SA1604SO

Installation of wing external stores attach points on the lower surface of both wings. Held by Phoenix Air Group INC., which holds 10 approved modifications in all. Last revised May 29, 2024. System: airframe structure.

What it applies to

Kind of product: Aircraft
Design holder: Learjet Inc.; Learjet Inc.; Learjet Inc.; Learjet Inc.; Learjet Inc.; Learjet Inc.
Models: Learjet 36A, Learjet 35, Learjet 35A (C-21A), Learjet 25, Learjet 36, Learjet 25C
Type certificates: A10CE, A10CE, A10CE, A10CE, A10CE, A10CE
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.