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). View PDF on drs.faa.gov ↗

The STC PDF is authoritative: installation instructions, ICA requirements and limitations.