ground operations in adverse winds can produce high vibration stresses, accelerating fatigue cracking at existing internal corrosion pits and leading to propeller failure and reduced controllability.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the Airplane Flight Manual (AFM) to limit ground propeller RPM to MIN RPM (approximately 50%), except for brief excursions. Remove existing placard and install a new placard on the cockpit instrument panel. Revise the FAA-approved maintenance program to limit maximum ground operation RPM.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
All EMBRAER Model EMB-120 series airplanes equipped with Hamilton Standard 14RF series propellers.
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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