FAA · Supplemental Type Certificate
STC SA8408SW
Replace the o-ring seals in the landing gear lower strut seal.
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 (17)
- 2A4 Twin Commander Aircraft Corporation · 560-F
- 2A4 Twin Commander Aircraft Corporation · 680-FL
- 2A4 Twin Commander Aircraft Corporation · 680-FL(P)
- 2A4 Twin Commander Aircraft Corporation · 680-F(P)
- 2A4 Twin Commander Aircraft Corporation · 680-T
- 2A4 Twin Commander Aircraft Corporation · 680-V
- 2A4 Twin Commander Aircraft Corporation · 680-W
- 2A4 Twin Commander Aircraft Corporation · 681
- 2A4 Twin Commander Aircraft Corporation · 685
- 2A4 Twin Commander Aircraft Corporation · 690
- 2A4 Twin Commander Aircraft Corporation · 690A
- 2A4 Twin Commander Aircraft Corporation · 690B
- 2A4 Twin Commander Aircraft Corporation · 690C
- 2A4 Twin Commander Aircraft Corporation · 690D
- 2A4 Twin Commander Aircraft Corporation · 695
- 2A4 Twin Commander Aircraft Corporation · 695A
- 2A4 Twin Commander Aircraft Corporation · 695B
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗