SA731GL
Installation of Great Lakes left hand forward side window (pilot's) P/N W-2085, W/T-2085, W/G-2085 and/or right hand forward side window (door) P/N W-2086, W/T-2086, or W/G 2086. (PA-23-250 Sn 27-2349 and up) (PA-E23-250 SN 27-2349 and up). Held by Great Lakes Aero Products, which holds 3 approved modifications in all. Last revised June 26, 1984. System: airframe structure.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The New Piper Aircraft Inc.; The New Piper Aircraft Inc.
- Models
- PA-E23-250, PA-23-250
- Type certificates
- 1A10, 1A10
- On this site
- Piper PA-23 Apache and Aztec 1,316 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 12, 2026.