SA1637WE
Installation of cargo door approximately 80 inches high by 144 inches long in left side of fuselage forebody. Held by Lockheed Martin Aeronautics Company, which holds 42 approved modifications in all. Last revised April 26, 2004. System: airframe structure.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Lockheed Aircraft Corporation
- Models
- 188C
- Type certificate
- 4A22
- 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.