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Atlas / STC / SA372NW

FAA · Supplemental Type Certificate

STC SA372NW

Installation of a Wright R-975-30 engine; a Hamilton Standard 2D30/6167A-15 propeller; a inch Harrison oil cooler with ducting; and a modified Twin Beech (AT-11) cowl

Current Issued Aircraft Small Airplane Rev 11/01/1976 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 (1)

Certification basis — 14 CFR

Specific sections

  • Sec. 111
  • Sec. 113
  • Sec. 115
  • Sec. 117
  • Sec. 119
  • Sec. 120

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