SA1707CE
Installation of Global GNS-500A, Series 3A or 3B VLF/Omega navigation system. Held by Duncan Aviation, INC, which holds 158 approved modifications in all. Last revised July 15, 1982. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Fairchild Aircraft Corporation; Fairchild Aircraft Corporation
- Models
- SA227-TT, SA226-T(B)
- Type certificates
- A5SW, A5SW
- On this site
- Fairchild SA226 6 registered
Swearingen SA227 31 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.