FAA · Supplemental Type Certificate
STC SA11840BO
Installation of T3 Tailwheel Suspension Systems suspension
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 (22)
- 5A5 Regal Air Inc. · 305A
- A-799 Textron Aviation Inc. · 170
- A-799 Textron Aviation Inc. · 170B
- A-799 Textron Aviation Inc. · 170A
- 1A2 Piper Aircraft Inc. · PA-18
- 1A2 Piper Aircraft Inc. · PA-18S
- 1A2 Piper Aircraft Inc. · PA-18-105 (Special)
- 1A2 Piper Aircraft Inc. · PA-18S-105 (Special)
- 1A2 Piper Aircraft Inc. · PA-18A
- 1A2 Piper Aircraft Inc. · PA-18-125 (Army L-21A)
- 1A2 Piper Aircraft Inc. · PA-18S-125
- 1A2 Piper Aircraft Inc. · PA-18AS-125
- 1A2 Piper Aircraft Inc. · PA-18-135 (Army L-21B)
- 1A2 Piper Aircraft Inc. · PA-18A-135
- 1A2 Piper Aircraft Inc. · PA-18S-135
- 1A2 Piper Aircraft Inc. · PA-18AS-135
- 1A2 Piper Aircraft Inc. · PA-18-150
- 1A2 Piper Aircraft Inc. · PA-18A-150
- 1A2 Piper Aircraft Inc. · PA-18S-150
- 1A2 Piper Aircraft Inc. · PA-18AS-150
- 1A2 Piper Aircraft Inc. · PA-19 (Army L-18C)
- 1A2 Piper Aircraft Inc. · PA-19S
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗