SE157EA
Modification of AS-5999 to incorporate the use of flat sides. Held by Aircraft Supplies. Last revised January 1, 1960. System: engine.
What it applies to
- Kind of product
- Engine
- Design holder
- Pratt & Whitney Division
- Models
- Twin Wasp S1C3-G
- Type certificate
- E-186
- 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 5, 2026.