FAA · Supplemental Type Certificate
STC SA420CH
Install Unison Limited Authority Spark Advance Regulator ignition 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 (61)
- A-758 Aircraft Parts & Development Corp. · A-5
- A-758 Aircraft Parts & Development Corp. · A-5T
- A-759 American Champion Aircraft Corp. · 7GCAA
- A-759 American Champion Aircraft Corp. · 7GCB
- A-759 American Champion Aircraft Corp. · 7GCA
- A-759 American Champion Aircraft Corp. · 7KC
- A-759 American Champion Aircraft Corp. · 7GCBC
- A-759 American Champion Aircraft Corp. · 7GCBA
- A-754 Arctic Aircraft Company Inc. · S-1B2
- 4A19 Augustair Inc. · 2150
- 4A19 Augustair Inc. · 2150A
- A15EA BOHICA Incorporated · TSC-1A2
- A15EA BOHICA Incorporated · TSC-1A
- A15EA BOHICA Incorporated · TSC-1A1
- A22EU British Aerospace (Scotland) · B.121 Series 2
- A22EU British Aerospace (Scotland) · B.121 Series 3
- A57EU Burkhart Grob Luft-Und · G115B
- A57EU Burkhart Grob Luft-Und · G115C
- 3A12 The Cessna Aircraft Company · 172K
- 3A12 The Cessna Aircraft Company · 172L
- 3A12 The Cessna Aircraft Company · 172M
- 3A12 The Cessna Aircraft Company · 172N
- 3A12 The Cessna Aircraft Company · 172P
- 3A12 The Cessna Aircraft Company · 172I
- A13CE The Cessna Aircraft Company · 177
- A27EU DaimlerChrysler Aerospace AG · BO-209-150 FV & RV
- A27EU DaimlerChrysler Aerospace AG · BO-209-150 FF
- 1A21 Dynac Aerospace Corporation · 100
- A75EU General Avia Costruzioni Aeronautiche · F22B
- 3A23 Maule Aerospace Technology Inc. · Bee Dee MXT-7-160
- 3A23 Maule Aerospace Technology Inc. · Bee Dee MX-7-160
- 2A3 Mooney Aircraft Corporation · M20
- 1A10 The New Piper Aircraft Inc. · PA-23
- 1A10 The New Piper Aircraft Inc. · PA-23-160
- 1A2 The New Piper Aircraft Inc. · PA-18A-"150"
- 1A2 The New Piper Aircraft Inc. · PA-18AS-"150"
- 1A2 The New Piper Aircraft Inc. · PA-18S-"150"
- 1A2 The New Piper Aircraft Inc. · PA-18-"150"
- 1A6 The New Piper Aircraft Inc. · PA-22-150
- 1A6 The New Piper Aircraft Inc. · PA-22S-150
- 1A6 The New Piper Aircraft Inc. · PA-22S-160
- 1A6 The New Piper Aircraft Inc. · PA-22-160
- 2A10 The New Piper Aircraft Inc. · PA-25 (Restricted Cat.)
- 2A13 The New Piper Aircraft Inc. · PA-28-140
- 2A13 The New Piper Aircraft Inc. · PA-28S-160
- 2A13 The New Piper Aircraft Inc. · PA-28-161
- 2A13 The New Piper Aircraft Inc. · PA-28-160
- 2A13 The New Piper Aircraft Inc. · PA-28-151
- 2A13 The New Piper Aircraft Inc. · PA-28-150
- 2A8 The New Piper Aircraft Inc. · PA-25 (Normal Cat.)
+ 11 more aircraft
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 ↗