- Model
- GO-435-C2 (O-435-17)
- Data sheet
- TCDSE-228
- Registered aircraft
- 2 matched by model
- Product
- Engine
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 | ed4d6bdc…92b1a4e | FAA DRS (API key needed) |
On this page
The airworthiness directive
51-24-01 LYCOMING: Applies to All Lycoming GO-435-C2 Engines Serially Numbered 1815-11 and Below Not Having the Letter "P" Stamped on the Upper Right-hand Corner of Each Cylinder Rocker Box and Installed in Navion Model B Aircraft. To be accomplished by June 1, 1952 or next overhaul, whichever occurs first. To prevent loosening of the exhaust valve seats in Lycoming GO-435-C2 engines installed in Navion Model B airplanes, the exhaust valve seats are to be peened in the cylinder head. The cylinders must be removed from the engine for this operation. When peening is accomplished, stamp "P" 1/8 inch high on upper right-hand corner of cylinder rocker box flange face near exhaust push rod. (Lycoming Service Bulletin No. 145 also covers this subject.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 2
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.