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Atlas / STC / SH4746NM

FAA · Supplemental Type Certificate

STC SH4746NM

Use of Mobil Oil Corp. 'Mobilgrease 28' synthetic grease to lubricate the main rotor head, swash plate and various associated linkages.

Historical Amended Aircraft Rotorcraft Rev 03/06/1991 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 ↗