| AD Number | 47-21-05 | Status | Active |
| Effective Date | Not specified | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | N/A |
| Product Type | ["Aircraft"] | Product Subtype | ["Small Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Sierra Hotel Aero, Inc. |
| Model(s) | Navion (Army L-17A) |
47-21-05 NAVION: (Was Mandatory Note 4 of AD-782-3.) Applies to Serial Numbers NAV-4-11 Through 21 and 44 Through 47.
To be accomplished not later than August 1, 1947.
Replace the original propeller control with one that incorporates a positive friction lock in accordance with NAA Kit Drawing 145-89011.
(NAA Field Service Bulletin No. 5 covers this change.)