SR04465NYOther aircraft modifications
Installation of the iPad Mount.
FAA holder: Avio Design Group Inc
Aircraft STC directory
Sikorsky Aircraft S-61L STCs
The Jun 30, 2026 FAA DRS snapshot contains 51 selected supplemental type certificates with status Current whose public applicability data names the Sikorsky Aircraft S-61L. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
51
listed Current at snapshot
15
holder directories
13
modification categories
Sep 30, 2025
latest recorded revision
Modification demand surface
Other aircraft modifications22
Avionics10
Aircraft structures3
Cabin and interiors3
Electrical systems3
Aircraft performance2
Rotorcraft modifications2
Propellers1
Safety and emergency equipment1
Fuel systems1
Engine and powerplant1
Aircraft connectivity1
Cargo and special mission1
Recorded holders
Croman Corporation11Carson Helicopters, Inc10VIH Aerospace Inc5Acrohelipro Global Services Inc5Maxcraft Avionics Ltd.3Vector Aerospace Helicopter Services USA Inc.2Coulson Aircrane Ltd.2Avio Design Group Inc1Peregrine1National Aircraft Service Inc1SkyTrac Systems Ltd.1Cougar Helicopters Inc.1Kawak Aviation Technologies Inc1Acrohelipro Global Services USA Inc1Canadian Helicopters Limited1
Recently revised S-61L STCs
Showing the 51 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
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SR00283SECabin and interiors
Removal of a 50 inch section from the forward fuselage between stations 110 and 160 and reinstallation of forward cabin with associated fabricated parts.
FAA holder: Croman Corporation
SR00814SEAircraft structures
Fabrication of reinforcement kit - aft fuselage station 493. For model S61A, applies to S/N 61094. For model S61NM, applies to S/N 66454.
FAA holder: Croman Corporation
SR01264SEOther aircraft modifications
Fabrication of Helipro replacement windshields.
FAA holder: Croman Corporation
SR09236RCOther aircraft modifications
Installation of a Modular Harness.
FAA holder: Croman Corporation
SR04501CHOther aircraft modifications
The certification of various configurations of cockpit side windows.
FAA holder: CHI Aviation
SR01127SEPropellers
Modification of main rotor blade part number 61170-20201 in accordance with Master Drawing List RR 9633-08, Revision A, dated September 17, 2002, or later FAA approved revision. Retirement life for the modified main rotor blade, part number RR-61170-20201 is 21,200 total time in service.
FAA holder: Park Technologies, LLC
SR09490RCCabin and interiors
Installation of nine passenger seat configuration.
FAA holder: McHenry Priestley Aviation LLC
SR04609NYSafety and emergency equipment
Installation of Garmin HTAWS (Helicopter Terrain Awareness Warning System).
FAA holder: Maxcraft Avionics Ltd.
SR04483CHOther aircraft modifications
Installation of NASI NREM18M Air Conditioning Module.
FAA holder: National Aircraft Service Inc. (NASI)
SR00925DEAvionics
Installation of Garmin GTX 335/335R and GTX345/345R transponders to provide ADS-B Out and In functionality.
FAA holder: Peregrine
SR02487NYAircraft performance
Increased Category A Performance for the Sikorsky S-61L, S-61N and S-61NM Helicopters.
FAA holder: Carson Helicopters, Inc
SR03324NYRotorcraft modifications
One Helicopter-only conversion of Sikorsky Model S-61L S/N 61428 to an S-61N configuration.
FAA holder: Carson Helicopters, Inc
SR02507NYOther aircraft modifications
Installation of a 600 pound capacity Goodrich AC rescue hoist system P/N 44311-10-2.
FAA holder: Carson Helicopters, Inc
SR02267SEOther aircraft modifications
Fabrication of replacement transmission fittings.
FAA holder: Croman Corporation
SR03310CHOther aircraft modifications
Installation of NASI Air Conditioning Module.
FAA holder: National Aircraft Service Inc
SR02501LAElectrical systems
Removal of the Bendix 30E20-11-C 300 Amp Starter Generator and installation of the AMETEK Aerospace MG105A-1, 300 Amp Starter Generator.
FAA holder: Carson Helicopters, Inc
SR01426SECabin and interiors
Fabrication and installation of components for a left seat pilot-in-command operation.
FAA holder: Croman Corporation
SR00319SEOther aircraft modifications
Modification of Part Number S6137-23009-6 main transmission rear cover per.
FAA holder: Croman Corporation
SR01534SEOther aircraft modifications
Installation of the transmission input modification to the main gear box.
FAA holder: Croman Corporation
SR01853NYOther aircraft modifications
Installation of a SkyTrac ISAT-100 / ISAT-200 Airborne Position/Data Communicator.
FAA holder: SkyTrac Systems Ltd.
SR09232RCElectrical systems
Installation of a ground inverter.
FAA holder: Vector Aerospace Helicopter Services USA Inc.
SR09233RCOther aircraft modifications
Installation of a Solid State Voltage Regulator.
FAA holder: Vector Aerospace Helicopter Services USA Inc.
SR02335AKFuel systems
Installation of two or three tank fuel quantity indicating systems when installed.
FAA holder: Carson Helicopters, Inc
SR02336AKAvionics
Installation of an Integrated Cockpit Display System (ICDS) with an Attitude and Heading Reference System (AHRS) for Dual Pilot Instrument Flight Rules Category A and B operation in accordance with Vector Aerospace Helicopter Services Inc. Master Drawing List , HP 61-34-33-105, Revision A, dated February 28, 2011, or later FAA approved revision.
FAA holder: Carson Helicopters, Inc
SR01585NYRotorcraft modifications
Installation of Carson Helicopters, Inc. composite main rotor blades, P/N 163-101-1.
FAA holder: Carson Helicopters Inc
SR02672NYAvionics
Installation of the dual Garmin GNS-430 COM/NAV/GPS, dual GAD-42 Adapter, GTX 330 Transponder, Skywatch 497 Traffic Advisory, Artex 406HM ELT, and Garmin GMX-200 MFD.
FAA holder: VIH Aerospace Inc
SR02382NYAircraft performance
Increase of Out of Ground Effect (OGE) and In Ground Effect (IGE) Hover Performance for the Sikorsky S-61L, S-61N and S-61NM Helicopters.
FAA holder: Carson Helicopters Inc
SR02522NYOther aircraft modifications
Installation of a Collective Friction Lock.
FAA holder: Cougar Helicopters Inc.
SR02471NYEngine and powerplant
Installation of Diamond-J 61000-(103, 104) Power Turbine Inlet Temperature T5 Indicators (TIT).
FAA holder: VIH Aerospace Inc
SR02460NYOther aircraft modifications
Installation of Honeywell AR-Series CVR.
FAA holder: Maxcraft Avionics Ltd.
SR01288SEOther aircraft modifications
Fabrication of Ag-Air Systems Model 36000 Auxiliary Hydraulic System.
FAA holder: Kawak Aviation Technologies Inc
SA02279AKAvionics
Installation of dual Rockwell Collins FDS 2000 flight displays, dual AHS 3000 attitude and heading reference systems, dual Garmin GNS 530 navigation systems and supporting avionics equipment .
FAA holder: Acrohelipro Global Services USA Inc
SR09448RCElectrical systems
Installation of Concorde Battery Corporation Model RG-3BOE/44 Valve Regulated Sealed Lead Acid Battery.
FAA holder: Carson Helicopters Inc
SR09231RCOther aircraft modifications
Installation of Smiths Industries Cockpit Voice Recorder in accordance with Master Drawing List ACRO 61-23-00-103, Rev NC, dated April 6, 1999, or later FAA approved revision.
FAA holder: Acrohelipro Global Services Inc
SR09234RCAvionics
Installation of Navigation Switching and GPS System in accordance with Master Drawing List ACRO 61-34-00-103, Rev A dated February 21, 2000, or later FAA approved revision.
FAA holder: Acrohelipro Global Services Inc
SR09235RCOther aircraft modifications
Installation of Litton T5PTIT Indicators in accordance with Master Drawing List ACRO 61-77-20-101, Rev. NC dated April 06, 1999, or later FAA approved revision.
FAA holder: Acrohelipro Global Services Inc
SR09237RCOther aircraft modifications
Installation of SFENA 904 Standby Attitude Indicator in accordance with Master Drawing List ACRO 61-34-00-101, Rev. NC dated January 28, 1999, or later FAA approved revision.
FAA holder: Acrohelipro Global Services Inc
SR09238RCAvionics
Installation of NAV/COM avionics package in accordance with Master Drawing List ACRO 61-23-00-101, Rev. B, dated February 21, 2000, or later FAA approved revision.
FAA holder: Acrohelipro Global Services Inc
SR02057NYOther aircraft modifications
Upgrade of the S6135-20600 series main gearbox by replacing input free-wheeling units in accordance with Carson drawing. IFWU INSTL Carson S-61 No. CHI-R-001, no revision, dated 12-15-04 and Carson Installation Instructions Report CHI-R-INSTALL, no revision, dated 12-14-04.
FAA holder: Carson Helicopters, Inc
SR01653NYOther aircraft modifications
Installation of replacement seats per Amtech Aeronautical Limited Modification Data Summary MDS334201 latest Transport Canada approved revision.
FAA holder: Coulson Aircrane Ltd.
SR01538NYCargo and special mission
Installation of cargo door entry/exit steps.
FAA holder: Coulson Aircrane Ltd.
SR01401NYOther aircraft modifications
Installation of Chadwick-Helmuth HUMS System using Drawing No. CHS61-31-006, dtd 8/22/01.
FAA holder: Canadian Helicopters Limited
SR02373ATOther aircraft modifications
Manufacture of a titanium transmission support fitting assembly.
FAA holder: Clayton International Inc.