SA4-557
Wing center-section fittings (front and rear). Held by Cunningham Dudley H. Last revised August 5, 1958. System: airframe structure.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Curtiss-Wright Corporation
- Models
- Travel Air 4000
- Type certificate
- ATC 32
- On this site
- Curtiss Wright TRAVEL AIR 4000 55 registered
- The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 20, 2026.