FAA · Supplemental Type Certificate
STC SH5690NM
Installation of Advanced Technology Aircraft Co. engine barrier filter.
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 (11)
- H1SW Bell Helicopter Textron Inc. · 204B
- H4NM Bell Helicopter Textron Inc. · UH-1E
- H5SO International Helicopters Inc. · UH-1B
- H7SO Overseas Aircraft Support Inc · UH-1E
- H3SO Richards Heavylift Helo Inc. · UH-1B
- H13WE Rotorcraft Development Corporation · UH-1B
- H3NM Rotorcraft Development Corporation · UH-1B
- H5NM Rotorcraft Development Corporation · UH-1E
- H1RM San Joaquin Helicopters · UH-1B
- H8NM Smith Helicopters · UH-1E
- H9NM West Coast Fabrications · UH-1E
Certification basis — 14 CFR
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗