SA00426AT
Installation of a composite WHOLLEY COWL. Held by Whelen Aerospace Technologies, which holds 57 approved modifications in all. Last revised January 24, 2023. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Piper Aircraft Inc.; Piper Aircraft Inc.
- Models
- PA-24-250, PA-24-260
- Type certificates
- 1A15, 1A15
- On this site
- Piper PA-24 Comanche 2,427 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 5, 2026.