SA4268SW
Installation of Pratt & Whitney PT6A-135 engines according to Drawing List 50,000L dated 12/11/79, revised 1/23/81, or later FAA approved revision. Held by Schafer Aircraft Modifications INC., which holds 2 approved modifications in all. Last revised May 23, 2001. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Piper Aircraft Inc.
- Models
- PA-31P
- Type certificate
- A8EA
- On this site
- Piper PA-31 Navajo and Chieftain 935 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 21, 2026.