- Models
- D18C, D18C-T, D18S
- Data sheets
- TCDSA-765TCDSTC 770
- Registered aircraft
- 55 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 January 21, 2026.
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 | cf6737b5…a88c227 | FAA DRS (API key needed) |
On this page
The airworthiness directive
47-33-07 BEECH: (Was Mandatory Note 2 of AD-770-1 and Mandatory Note 3 of AD- 765-1.) Applies to D18S, D18C and D18C-T Airplanes With Static Alternate Source Selector Valve.
Compliance required prior to October 15, 1947.
The present alternate static source does not comply with the Civil Air Regulations. The static selector valve should be removed and the AN 6270-4-22 flexible hose connected to the Beech 407-184756 static pressure tube by means of an 815-4D union.
(Beech Service Bulletin D18-47 covers this same subject.)
Affected TCDS · 2
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 55
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1943 | 1 |
|---|---|
| 1945 | 3 |
| 1946 | 15 |
| 1947 | 2 |
| 1948 | 2 |
| 1949 | 1 |
| 1950 | 1 |
| 1951 | 2 |
| 1952 | 6 |
| 1953 | 4 |
| 1954 | 2 |
| 1958 | 1 |
| 1966 | 1 |
14 with no year recorded