- Model
- Navion (Army L-17A)
- Data sheet
- TCDSA-782
- Registered aircraft
- 373 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 | 99a8852e…5a430f9 | FAA DRS (API key needed) |
On this page
The airworthiness directive
47-21-10 NAVION: (Was Mandatory Note 9 of AD-782-3.) Applies to Serial Numbers NAV-4-2 Through HAV-4-1010 Which Incorporate Hartzell HC-12X20-1 Propellers.
To be accomplished not later than September 1, 1947.
The propeller control piston guide pins, Hartzell P/N A-11, require additional safetying in order to prevent loosening and subsequent loss of engine oil. This is accomplished by the installation of a 3/32-inch steel dowel through the guide pin.
(NAA Field Service Bulletin No. 30 covers this rework.)
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 373
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1946 | 78 |
|---|---|
| 1947 | 98 |
| 1948 | 88 |
| 1949 | 23 |
| 1950 | 2 |
| 1951 | 1 |
| 1956 | 1 |
| 1958 | 1 |
| 1959 | 1 |
80 with no year recorded