SA4-8
Wright R1820-87 and -60 engines and Hamilton Standard 6353A-18 propellers and modification fuel system and exhaust system. Held by Standard Airways. Last revised January 1, 1960. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Douglas Aircraft Co. Inc.
- Models
- Army B-18 Series
- Type certificate
- 2-577
- 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.