FAA · Supplemental Type Certificate
STC SR09321RC
Installation of Improved Main Rotor Grips and Matching Adapter Nut
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 (24)
- H-1 Scotts-Bell 47 Inc · 47
- H-1 Scotts-Bell 47 Inc · 47B
- H-1 Scotts-Bell 47 Inc · 47B3
- H-1 Scotts-Bell 47 Inc · 47D
- H-1 Scotts-Bell 47 Inc · 47D1
- H-1 Scotts-Bell 47 Inc · 47E
- H-1 Scotts-Bell 47 Inc · 47G-2
- 2H3 Scotts-Bell 47 Inc · 47G-2A-1
- 2H3 Scotts-Bell 47 Inc · 47G-2A
- 2H3 Scotts-Bell 47 Inc · 47G-3
- 2H3 Scotts-Bell 47 Inc · 47G-3B-1
- 2H3 Scotts-Bell 47 Inc · 47G-3B-2
- 2H3 Scotts-Bell 47 Inc · 47G-3B-2A
- 2H3 Scotts-Bell 47 Inc · 47G-3B
- 2H3 Scotts-Bell 47 Inc · 47G-4
- 2H3 Scotts-Bell 47 Inc · 47G-4A
- 2H3 Scotts-Bell 47 Inc · 47G-5
- 2H3 Scotts-Bell 47 Inc · 47G-5A
- H-1 Scotts-Bell 47 Inc · 47G
- H-1 Scotts-Bell 47 Inc · 47H-1
- 2H1 Scotts-Bell 47 Inc · 47J-2
- 2H1 Scotts-Bell 47 Inc · 47J-2A
- 2H1 Scotts-Bell 47 Inc · 47J
- 2H1 Scotts-Bell 47 Inc · 47K
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 ↗