SA4629NM
Fabrication of Model 8400 brake booster assemblies, and modification of Scott Aviation Model B-711 brake master cylinders by installation of said assemblies. Held by Northern Piper Aviation INC., which holds 6 approved modifications in all. Last revised January 26, 2006. System: landing gear.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.
- Models
- J3C-40, J3C-50, J3C-65 (Army L-4; L-4A; L-4B (Navy NE-1); L-4H; L-4J (Navy NE-2)), PA-11
- Type certificates
- A-691, A-691, A-691, A-691
- On this site
- Piper J-3 Cub 3,804 registered
Piper PA-11 Cub Special 443 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.