58-07-01: Split Rings
FAA order 58-07-01 is an airworthiness directive. The FAA's subject line: Split Rings. System: propeller.
What it applies to as the FAA lists it
- Kind of product
- Propeller
- Makes
- Hartzell Propeller, Inc.
- Models
- HC-12X20-1, HC-12X20-2, HC-12X20-3, HC-12X20-4, HC-12X20-5, HC-12X20-6, HC-12X20-7, HC-12X20-8, HC-12X20-9, HC-13X20-5, HC-13X20-6, HC-13X20-8, HC-82-XK-1, HC-82-XK-2, HC-82-XK-3, HC-82X20-1, HC-82X20-3, HC-82X20-5, HC-82XF-1, HC-82XF-2, HC-82XF-3, HC-82XF-6, HC-82XG-1, HC-82XG-2, HC-82XG-6, HC-82XL-1, HC-82XL-2, HC-82XL-6, HC-82XS-2, HC-83X20-1, HC-83X20-2, HC-83XF-1, HC-83XF-2, HC-83XF-3, HC-83XK-1, HC-83XK-2
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (633 characters)
58-07-01 HARTZELL: Applies to All HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers.
Compliance required at the next propeller overhaul.
To minimize the possibility of fatigue failure of the split rings used to retain the blades in the hub, replace all unmarked split rings with new split rings marked with the letter "N". The new production rings have a higher safety factor. Recent failures involving the old type split rings have been covered in airworthiness directives concerned with the particular propeller model or hub-blade combination involved.
(Hartzell Service Bulletin No. 58 covers this same subject.)
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/58-07-01.json · aircraft systems.