AD 84-25-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Standard Division | 23LF | HAMILTON STANDARD Model 23LF-335 and -371 Propellers |
Unsafe Condition
Cracks in the blades/counterweights could cause possible propeller failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Clean and inspect propeller blades and counterweights per Hamilton Standard ASB No. A27, Revision 1, November 1, 1984, or FAA approved equivalent. Replace cracked blades and counterweights prior to further flight.
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Compliance Time
within the next 20 hours time in service or before the next propeller landing reversal, whichever occurs first, following the effective date of this AD, unless already accomplished, and at every 50 propeller landing reversals thereafter
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Affected Aircraft
Hamilton Standard Division Model 23LF-335 and -371 propellers installed on, but not limited to, British Aerospace HP137 aircraft
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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