SA4-529
Short engine exhaust stacks and modified nacelle and exhaust shroud on aircraft equipped with Wright R-2600-29 engines. Held by Vanaero Company, which holds 14 approved modifications in all. Last revised August 6, 2007. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Douglas Aircraft Co. Inc.; Douglas Aircraft Co. Inc.
- Models
- Army B-23, Army UC-67
- Type certificates
- 2-576, 2-576
- 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.