- Models
- 35, A35
- Data sheet
- TCDSA-777
- Registered aircraft
- 425 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 | 21 KB | f332686f…d506f00 | FAA DRS (API key needed) |
On this page
The airworthiness directive
51-14-01 BEECH: Applies to All Models 35 and A35 Aircraft Equipped With Unmodified Adel 20653 Electric Fuel Pump Installation.
Compliance was required as soon as possible, but in any event, not later than April 1, 1949.
To prevent the possibility of air leakage into the airplane's fuel system through a leaking shaft seal of the unmodified 20653 pump, this pump and associated installation components are to be removed from the airplane. Aircraft equipped with a modified fuel booster pump installation, which consists of a modified Adel 20653 electric-driven fuel pump (identified by either a 1/8 inch red band around the pump body, or the suffix "H" in the pump serial number, in series with a modified Thompson TF-1100 engine-driven fuel pump (identified by a "2" or "M2" stamped after the TF-1100 on the nameplate)) installed in accordance with Beech Installation Instructions, revised March 31, 1949, are not affected by this Airworthiness Directive.
(Beech Letter D-49-540 dated January 7, 1949, and Installation Instructions for the Model 35 Electric-Driven Auxiliary Fuel Pump, revised March 31, 1949, covers this same subject.)
This supersedes AD 49-28-02.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 425
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1947 | 171 |
|---|---|
| 1948 | 117 |
| 1949 | 42 |
| 1953 | 1 |
| 1955 | 1 |
| 1957 | 1 |
| 1962 | 1 |
91 with no year recorded