SA970SO
Installation of Lycoming TIO-540-J2BD or TIO-540-J2B engines and Hartzell propellers HC-C4YR-2/FC7663D-4R or HC-C4YR-2/FC7663D-6Q, additional fuel pump and related cowling changes.Modification Drawing Piper Navajo PA-31 Navajo-Panther-Drawing 68000, Revision D, Dated 5/17/82. Installation Instructions for Modification of Piper Navajo Model PA-31 and PA-31-325, Drawing 68000, change D dated 5/17/82 and Supplemental Type Certificate (STC) SA970SO. Installation Procedures Boost Pump PA-31 Drawing 62000 A Change dated November 30, 1977. (PA-31 Only) Piper Kit 760-905 Colemill Enterprises, Inc., Process Specification for Drawings 64000 and 66000, dated August 31, 1977. Colemill Enterprises, Inc., Process Specification #500 for Piper Wing Caps and Winglets, dated September 1, 1981. Later FAA approved revisions of the above data are acceptable. Held by Mike Jones Aircraft Sales INC., which holds 19 approved modifications in all. Last revised February 10, 2011. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Piper Aircraft Inc.; Piper Aircraft Inc.
- Models
- PA-31, PA-31-325
- Type certificates
- A20SO, A20SO
- 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 13, 2026.