ST00846SE
Installation of Model 840037-108, 840037-112, and 840037-113 Transient Suppression Devices on Boeing 747 Classic Airplanes fitted with Honeywell Analog Fuel Quantity Indication Systems. Held by Butler National Corporation, which holds 18 approved modifications in all. Last revised October 6, 2000. System: fuel system.
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
- 747SP Series, 747-300 Series, 747-200 Series, 747-100 Series, 747SR Series
- Type certificates
- A20WE, A20WE, A20WE, A20WE, A20WE
- On this site
- Boeing 747 192 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 13, 2026.