STC SA4398SW

Modification of air to air heat exchanger (P/N 179450-2-2 or194110-1).

Current Reissued Aircraft Large Airplane Rev 09/10/2021 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 (2)

A6WE McDonnell Douglas Corporation · DC-9 Series
A6WE McDonnell Douglas Corporation · MD-88

Certification basis — 14 CFR

Part 1
Part 21

Specific sections

§ 21.47
§ 21.111
§ 21.113
§ 21.115
§ 21.117
§ 21.119
§ 21.120

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