FAA · Supplemental Type Certificate
STC SA1235SO
Replacement of the lower fuselage fuel drain cap (P/N AN929-6) with an adapter type coupling, (belly drain P/N MT-101) and an exposed quick drain valve P/N CAV-160D). (A152 SERIES AIRPLANES STARTING WITH MODEL150F (S/N 15061533) AND SUBSEQUENT)
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 (4)
Specific sections
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗