FAA · Supplemental Type Certificate
STC SH506GL
Installation of modified tail rotor gearbox using original installation hardware and components.
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 (8)
- H-1 Bell Helicopter Textron · 47D (USAF H-13B)
- H-1 Bell Helicopter Textron · 47E (Navy HTL-3)
- H-1 Bell Helicopter Textron · 47G-2 (USAF H-13H)
- H-1 Bell Helicopter Textron · 47H-1
- H-1 Bell Helicopter Textron · 47D1 Series
- H-1 Bell Helicopter Textron · 47G Series
- H-1 Bell Helicopter Textron · 47B
- H-1 Bell Helicopter Textron · 47B3
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 ↗