ST00847SE
Installation of Model 4035 Transient Suppression Units on Boeing 737 Classic Airplanes fitted with Smiths Digital Fuel Gauging Systems. Held by Ontic Engineering and Manufacturing INC., which holds 59 approved modifications in all. Last revised February 5, 2014. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company
- Models
- 737-100 Series, 737-400 Series, 737-300 Series, 737-500 Series, 737-200 Series
- Type certificates
- A16WE, A16WE, A16WE, A16WE, A16WE
- On this site
- Boeing 737 2,892 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.