SR01858SEOther aircraft modifications
Manufacture of the Isolair, Inc., Eliminator II Model 4600-S61 Fire Fighting System.
FAA holder: Isolair Inc.
Aircraft STC directory
Sikorsky Aircraft S-61A STCs
The Jun 30, 2026 FAA DRS snapshot contains 25 selected supplemental type certificates with status Current whose public applicability data names the Sikorsky Aircraft S-61A. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
25
listed Current at snapshot
6
holder directories
9
modification categories
Feb 6, 2025
latest recorded revision
Modification demand surface
Other aircraft modifications11
Fuel systems3
Propellers2
Cargo and special mission2
Aircraft performance2
Cabin and interiors2
Aircraft structures1
Landing gear and brakes1
Rotorcraft modifications1
Recently revised S-61A STCs
Showing the 25 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
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
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
SR01552SEFuel systems
Fabrication and installation of an external aerial liquid dispensing tank.
FAA holder: Carson Helicopters Inc
SR04483CHOther aircraft modifications
Installation of NASI NREM18M Air Conditioning Module.
FAA holder: National Aircraft Service Inc. (NASI)
SR02692SEOther aircraft modifications
Installation of T58-GE-402 engines.
FAA holder: Croman Corporation
SR01051DEOther aircraft modifications
Installation of Croman Corporation Electric Heater.
FAA holder: Croman Corporation
SH5654NMCargo and special mission
Installation of Croman 10,000 lbs. cargo sling system and associated fuselage mounting hardpoints.
FAA holder: Croman Corporation
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
SR02671LAOther aircraft modifications
Installation of a shorter composite blade.
FAA holder: Carson Helicopters, Inc
SR02601SEFuel systems
Fabrication and installation of an internal fire retardant tank.
FAA holder: Croman Corporation
SR02507NYOther aircraft modifications
Installation of a 600 pound capacity Goodrich AC rescue hoist system P/N 44311-10-2.
FAA holder: Carson Helicopters, Inc
SR02077SECabin and interiors
Installation of the Observer Seat CRCS100-01.
FAA holder: Croman Corporation
SR01427SELanding gear and brakes
Installation of S-61L fixed main landing gear.
FAA holder: Croman Corporation
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
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
SR01771NYAircraft performance
Increase of Out of Ground Effect (OGE) Hover Performance.
FAA holder: Carson Helicopters Inc
SR01981SEFuel systems
Fabrication and installation of an internal fire retardant tank.
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
SR01288SEOther aircraft modifications
Fabrication of Ag-Air Systems Model 36000 Auxiliary Hydraulic System.
FAA holder: Kawak Aviation Technologies Inc
SR01738SECargo and special mission
Installation of a Mechanical Specialties, Inc. model 6111, 11,000 pound capacity cargo hook.
FAA holder: Mechanical Specialties 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