SE4157NM
Installation of modified turbochargers, controller, wastegate actuator and link, scavenge pump and manifold pressure relief valves. Held by Merlyn Products INC., which holds 35 approved modifications in all. Last revised May 8, 1990. System: engine.
What it applies to
- Kind of product
- Engine
- Design holder
- Lycoming Engines
- Models
- IO-540-AA1A5
- Type certificate
- 1E4
- 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.