SA123NW
Installation of a modified landing gear axle to accommodate Goodyear 29x13x5 airwheel and tire assembly with Cleveland brakes. Held by Christensen, Roger D., which holds 2 approved modifications in all. Last revised August 2, 1974. System: landing gear.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Piper Aircraft Inc.
- Models
- PA-18-150
- Type certificate
- 1A2
- On this site
- 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 22, 2026.