SA1-139
Windshield from a four-place to a two-piece glass. Held by Ohio Aviation CO, which holds 15 approved modifications in all. System: airframe structure.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Lockheed Aircraft Corporation; Lockheed Aircraft Corporation; Lockheed Aircraft Corporation; Lockheed Aircraft Corporation
- Models
- 12-A (Navy JO-1), 12-A (Navy JO-2), 12-A (Army UC-40), 12-A (Army UC-40A)
- Type certificates
- 616, 616, 616, 616
- On this site
- Lockheed 12 15 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 7, 2026.