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Atlas / STC / SH3889SW

FAA · Supplemental Type Certificate

STC SH3889SW

Installation of 155 gallon capacity external auxiliary fuel system on high skid landing gear configured helicopter or 145 Gallon capacity external auxiliary fuel system on low skid landing gear configured helicopter.

Historical Reissued Aircraft Rotorcraft Rev 12/29/2006 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
  • § 21.47

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