FAA · Supplemental Type Certificate
STC SA685GL
To convert a Cleveland nose wheel from Model 40-87 to Model 40-87F, install Parker Hannifin 199-121 conversion kit.
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 (6)
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗