SA4359NM
Installation of redesigned upper door hinge pin and retainer. Held by Heyworth Eugene, which holds 4 approved modifications in all. Last revised May 17, 1999. System: airframe structure.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Cessna Aircraft Company; Cessna Aircraft Company; Cessna Aircraft Company; Cessna Aircraft Company
- Models
- 177B, 177A, 177, 177RG
- Type certificates
- A13CE, A13CE, A13CE, A20CE
- On this site
- Cessna 177 Cardinal 2,158 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.