- Models
- H-391B, H-395 (USAF L-28A or U-10B)
- Data sheet
- TCDS1A8
- Registered aircraft
- 32 matched by model
- Product
- Aircraft · Small airplane
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 |
|---|---|---|---|
| FAA DRS HTML | 19 KB | 7c887e38…f415796 | FAA DRS (API key needed) |
On this page
The airworthiness directive
59-17-06 HELIO: Applies to All Model H-391B Aircraft and Model H-395, Serial Number 075 and 502 Through 509 Inclusive.
Compliance required within next 100 hours or by November 1, 1959, whichever occurs first. Install additional pulley guards at three 3-inch stabilator control system pulleys located at:
(a) The upper left-hand corner of the fuselage truss just aft of the firewall.
(b) Just forward of the lower left-hand side of the instrument panel.
(c) Directly under the forward attach point of the vertical stabilizer in the aft portion of the tail cone. (The cable makes a 180 degree turn around this pulley.)
(Helio Service Bulletin No. 20 covers this subject.)
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 32
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1954 | 1 |
|---|---|
| 1956 | 5 |
| 1957 | 3 |
| 1958 | 4 |
| 1959 | 2 |
| 1960 | 2 |
| 1962 | 4 |
| 1963 | 3 |
8 with no year recorded