FAA · Supplemental Type Certificate
STC SA01294WI
Installation of the hydraulically controlled variable pitch 4-blade MTV-14-D-C-F/CF188-30g propeller. This modification would also include 414s modified with STC SA4379SW. DATA Required: (1) Installation instructions E-989 with an FAA Approval date of November 23, 2004, and (2) FAA Approved Airplane Flight Manual Supplement E-988, dated November 23, 2004, or later FAA Approved revisions to (1) or (2).
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)
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗