SA4-608
Engine mount core assemblies DE-643-1 on Wright TC18 Series engines. Held by Dow-Elco INC, which holds 7 approved modifications in all. Last revised September 23, 1958. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Lockheed Aircraft Corporation; Lockheed Aircraft Corporation; McDonnell Douglas Corporation
- Models
- 1649A-98, 1049 Series, DC-7 Series
- Type certificates
- 4A17, 6A5, 4A10
- On this site
- Douglas DC-7 5 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.