SA02146AK-D
Fabrication and installation of Aero Twin, Inc. main landing gear outboard door hinge kit No. DH31-200-1. Held by Aero Twin, INC, which holds 30 approved modifications in all. Last revised October 5, 1999. System: landing gear.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.
- Models
- PA-31-350, PA-31-325, PA-31-300, PA-31, PA-31P, PA-31T2, PA-31P-350, PA-31T1, PA-31T3, PA-31T
- Type certificates
- A20SO, A20SO, A20SO, A20SO, A8EA, A8EA, A8EA, A8EA, A8EA, 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.