STC ST01234SE

Installation of Model 4031-01 Transient Suppression Units on Boeing 737 Classic Airplanes fitted with the Simmonds (B.F. Goodrich) Analog Fuel Quantity Indication System in accordance with Smiths Aerospace Document Number 0181-ED, "Supplemental Type Certificate, Top level Drawing - Gauging Transient Suppression Unit for Boeing 737-100, -200, and -300 Aircraft," Revision C, dated June 13, 2003, or later FAA approved revision.

Historical Issued Aircraft Large Multi-Engine Rev 07/08/2003 View PDF on drs.faa.gov ↗

What is an STC?

A Supplemental Type Certificate authorizes a major modification or alteration to an FAA-certificated aircraft. STCs are how operators legally install new avionics, change fuel systems, add floats, swap engines, etc. — every change beyond a minor modification needs one.

Applicable aircraft (3)

Certification basis — 14 CFR

Specific sections

The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗