SA3-438
Original Model: GC-1A, converted to GC-1B per 337 form dated 05/18/1959. Installed Lycoming O-290-D Engine and McCauley 1A-170-GM 7357 propeller for MSN 183 only. Held by Moody A. Larsen. Last revised October 20, 1959. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Swift Museum Foundation Inc.
- Models
- GC-1B
- Type certificate
- A-766
- 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 21, 2026.