SA00722CH
Installation of Hartzell HC-C2YK-2CUF/FC7666C(B)-4 propellers and 836-29(P) spinners. Held by Hartzell Propeller INC, which holds 90 approved modifications in all. Last revised July 29, 1997. System: propeller.
What it applies to
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 21, 2026.