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Atlas / STC / SA5581SW

FAA · Supplemental Type Certificate

STC SA5581SW

Installation of ALCOR true-flow/ totalizer system

Current Reissued Aircraft Small Airplane Rev 05/27/2025 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 (135)

+ 85 more aircraft

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