SA5969NM
Installation of Lycoming TIO-540- J2B(d) engine, Hartzell HC-C3YR-2UF/FC8468D-6R, or HC-C4YR-2/ FC6660 propeller and optional Merlyn Products MPI 98-1005-519 turbocharger. Held by Merlyn Products INC., which holds 35 approved modifications in all. Last revised December 13, 1996. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Twin Commander Aircraft Corporation; Twin Commander Aircraft Corporation; Twin Commander Aircraft Corporation
- Models
- 500-U, 500-B, 500-S
- Type certificates
- 6A1, 6A1, 6A1
- 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.