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
Aircraft STC directory
Sikorsky Aircraft S-61NM STCs
The Jun 30, 2026 FAA DRS snapshot contains 22 selected supplemental type certificates with status Current whose public applicability data names the Sikorsky Aircraft S-61NM. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
22
listed Current at snapshot
5
holder directories
8
modification categories
Mar 21, 2024
latest recorded revision
Modification demand surface
Other aircraft modifications9
Avionics3
Aircraft performance3
Propellers2
Electrical systems2
Aircraft structures1
Cabin and interiors1
Rotorcraft modifications1
Recently revised S-61NM STCs
Showing the 22 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
SR01264SEOther aircraft modifications
Fabrication of Helipro replacement windshields.
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
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
SR04401NYAircraft performance
Increase of Out of Ground Effect (OGE) Hover Performance.
FAA holder: Carson Helicopters Inc
SR04122NYPropellers
The Installation of Carson Helicopters, Inc. Composite Tail Rotor Blade and Pitch Sleeve, part number 428-600-1,.
FAA holder: Carson Helicopters Inc
SR02487NYAircraft performance
Increased Category A Performance for the Sikorsky S-61L, S-61N and S-61NM Helicopters.
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
SR01585NYRotorcraft modifications
Installation of Carson Helicopters, Inc. composite main rotor blades, P/N 163-101-1.
FAA holder: Carson Helicopters 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
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
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
SR02373ATOther aircraft modifications
Manufacture of a titanium transmission support fitting assembly.
FAA holder: Clayton International Inc.