STC SA1396SO

Remove drain plug, Cessna Part Number AN814-3DL, from the fuel selector valve, and replace with CAV-180 (MT-1072-77) or CAV-180H-4 (CM-172-77) (*Model: C-172N Serial Nos.: 17261445, 17267585 through 17269309 (1977 Model), 17261578, 17269310 through 17271034 (1978 Model), \t(Except 17270050), 17271035 through 17272884 (1979 Model), 17270050, 17272885 through 17274009 (1980 Model))

Current Reissued Aircraft Small Airplane Rev 09/28/2020 View PDF on drs.faa.gov ↗

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 (1)

3A12 The Cessna Aircraft Company · 172N

Certification basis — 14 CFR

Specific sections

The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗