SA557GL
Installation of Hartzell Propeller Models HC-E2YL-2BSF/F7663-6Q and HC-E2YL-2BLSF/FJ7663-6Q and Hartzell D-5749(P) or D-5749(P) spinners. Held by Hartzell Propeller INC, which holds 90 approved modifications in all. Last revised June 22, 1999. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The New Piper Aircraft Inc.; The New Piper Aircraft Inc.
- Models
- PA-39, PA-30
- Type certificates
- A1EA, A1EA
- On this site
- Piper PA-30 Twin Comanche 879 registered
Piper PA-39 Twin Comanche C/R 82 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 19, 2026.