AD 58-07-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hartzell Propeller, Inc. | HC-12X20-1 | HARTZELL Models HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-2 | HARTZELL Models HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-3 | HARTZELL Models HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-4 | HARTZELL Models HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-5 | HARTZELL Models HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-6 | HARTZELL Models HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-7 | HARTZELL Models HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-8 | HARTZELL Models HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-12X20-9 | HARTZELL Models HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-13X20-5 | HARTZELL Models HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers |
Unsafe Condition
Fatigue failure of the split rings used to retain the blades in the hub
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace all unmarked split rings with new split rings marked with the letter 'N' which have a higher safety factor
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
at the next propeller overhaul
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Hartzell Propeller, Inc. models HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers
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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