AD 59-26-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hartzell Propeller, Inc. | HC-12X20-1 | HARTZELL Models HC-12X20 Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-2 | HARTZELL Models HC-12X20 Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-3 | HARTZELL Models HC-12X20 Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-4 | HARTZELL Models HC-12X20 Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-5 | HARTZELL Models HC-12X20 Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-6 | HARTZELL Models HC-12X20 Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-7 | HARTZELL Models HC-12X20 Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-8 | HARTZELL Models HC-12X20 Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-9 | HARTZELL Models HC-12X20 Propellers |
Unsafe Condition
Hub spiders with specific serial numbers may fail, leading to possible propeller detachment.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service Hartzell hub spiders with serial numbers 1 through 4303, 4307 through 4316, 4318, 4319, 4321, 4323, 4324, 4325, 4328, 4329, 4332 through 4336, 4341. These removed hub spiders cannot be reused in certificated aircraft.
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Compliance Time
not later than March 1, 1960
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Affected Aircraft
Hartzell Propeller, Inc. HC-12X20 propellers with hub spiders having serial numbers 1 through 4303, 4307 through 4316, 4318, 4319, 4321, 4323, 4324, 4325, 4328, 4329, 4332 through 4336, 4341.
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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