STC SA3993NM

Modification by installation of engine inlet and exhaust noise attenuation treatment including incorporation of exhaust gas internal mixers and modifications to the engine thrust reversers.

Current Reissued Aircraft Large Multi-Engine Rev 12/11/1998 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)

A3WE The Boeing Company · 727-100 Series

Certification basis — 14 CFR

Part 21

Specific sections

§ 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 ↗