SA00040LB

Installation of a modified exhaust tail pipe. Held by Aerospace Welding Minneapolis INC., which holds 15 approved modifications in all. Last revised November 17, 2023. System: engine.

What it applies to

Kind of product: Aircraft
Design holder: The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company
Models: T310P, T310Q, T310R, 320D, 320E, 320F, 335, 401B, 402B, 401, 402, 401A, 402A
Type certificates: 3A10, 3A10, 3A10, 3A25, 3A25, 3A25, 3A25, A7CE, A7CE, A7CE, A7CE, A7CE, A7CE
On this site: Cessna 320 137 registered
Cessna 335 26 registered
Cessna 401 51 registered
Cessna 402 174 registered
Cessna T-310 207 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 20, 2026.