SA4287WE
Installation of inflatable door seal. Held by Bob Fields Aerocessories, which holds 12 approved modifications in all. Last revised December 15, 1980. System: airframe structure.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company
- Models
- 320B, 320A, 320C, 320D, 320E, 320F, 320-1, 320
- Type certificates
- 3A25, 3A25, 3A25, 3A25, 3A25, 3A25, 3A25, 3A25
- On this site
- Cessna 320 137 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.