- Models
- Navion (Army L-17A), Navion A (Army L-17B and L-17C)
- Data sheet
- TCDSA-782
- Registered aircraft
- 633 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 | 21 KB | a212f062…67d3cbe | FAA DRS (API key needed) |
On this page
The airworthiness directive
49-05-03 NAVION: Applies to Airplanes Equipped With Continental Model E185-3 Engines Having Serial Numbers 4289-D to 5110-D Inclusive, and Engines Which Have Been Equipped at Overhaul With Tri-Metal Front Main Bearing Inserts and Bronze Thrust Washers in Accordance With Continental Bulletin No. M48-7.
To be accomplished as soon as possible but not later than the first major engine overhaul.
Because of unsatisfactory service experience with Continental E185-3 engines equipped with No. 530497 Tri-Metal front main bearing inserts, and with Nos. 530494, 530495, 530544 thrust washers and 530545 dowel pins, these parts must be replaced with the original silver main thrust bearing inserts, Continental No. 40644.
Continental Service Bulletin M48-30 covers this same subject.
(Ryan Navion Field Service Bulletin No. 5 outlines the interim precautions to be taken on airplanes equipped with the unsatisfactory thrust washers until silver main thrust bearings are installed in accordance with this note.)
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 633
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1946 | 103 |
|---|---|
| 1947 | 133 |
| 1948 | 143 |
| 1949 | 78 |
| 1950 | 21 |
| 1951 | 1 |
| 1953 | 1 |
| 1956 | 1 |
| 1958 | 2 |
| 1959 | 1 |
| 1963 | 1 |
148 with no year recorded