FAA · Supplemental Type Certificate
STC SH770NW
Installation of a weighing system.
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 (17)
- 1H4 Sikorsky Aircraft Corporation · S-55
- 1H4 Sikorsky Aircraft Corporation · S-55B
- 1H4 Sikorsky Aircraft Corporation · S-55C
- 1H11 Sikorsky Aircraft Corporation · S-58A
- 1H11 Sikorsky Aircraft Corporation · S-58B
- 1H11 Sikorsky Aircraft Corporation · S-58BT
- 1H11 Sikorsky Aircraft Corporation · S-58C
- 1H11 Sikorsky Aircraft Corporation · S-58D
- 1H11 Sikorsky Aircraft Corporation · S-58DT
- 1H11 Sikorsky Aircraft Corporation · S-58E
- 1H11 Sikorsky Aircraft Corporation · S-58ET
- 1H11 Sikorsky Aircraft Corporation · S-58F
- 1H11 Sikorsky Aircraft Corporation · S-58FT
- 1H11 Sikorsky Aircraft Corporation · S-58G
- 1H11 Sikorsky Aircraft Corporation · S-58H
- 1H11 Sikorsky Aircraft Corporation · S-58HT
- 1H11 Sikorsky Aircraft Corporation · S-58J
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 ↗