SA683SW
Convert from monoplane to biplane configuration by adding all metal lower wings. Held by Noble Air Service. Last revised October 20, 1994. System: airframe structure.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Piper Aircraft Inc.; Piper Aircraft Inc.; Piper Aircraft Inc.; Piper Aircraft Inc.; Piper Aircraft Inc.; Piper Aircraft Inc.; Piper Aircraft Inc.; Piper Aircraft Inc.; Piper Aircraft Inc.; Piper Aircraft Inc.; Piper Aircraft Inc.; Piper Aircraft Inc.
- Models
- J3C-65 (Army L-4; L-4A; L-4B (Navy NE-1); L-4H; L-4J (Navy NE-2)), PA-18-105 (Special), PA-18-125 (Army L-21A), PA-18-135, PA-18-150, PA-18, PA-18A-135 (Restricted), PA-18A-135, PA-18A-150 (Restricted), PA-18A-150, PA-18A (Restricted), PA-18A
- Type certificates
- A-691, 1A2, 1A2, 1A2, 1A2, 1A2, AR-7, 1A2, AR-7, 1A2, AR-7, 1A2
- On this site
- Piper J-3 Cub 3,804 registered
Piper PA-18 Super Cub 3,620 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.