SA01408AT
Installation of National AirParts Model N300 alternators as replacement for belt-driven generators in accordance with National AirParts Inc., Document Number NAPI310, Cessna 310/320 Alternator Conversion , Initial Revision, dated 9/30/96 or later FAA Approved Revisions. Held by National Air Parts INC, which holds 2 approved modifications in all. Last revised June 24, 2011. System: electrical power.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Cessna Aircraft Company; The Cessna Aircraft Company
- Models
- 310, 320
- Type certificates
- 3A10, 3A25
- On this site
- Cessna 310 1,410 registered
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.