# AD 58-07-01: Split Rings

- Type: Airworthiness directive
- Status: Current
- Products: Hartzell Propeller 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 and 24 more
- Superseded by: Nothing supersedes this AD
- Product type: Propeller
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BE76A6F6B31D461786256965004C484C.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/58-07-01

## The airworthiness directive

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.)

## Affected data sheets (4) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS P-878](https://openairdocs.org/tcds/P-878): Hartzell Propeller Inc.; names 17 of 17 models: HC-82XF-1, HC-82XL-6, HC-82XF-6, HC-82X20-5, HC-82XF-3, HC-82XG-2, HC-82XG-1, HC-82-XK-2…
- [TCDS P-845](https://openairdocs.org/tcds/P-845): Hartzell Propeller Inc.; names 9 of 9 models: HC-12X20-7, HC-12X20-5, HC-12X20-6, HC-12X20-4, HC-12X20-9, HC-12X20-3, HC-12X20-2, HC-12X20-1…
- [TCDS P-884](https://openairdocs.org/tcds/P-884): Hartzell Propeller Inc.; names 7 of 7 models: HC-83XK-2, HC-83XK-1, HC-83XF-1, HC-83XF-3, HC-83XF-2, HC-83X20-1, HC-83X20-2
- [TCDS P-888](https://openairdocs.org/tcds/P-888): Hartzell Propeller Inc.; names 3 of 3 models: HC-13X20-8, HC-13X20-6, HC-13X20-5

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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