FAA-listed STC holder

Howell Instruments Inc STCs

The Jun 30, 2026 FAA DRS snapshot lists 3 selected supplemental type certificates with status Current under Howell Instruments Inc. The records span 11 public aircraft directories and 2 modification categories. This is a research directory, not a claim that any specific kit or service is currently offered.

listed Current at snapshot

aircraft directories

modification categories

Sep 12, 2012

latest recorded revision

Modification mix

Other aircraft modifications2 Engine and powerplant1

Aircraft represented

Eurocopter France AS-350B234 STCs Eurocopter France AS-350B2233 STCs Eurocopter France AS-350B1224 STCs Eurocopter France AS-350BA203 STCs Beechcraft HS.125 Series 700A76 STCs Raytheon Aircraft HS.125 Series 700A74 STCs Raytheon Aircraft BH.125 Series 400A33 STCs Raytheon Aircraft DH.125 Series 400A20 STCs Raytheon Aircraft DH.125 Series 3A12 STCs Raytheon Aircraft DH.125 Series 3A/RA10 STCs Raytheon Aircraft DH.125 Series 1A/S-5225 STCs

Recently revised records

Showing the 3 most recently revised records. Category directories provide the complete paginated discovery path.

3 displayed records.

Search every indexed record for this holder. The table below contains the recently revised records shown on this page.

Howell Instruments Inc supplemental type certificates, aircraft applicability, source status and dates
STC and modification	Aircraft / model / TC	Source status and dates	Holder and authority
SR01163NY Installation of Howell H2949-501 Engine Indicator/Monitor. Engine and powerplant View record	Eurocopter France AS-350BTC H9EU Eurocopter France AS-350B1TC H9EU Eurocopter France AS-350B2TC H9EU Eurocopter France AS-350BATC H9EU	Current at cited snapshot Revised Sep 12, 2012 Application: Dec 20, 1999	FAA holder: Howell Instruments, Inc. FAA authority record
SA4624SW Replace existing N1, N2 and ITT indicators with Howell autotak and autotemp indicators. Other aircraft modifications View record	Raytheon Aircraft BH.125 Series 400ATC A3EU Raytheon Aircraft DH.125 Series 1A/S-522TC A3EU Raytheon Aircraft DH.125 Series 3ATC A3EU Raytheon Aircraft DH.125 Series 3A/RATC A3EU Raytheon Aircraft DH.125 Series 400ATC A3EU Raytheon Aircraft HS.125 Series 700ATC A3EU	Current at cited snapshot Revised Jan 5, 2005 Application: Not listed	FAA holder: Howell Instruments Inc FAA authority record
SA4429SW Installation of Howell autotak RPM indicator. Other aircraft modifications View record	Beechcraft HS.125 Series 700ATC A3EU	Current at cited snapshot Revised Feb 9, 2004 Application: Jul 7, 1981	FAA holder: Howell Instruments Inc FAA authority record

Modification mix

Aircraft represented

Recently revised records

Installation of Howell H2949-501 Engine Indicator/Monitor.

Replace existing N1, N2 and ITT indicators with Howell autotak and autotemp indicators.

Installation of Howell autotak RPM indicator.