STC SA525NW

Installation of Continental IO-520-D engine and McCauley D2A34C58/90AT-4 propeller.

Current Reissued Aircraft Small Airplane Rev 04/05/2019 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 (7)

3A24 The Cessna Aircraft Company · A185F
3A24 The Cessna Aircraft Company · 185B
3A24 The Cessna Aircraft Company · 185C
3A24 The Cessna Aircraft Company · 185E
3A24 The Cessna Aircraft Company · 185D
3A24 The Cessna Aircraft Company · 185
3A24 The Cessna Aircraft Company · 185A

Certification basis — 14 CFR

Part 3
Part 21

Specific sections

§ 21.47
§ 21.120

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