AD 94-06-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Sundstrand | 14RF-19 | HAMILTON STANDARD Model 14RF-9, 14RF-19, and 14RF-21 Propellers |
| aircraft | Hamilton Sundstrand | 14RF-21 | HAMILTON STANDARD Model 14RF-9, 14RF-19, and 14RF-21 Propellers |
| aircraft | Hamilton Sundstrand | 14RF-9 | HAMILTON STANDARD Model 14RF-9, 14RF-19, and 14RF-21 Propellers |
Unsafe Condition
Propeller hub cracking and loss of engine oil, and possible loss of a propeller blade or hub.
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Required Actions
Perform an initial torque check of the propeller hub retaining nuts within 30 days after the effective date. If retaining nuts do not meet acceptance criteria, remove the hub for crack inspection and replace if cracked. Loosen and retighten retaining nuts per specified procedures if initial check is acceptable. Conduct repetitive torque checks every 500 hours time in service. Inspect oil leakage at next line check or within 70 hours TIS, and replace propeller if leakage is not from blade seal, pressure relief valve, or actuator assembly. Record all actions and torque values.
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Compliance Time
Within 30 days after the effective date of this AD
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Affected Aircraft
Hamilton Standard Model 14RF-9, 14RF-19, and 14RF-21 propellers installed on Embraer EMB-120 series, CASA CN-235 series, and SAAB-SCANIA SF340 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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