AD 94-10-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hartzell Propeller, Inc. | HC-E4A | HARTZELL PROPELLER INC. Model HC-E4A-3A/E10950() Propellers |
Unsafe Condition
Severe propeller vibration in flight and possible loss of propeller pitch control due to the use of countersunk screws in the propeller blade pitch change knob attachment bolts.
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Required Actions
Install new propeller blade pitch change knob twelve point flange head attachment bolts, new preload plates, and new propeller blade pitch change knob brackets per Hartzell Propeller Inc. Alert Service Bulletin No. A190. Compliance must be within 50 hours time in service after the effective date for propellers with 800+ hours TIS, or prior to exceeding 850 hours TIS since new or since prior service bulletin installation for others.
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Compliance Time
Within 50 hours time in service after the effective date (for propellers with 800+ hours TIS) or prior to exceeding the later of 850 hours TIS since new or 850 hours TIS since prior service bulletin installation.
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Affected Aircraft
Hartzell Propeller Inc. Model HC-E4A-3A/E10950() propellers except serial numbers HJ199 and greater, installed on but not limited to Beech Model 1900D aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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