- Models
- HC-12X20-1, HC-12X20-2, HC-12X20-3, HC-12X20-4, HC-12X20-5, HC-12X20-6 and 30 more
- Product
- Propeller
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
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| FAA DRS HTML | 23 KB | 58d1187c…ccfca35 | FAA DRS (API key needed) |
On this page
The airworthiness directive
59-01-03 HARTZELL: Applies to HC-12X20, HC-13X20, HC-82X and HC-83X Series Propellers With Hub Serial Numbers As Indicated Herein.
Compliance required as indicated.
To minimize the possibility of failure of the split rings used to retain the blades in the hub, replace (if not previously accomplished) all unmarked split rings with new split rings marked with the letter "N", as follows:
(1) Prior to February 15, 1959.
HUB MODEL HUB SERIAL NO. INCLUSIVE HC-82XF-1DB, -1BB T-913 to T-2891 HC-82XF-2B F-400 to F-1675
(2) Prior to April 15, 1959.
HUB MODEL HUB SERIAL NO. INCLUSIVE HC-82X20-1B C-104 to C-267 HC-12X20-7D, 7C, 7E R-118 to R-260 HC-12X20-8D, 3C, 3E P-157 to P-494 HC-83X20-2C D-448 to D-1530 HC-83XF-2A U-105 to U-437 HC-83X20-2CL V-104 to V-179 HC-13X20-6L X-101 to X-111
(3) Prior to June 1, 1959.
HUB MODEL HUB SERIAL NO. INCLUSIVE HC-82XG-1D G-102 to G-305 HC-82XG-2B K-592 to K-2919 HC-82XL-1D100-Y to 121-Y HC-82XG-6B 100D to 169D
After compliance, stamp the letter "N" after the hub serial number. This letter "N" should be stamped on propellers already modified. Serial numbers of propellers modified at the factory are listed in Hartzell Bulletin No. 64. The aircraft log book should contain this information for propellers modified in the field.
(Hartzell Bulletin No. 64 covers this same subject.)
Affected TCDS · 4
The type certificate data sheets for the models this AD names, matched by model and maker.