SA09472SC
Modifications are only applicable to air conditioner systems. Held by Steinbach & Associates, INC., which holds 11 approved modifications in all. Last revised February 14, 2000. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Cessna Aircraft Company; Cessna Aircraft Company; Cessna Aircraft Company; Cessna Aircraft Company; Cessna Aircraft Company; Cessna Aircraft Company; Cessna Aircraft Company; Cessna Aircraft Company
- Models
- 335, 340, 401, 402, 404, 414, 421, 425
- Type certificates
- 3A25, 3A25, A7CE, A7CE, A25CE, A7CE, A7CE, A7CE
- On this site
- Cessna 335 26 registered
Cessna 340 707 registered
Cessna 401 51 registered
Cessna 402 174 registered
Cessna 404 26 registered
Cessna 414 Chancellor 605 registered
Cessna 421 Golden Eagle 769 registered
Cessna 425 Conquest I 161 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.