SA1490NM
Installation of two Wright R1820-76B engines (per Aircraft Specification A-723, Note 12) on an aircraft previously modified by STC SA4-69. Held by Aerobase INC. Last revised April 2, 1982. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Lockheed Aircraft Corporation
- Models
- 18
- Type certificate
- A-723
- On this site
- Lockheed 18 13 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.