SA454SW
Installation of windshield alcohol system. Held by Signature Flight Support Corporation, which holds 335 approved modifications in all. Last revised August 31, 2000. System: airframe structure.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC; Twin Commander Aircraft LLC
- Models
- 500-A, 500-B, 560-F, 680-F, 680-F(P), 680-FL, 680-FL(P)
- Type certificates
- 6A1, 6A1, 2A4, 2A4, 2A4, 2A4, 2A4
- On this site
- Aero Commander 680 51 registered
- 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.