AD 81-13-06 R2
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Standard Division | Hamilton Sundstrand | 22D | HAMILTON STANDARD: Hydromatic (noncounterweighted) propellers with aluminum blades |
| aircraft | Hamilton Standard Division | Hamilton Sundstrand | 23D | HAMILTON STANDARD: Hydromatic (noncounterweighted) propellers with aluminum blades |
| aircraft | Hamilton Standard Division | Hamilton Sundstrand | 24D | HAMILTON STANDARD: Hydromatic (noncounterweighted) propellers with aluminum blades |
| aircraft | Hamilton Standard Division | Hamilton Sundstrand | 24E | HAMILTON STANDARD: Hydromatic (noncounterweighted) propellers with aluminum blades |
| aircraft | Hamilton Standard Division | Hamilton Sundstrand | 33D | HAMILTON STANDARD: Hydromatic (noncounterweighted) propellers with aluminum blades |
| aircraft | Hamilton Standard Division | Hamilton Sundstrand | 33E | HAMILTON STANDARD: Hydromatic (noncounterweighted) propellers with aluminum blades |
| aircraft | Hamilton Standard Division | Hamilton Sundstrand | 34D | HAMILTON STANDARD: Hydromatic (noncounterweighted) propellers with aluminum blades |
| aircraft | Hamilton Standard Division | Hamilton Sundstrand | 34E | HAMILTON STANDARD: Hydromatic (noncounterweighted) propellers with aluminum blades |
| aircraft | Hamilton Standard Division | Hamilton Sundstrand | 43D | HAMILTON STANDARD: Hydromatic (noncounterweighted) propellers with aluminum blades |
| aircraft | Hamilton Standard Division | Hamilton Sundstrand | 43E | HAMILTON STANDARD: Hydromatic (noncounterweighted) propellers with aluminum blades |
Unsafe Condition
Propeller blade failure due to corrosion and fatigue in the blade fillet and shank area, particularly under the teflon friction reduction strip and the resin corrosion barrier.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect propeller blades within the next 90 days after July 1, 1982, or within 18 months since last inspection, whichever occurs later, for corrosion in the blade fillet and shank area. Reinspect at intervals not exceeding 18 months if corrosion is found, or extend intervals up to 36 or 60 months if no corrosion or within repairable limits. Replace or repair blades with corrosion prior to further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 90 days after July 1, 1982, or within 18 months since last inspection, whichever occurs later
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Hamilton Standard Hydromatic (noncounterweighted) propellers with aluminum blades of types: 22D30, 22D40, 23D40, 23E50, 23E60, 24D50, 24E60, 33D50, 33E60, 34D50, 34D51, 34E60, 43D50, 43D51, 43E60, and 43H60, installed on various reciprocating engine-powered 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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