FAA · Supplemental Type Certificate
STC SA629CH
Limited to installation on PA-31T, serial numbers 31T-7620018, 31T-7820039, and 31T-7520001 ONLY. Installation of Weather Modification equipment in accordance with Weather Modification conversion instructions, Document Control WMI-318MA-972, dtd 3/1/97 (serial number 31T-7620018), or Weather Modification conversion instructions, document control WMI-131MP-972, dtd 3/1/97 (serial number 31T-7820039). With flare racks installed, aircraft is to be operated in Restricted Category.
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)
Certification basis — 14 CFR
Specific sections
- Sec. 111
- Sec. 113
- Sec. 115
- Sec. 117
- Sec. 119
- Sec. 120
The STC PDF on drs.faa.gov is the authoritative document — it lists installation instructions, ICA requirements, and any limitations. Open PDF ↗