SA4624SWOther aircraft modifications
Replace existing N1, N2 and ITT indicators with Howell autotak and autotemp indicators.
FAA holder: Howell Instruments Inc
Aircraft STC directory
Raytheon Aircraft DH.125 Series 1A/S-522 STCs
The Jun 30, 2026 FAA DRS snapshot contains 5 selected supplemental type certificates with status Current whose public applicability data names the Raytheon Aircraft DH.125 Series 1A/S-522. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
5
listed Current at snapshot
4
holder directories
4
modification categories
Jan 5, 2005
latest recorded revision
Modification demand surface
Electrical systems2
Other aircraft modifications1
Cabin and interiors1
Safety and emergency equipment1
Recently revised DH.125 Series 1A/S-522 STCs
Showing the 5 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
ST01223WIElectrical systems
Replacement of the original nickel-cadmium battery with a Concorde Valve Regulated Sealed-Lead-Acid (VRSLA) RG-125 series Battery in the Raytheon Model BH.125, DH.125 and HS.125 Airplanes in accordance with Concorde Battery Corporation Master Drawing List, Drawing No. 5-0207, Revision C, dated October 31, 2003, or later FAA approved revision.
FAA holder: Concorde Battery Corporation
SA4147SWCabin and interiors
Installation of one, two and three and four-place side facing seat.
FAA holder: Aviation Fabricators Inc
ST01324LAElectrical systems
Installation of Garrett Aviation auxiliary electrical hydraulic system.
FAA holder: AiResearch Aivation Service Co
ST01053CH-DSafety and emergency equipment
Installation of an ARTEX 110-406 NAV Emergency Locator Transmitter.
FAA holder: Garrett Aviation Services