SE2606CE
Add unleaded and leaded automotive gasoline, 91 minimum antiknock index(RON+MON)/2 per ASTM Specification D-439. Held by Petersen Aviation INC, which holds 167 approved modifications in all. Last revised August 23, 1990. System: engine.
What it applies to
- Kind of product
- Engine
- Design holder
- Textron Lycoming AVCO Corporation; Textron Lycoming AVCO Corporation; Textron Lycoming AVCO Corporation; Textron Lycoming AVCO Corporation; Textron Lycoming AVCO Corporation; Textron Lycoming AVCO Corporation; Textron Lycoming AVCO Corporation; Textron Lycoming AVCO Corporation; Textron Lycoming AVCO Corporation; Textron Lycoming AVCO Corporation
- Models
- O-235-N2C, O-235-P2C, O-235-P1, O-235-M3C, O-235-M1, O-235-L2A, O-235-M2C, O-235-P3C, O-235-L2C, O-235-P2A
- Type certificates
- E-223, E-223, E-223, E-223, E-223, E-223, E-223, E-223, E-223, E-223
- 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 21, 2026.