SA495CE
Installation of Hartzell Model HC-A3XK-2B/7636D-4 or HC-A3VK-2B/V7636N-4 three-bladed propellers. Held by Williams Bob Or Barbara, which holds 9 approved modifications in all. Last revised August 24, 1989. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Piper Aircraft Inc.; Piper Aircraft Inc.
- Models
- PA-23-250, PA-23-235
- Type certificates
- 1A10, 1A10
- On this site
- Piper PA-23 Apache and Aztec 1,316 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.