- Effective
- September 1, 1963
- Models
- H-391B, H-395 (USAF L-28A or U-10B), H-395A
- Data sheet
- TCDS1A8
- Registered aircraft
- 33 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 | dece2aef…4d983b6 | FAA DRS (API key needed) |
On this page
The airworthiness directive
63-18-02 HELIO: Amdt. 609 Part 507 Federal Register August 31, 1963. Applies to All Models H-391B, H-395 Serial Numbers 1 to 591, Inclusive, and H-395A Serial Numbers 1 to 1008, Inclusive.
Compliance required prior to September 15, 1963.
To preclude possible loss of engine oil through the vacuum oil separator due to blockage of the engine breather tube with ice or snow, accomplish the following:
Modify the oil breather tube P/N 391-060-317 by slicing a flute cut 18 inches from contour of lower cowl 0.25 to 0.31 inch depth and 0.75 inch in height on aft side of tube. This cut can be added to the present breather tube.
(Helio Service Bulletin No. 30A dated April 20, 1963, covers this same subject.)
This supersedes AD 62-12-05. This directive effective September 1, 1963.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 33
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 | 5 |
| 1963 | 3 |
8 with no year recorded