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Atlas / STC / SA850GL

FAA · Supplemental Type Certificate

STC SA850GL

Modify airplane to fly on unleaded automotive gasoline, 87 minimum antiknock index. STC SE693GL approves unleaded automotive gasoline for certain Teledyne engines.

Historical Amended Aircraft Single-Engine Rev 12/09/1988 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 ↗