FAA · Supplemental Type Certificate
STC SA5581SW
Installation of ALCOR true-flow/ totalizer 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 (135)
- 7A12 Aeronautica Macchi S.p.A. · AL60-B
- 7A12 Aeronautica Macchi S.p.A. · AL60
- 7A12 Aeronautica Macchi S.p.A. · AL60-F5
- 7A12 Aeronautica Macchi S.p.A. · AL60-C5
- A19EU Aeronautica Macchi S.p.A. & Aerfer-Industrie Aerospaziali Meridionali S.p.A. · AM-3
- 1A16 Ag Cat Corporation · G-164 Series
- 1A16 Ag Cat Corporation · G Series
- A25EU Agusta S.p.A. · S.210
- A-758 Aircraft Parts & Development Corp. · A Series
- H-1 Bell Helicopter Textron · 47 Series
- H-1 Bell Helicopter Textron · 47D1 Series
- H-1 Bell Helicopter Textron · 47G Series
- 1A3 Bellanca Aircraft Corporation · 14-19 Series
- 1A3 Bellanca Aircraft Corporation · 17 Series
- 1A9 Booth Lee F. dba Taylorcraft Aerospace · 19
- 1A9 Booth Lee F. dba Taylorcraft Aerospace · F19
- 1A9 Booth Lee F. dba Taylorcraft Aerospace · F21
- 1A9 Booth Lee F. dba Taylorcraft Aerospace · F21A
- 1A9 Booth Lee F. dba Taylorcraft Aerospace · F21B
- 1A9 Booth Lee F. dba Taylorcraft Aerospace · F22
- A11EU British Aerospace (Scotland) · B.206 Series 2
- A11EU British Aerospace (Scotland) · B.206 Series 1
- 3A10 The Cessna Aircraft Company · T310 Series
- 3A10 The Cessna Aircraft Company · 310 Series
- 3A11 The Cessna Aircraft Company · 321 (Navy OE-2)
- 3A12 The Cessna Aircraft Company · 172 Series
- 3A17 The Cessna Aircraft Company · R172 Series
- 3A17 The Cessna Aircraft Company · 175 Series
- 3A25 The Cessna Aircraft Company · 320 Series
- 3A25 The Cessna Aircraft Company · 340 Series
- 5A2 The Cessna Aircraft Company · 140A
- A-768 The Cessna Aircraft Company · 120
- A-768 The Cessna Aircraft Company · 140
- A-790 The Cessna Aircraft Company · 190
- A-790 The Cessna Aircraft Company · 195 Series
- A25CE The Cessna Aircraft Company · 406
- A25CE The Cessna Aircraft Company · 404
- A2CE The Cessna Aircraft Company · 336
- A4CE The Cessna Aircraft Company · U206 Series
- A4CE The Cessna Aircraft Company · TU206 Series
- A4CE The Cessna Aircraft Company · P206 Series
- A4CE The Cessna Aircraft Company · TP206 Series
- A4CE The Cessna Aircraft Company · 206 Series
- A6CE The Cessna Aircraft Company · T337 Series
- A6CE The Cessna Aircraft Company · 337 Series
- A7CE The Cessna Aircraft Company · 411 Series
- A7CE The Cessna Aircraft Company · 421 Series
- A7CE The Cessna Aircraft Company · 425
- A7CE The Cessna Aircraft Company · 414
- A7CE The Cessna Aircraft Company · 401 Series
+ 85 more aircraft
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗