FAA · Supplemental Type Certificate
STC SA418NW
Installation of a float spreader assembly.
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 (12)
- 7A12 Aeronautica Macchi S.p.A. · AL 60-C5
- 7A12 Aeronautica Macchi S.p.A. · AL 60-F5
- TC 679 Consolidated Vultee Aircraft Corporation Stinson Division · SR-10D
- TC 679 Consolidated Vultee Aircraft Corporation Stinson Division · SR-10E (Army UC-81H)
- TC 679 Consolidated Vultee Aircraft Corporation Stinson Division · SR-10K
- A-717 Howard Aircraft Foundation · DGA-15P (Army UC-70; Navy GH-1; -2; -3; NH-1)
- 7A15 Pilatus Aircraft Limited · PC-6-H2
- 7A15 Pilatus Aircraft Limited · PC-6/350-H2
- 7A15 Pilatus Aircraft Limited · PC-6/A-H2
- 7A15 Pilatus Aircraft Limited · PC-6/B-H2
- 1A10 Piper Aircraft Inc. · PA-23-250
- A-806 Viking Air Limited · DHC-2 Mk.I
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 ↗