- 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 | 61f28fc9…b001bc6 | FAA DRS (API key needed) |
On this page
The airworthiness directive
59-17-05 HELIO: Applies to All Model H-391B Aircraft Except Serial Numbers 093, 094, and 098; and Model H-395, Serial Numbers 502 Through 510.
Compliance required as indicated.
Within the next 10 hours unless already accomplished inspect the horizontal tail front spar splice plate, P/N 391-020-305, for cracks around all bolt holes and the 2.0-inches diameter lightening hole. If cracks are found, the fitting should be replaced with an identically dimensioned part 0.063-inch 4130 steel. If no cracks are found the original aluminum fitting shall be inspected at each 25 hours thereafter until the next 100-hour inspection or October 1, 1959, whichever occurs first, when it must be replaced with a steel part.
(Helio Service Bulletin No. 21 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