SE508AL
Addition of crankcase relief valve. Held by Univair Aircraft CORP, which holds 40 approved modifications in all. Last revised July 9, 1981. System: engine.
What it applies to
- Kind of product
- Engine
- Design holder
- Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines; Lycoming Engines
- Models
- O-320-A1A, O-320-A1B, O-320-A2A, O-320-A2B, O-320-A2C, O-320-A2D, O-320-A3A, O-320-A3B, O-320-A3C, O-320-B1A, O-320-B1B, O-320-B2A, O-320-B2B, O-320-B2C, O-320-B3A, O-320-B3B, O-320-B3C, O-320-C1A, O-320-C1B, O-320-C2A, O-320-C2B, O-320-C2C, O-320-C3A, O-320-C3B, O-320-C3C, O-320-D1A, O-320-D1B, O-320-D1C, O-320-D1D, O-320-D1F, O-320-D2A, O-320-D2B, O-320-D2C, O-320-D2F, O-320-D2G, O-320-D2H, O-320-D2J, O-320-D3G, O-320-E1A, O-320-E1B, O-320-E1C, O-320-E1F, O-320-E1J, O-320-E2A, O-320-E2B, O-320-E2C, O-320-E2D, O-320-E2F, O-320-E2G, O-320-E2H, O-320-E3D, O-320-E3H, O-320-H1AD, O-320-H1BD,...
- Type certificates
- E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274, E-274
- 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 7, 2026.