# N408FS: 1966 Sikorsky S-61N

- Status: Valid registration
- Airframe: [Sikorsky S-61N](https://openairdocs.org/model/sikorsky-s-61n) (registry code 8142104, 28 seats)
- Engine: [GE CT58-140-2](https://openairdocs.org/engine/ge-ct58-140-2) (registry code 30129)
- Data sheets: [TCDS 1H15](https://openairdocs.org/tcds/1H15) (Sikorsky Aircraft), [TCDS 1E3](https://openairdocs.org/tcds/1E3) (General Electric Company) (OpenAirDocs)
- Serial number: 61361
- Year built: 1966
- Type: Rotorcraft
- Engine type: Turbo-shaft
- Airworthiness: Standard, transport
- Airworthiness date: April 14, 2010
- Certificate issued: March 14, 2019
- Expires: March 31, 2029
- Mode S code: A4CAE7
- Registered owner: [Croman Corp](https://openairdocs.org/faa-owner/CROMAN%20CORP)
- Location: [White City, OR](https://openairdocs.org/faa-place/OR/White%20City)
- Owner type: Corporation
- Owner's area on the map: 42.6128° N, 122.9275° W: Placed by OpenAirDocs at the center of ZIP code 97503, within about 5 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=408FS
- Page: https://openairdocs.org/aircraft/N408FS

From the FAA registry file of October 22, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination.

## ADs that may apply (OpenAirDocs): 67 in force

### Matched by airframe (Sikorsky S-61N)

- [AD 2026-15-17](https://openairdocs.org/ad/2026-15-17): Main Rotor Gearbox · Glacier Helicopter CH-3E, S-61A, S-61D and 12 more. Effective Sep 10, 2026
- [AD 2026-11-05](https://openairdocs.org/ad/2026-11-05): Rotorcraft flight control; Rotorcraft servo system · Carson Helicopters S-61L, SH-3H, CH-3E and 11 more. Effective Jul 9, 2026
- [AD 2023-11-07](https://openairdocs.org/ad/2023-11-07): Ground Proximity System · Airbus Helicopters 47, 206, 210 and 237 more. Effective Jun 22, 2023
- [AD 2022-05-10](https://openairdocs.org/ad/2022-05-10): Cabin Equipment/Furnishings · Airbus Helicopters AS332L, AS332L1, AS332L2 and 57 more. Effective Apr 20, 2022
- [AD 2021-05-19](https://openairdocs.org/ad/2021-05-19): Tail Rotor Control System · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective May 7, 2021
- [AD 2013-06-51](https://openairdocs.org/ad/2013-06-51): Equipment/Furnishings · Agusta A109, A109A, A109A II and 43 more. Effective Jul 15, 2013
- [AD 2013-05-17](https://openairdocs.org/ad/2013-05-17): Aircraft Fuel Filter/Strainer · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Apr 26, 2013
- [AD 2007-01-05](https://openairdocs.org/ad/2007-01-05): Main gearbox input left and right freewheel unit (IFWU) assembly · Sikorsky S-61L, S-61N, S-61NM and 1 more. Effective Feb 14, 2007
- [AD 2004-15-22](https://openairdocs.org/ad/2004-15-22): Bearing chip detector · Sikorsky S-61L, S-61N, S-61NM and 1 more. Effective Sep 7, 2004
- [AD 2002-20-05](https://openairdocs.org/ad/2002-20-05): Rescue hoists · Agusta A109, A109A, A109A II and 31 more. Effective Nov 7, 2002
- [AD 2000-13-06](https://openairdocs.org/ad/2000-13-06): Web Fittings · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Jul 18, 2000
- [AD 98-26-02](https://openairdocs.org/ad/98-26-02): Shaft · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Jan 20, 1999
- [AD 97-19-06](https://openairdocs.org/ad/97-19-06): Blade Trailing Edge Pocket Assemblies · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Oct 6, 1997
- [AD 91-12-01](https://openairdocs.org/ad/91-12-01): Sleeve & Spindle Assemblies · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Jul 8, 1991
- [AD 90-01-04](https://openairdocs.org/ad/90-01-04): Main Rotor Hub Upper Plate · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Feb 5, 1990
- [AD 89-04-01 R3](https://openairdocs.org/ad/89-04-01-R3): Truss Tube Assemblies · Sikorsky S-61N and S-61NM. Effective Feb 5, 1990
- [AD 89-07-09](https://openairdocs.org/ad/89-07-09): Main Rotor Gearbox · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Apr 20, 1989
- [AD 85-18-05 R2](https://openairdocs.org/ad/85-18-05-R2): Main Rotor Blades · Sikorsky S-61A, S-61L, S-61N and 3 more. Effective Feb 8, 1989
- [AD 87-15-11](https://openairdocs.org/ad/87-15-11): Gearbox Brackets · Sikorsky S-61A, S-61L, S-61N and 3 more. Effective Aug 10, 1987
- [AD 86-23-08](https://openairdocs.org/ad/86-23-08): Main Rotor Hub Lower Plate · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Apr 21, 1987
- [AD 84-25-01](https://openairdocs.org/ad/84-25-01): Main Gearbox Inspection · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Jan 19, 1985
- [AD 84-11-03](https://openairdocs.org/ad/84-11-03): Possible Flange Failure · Sikorsky S-61A, S-61L and S-61N. Effective Jun 6, 1984
- [AD 84-01-51](https://openairdocs.org/ad/84-01-51): Rotary Wing Head Shaft Nut · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Mar 27, 1984
- [AD 74-20-07 R5](https://openairdocs.org/ad/74-20-07-R5): Main Rotor Blades · Sikorsky S-61A, S-61L, S-61N and 3 more. Effective Dec 30, 1983
- [AD 78-20-05 R4](https://openairdocs.org/ad/78-20-05-R4): Main Rotor Spindles · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective May 25, 1983
- [AD 80-17-07](https://openairdocs.org/ad/80-17-07): Horizontal Hinge Pins · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Aug 15, 1980
- [AD 78-05-07](https://openairdocs.org/ad/78-05-07): Main Landing Gear · Sikorsky S-61N. Effective Apr 13, 1978
- [AD 74-20-09](https://openairdocs.org/ad/74-20-09): Main Rotor Blades · Sikorsky S-61A, S-61L, S-61N and 2 more. Effective Feb 25, 1977
- [AD 76-06-01](https://openairdocs.org/ad/76-06-01): Hydraulic Pumps · Erickson Air-Crane S-64A, S-64E, S-64F and 12 more. Effective Mar 24, 1976
- [AD 76-03-02](https://openairdocs.org/ad/76-03-02): Fractures in Barrel Nuts · Sikorsky S-61L, S-61N, S-61NM and 1 more. Effective Feb 17, 1976
- [AD 75-26-10](https://openairdocs.org/ad/75-26-10): Component Replacement · Sikorsky S-61L, S-61N and S-61NM. Effective Jan 2, 1976
- [AD 68-19-07](https://openairdocs.org/ad/68-19-07): Rotor Blade Spindles · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Dec 23, 1975
- [AD 75-17-33](https://openairdocs.org/ad/75-17-33): Baggage Doors · Sikorsky S-61L, S-61N and S-61NM. Effective Oct 3, 1975
- [AD 75-12-01](https://openairdocs.org/ad/75-12-01): Main Rotor Blades · Sikorsky S-61L, S-61N, S-61NM and 1 more. Effective Jun 12, 1975
- [AD 74-25-05](https://openairdocs.org/ad/74-25-05): Main Rotor Blades · Sikorsky S-61L, S-61N, S-61NM and 1 more. Effective Nov 6, 1974
- [AD 74-25-06](https://openairdocs.org/ad/74-25-06): Takeoff Gross Weight Limitation · Sikorsky S-61L, S-61N and S-61NM. Effective Oct 16, 1974
- [AD 72-25-04](https://openairdocs.org/ad/72-25-04): Loss of Main Rotor Control · Sikorsky S-61A, S-61D, S-61L and 3 more. Effective Dec 15, 1972
- [AD 72-16-06](https://openairdocs.org/ad/72-16-06): Electrical Feeder Wire Gage · Sikorsky S-61A, S-61L, S-61N and 1 more. Effective Aug 10, 1972
- [AD 72-03-01](https://openairdocs.org/ad/72-03-01): Alum. Forgings Flight Control System · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Feb 1, 1972
- [AD 71-21-03](https://openairdocs.org/ad/71-21-03): Link in Servo Valve Input Linkage · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Oct 7, 1971
- [AD 71-05-01](https://openairdocs.org/ad/71-05-01): Main Landing Gear Axle · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Feb 23, 1971
- [AD 68-20-08](https://openairdocs.org/ad/68-20-08): Functional Test of AFCS · Sikorsky S-61A, S-61L and S-61N. Effective Jan 14, 1971
- [AD 70-15-01](https://openairdocs.org/ad/70-15-01): Cabin Heater Blower · Sikorsky S-61A, S-61L, S-61N and 1 more. Effective Jul 22, 1970
- [AD 70-09-03](https://openairdocs.org/ad/70-09-03): Tail Gear Box Pitch Beams · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective May 8, 1970
- [AD 70-08-03](https://openairdocs.org/ad/70-08-03): Heater Inlet Check Valve · Sikorsky S-61A, S-61L, S-61N and 1 more. Effective Mar 17, 1970
- [AD 68-21-06](https://openairdocs.org/ad/68-21-06): Deactivate AFCS · Sikorsky S-61A, S-61L and S-61N. Effective Oct 24, 1968
- [AD 67-29-05](https://openairdocs.org/ad/67-29-05): Rotary Wing Hub Hinge Pins · Sikorsky S-61A, S-61D, S-61E and 5 more. Effective Oct 30, 1967
- [AD 66-19-04](https://openairdocs.org/ad/66-19-04): Tail Rotor Blades · Sikorsky S-58A, S-58B, S-58BT and 20 more. Effective Aug 14, 1966
- [AD 65-08-02](https://openairdocs.org/ad/65-08-02): Main Rotor Blades · Orlando Helicopter Airways HRS-1/CH-19, HRS-3/H-19B, S-55 and 11 more. Effective Apr 9, 1965
- [AD 85-15-05](https://openairdocs.org/ad/85-15-05): Main Rotor Horn Eyebolt/Eyebolt Assembly · Sikorsky S-61L, S-61N and S-61NM

### Matched by engine (GE CT58-140-2)

- [AD 2015-20-09](https://openairdocs.org/ad/2015-20-09): Life-limited rotating parts · General Electric CT58-100-2, CT58-110-1, CT58-110-2 and 2 more. Effective Nov 18, 2015
- [AD 2005-04-10](https://openairdocs.org/ad/2005-04-10): Stage 1 compressor disks · General Electric T58-GE-100, T58-GE-10, T58-GE-5 and 2 more. Effective Mar 29, 2005
- [AD 2004-04-06](https://openairdocs.org/ad/2004-04-06): Fuel flow divider assemblies · General Electric T58-GE-402, T58-GE-100, T58-GE-10 and 8 more. Effective Mar 9, 2004
- [AD 2001-12-07](https://openairdocs.org/ad/2001-12-07): Fuel Flow Divider Assemblies · General Electric T58-GE-402, T58-GE-100, T58-GE-10 and 4 more. Effective Jul 2, 2001
- [AD 97-21-08](https://openairdocs.org/ad/97-21-08): Stage 1 forward cooling plate · General Electric T58-GE-100, T58-GE-10, T58-GE-8F and 6 more. Effective Dec 19, 1997
- [AD 97-19-17](https://openairdocs.org/ad/97-19-17): Critical rotating parts · General Electric T58-GE-100, T58-GE-10, T58-GE-5 and 6 more. Effective Nov 28, 1997
- [AD 94-07-05](https://openairdocs.org/ad/94-07-05): Turbine Wheels · General Electric CT58-110-1, CT58-110-2, CT58-140-1 and 1 more. Effective Apr 19, 1994
- [AD 81-18-03](https://openairdocs.org/ad/81-18-03): Fuel Controls · General Electric CT58-100-2, CT58-110-1, CT58-110-2 and 2 more. Effective Sep 17, 1981
- [AD 81-02-02](https://openairdocs.org/ad/81-02-02): Stage One Turbine Wheels · General Electric CT58-100-2, CT58-110-1, CT58-110-2 and 2 more. Effective Feb 2, 1981
- [AD 78-26-08](https://openairdocs.org/ad/78-26-08): Lube Pump Drive Shaft · General Electric CT58-100-2, CT58-110-1, CT58-110-2 and 2 more. Effective Dec 19, 1978
- [AD 67-01-02](https://openairdocs.org/ad/67-01-02): Rotor Discs · General Electric CT58-100-1, T58-GE-5, T58-GE-1 and 5 more. Effective Aug 24, 1976
- [AD 76-13-02](https://openairdocs.org/ad/76-13-02): Oil Cooler-To-Fuel Filter Hose · General Electric CT58-100-2, CT58-110-1, CT58-110-2 and 2 more. Effective Jul 6, 1976
- [AD 74-25-01](https://openairdocs.org/ad/74-25-01): Fuel System Hose · General Electric CT58-140-1 and CT58-140-2. Effective Dec 10, 1974
- [AD 69-17-03](https://openairdocs.org/ad/69-17-03): First and Second Stage Turbine Rotor Discs · General Electric T58-GE-5, T58-GE-1, CT58-100-2 and 4 more. Effective Aug 27, 1969

### Historical (superseded or no longer in force)

- [AD 2021-23-13](https://openairdocs.org/ad/2021-23-13) (historical): Ground Proximity System · Airbus Helicopters K-225, K-190A, K-240 and 237 more. Effective Dec 9, 2021
- [AD 2015-20-12](https://openairdocs.org/ad/2015-20-12) (historical): Main Rotor Gearbox · Carson Helicopters SH-3H, SH-3H, CH-3E and 13 more. Effective Nov 24, 2015
- [AD 97-10-04](https://openairdocs.org/ad/97-10-04) (historical): Blade Trailing Edge Pocket Assemblies · Sikorsky S-61A, S-61D, S-61E and 5 more
- [AD 2008-22-16](https://openairdocs.org/ad/2008-22-16) (historical): Repetitive heavy lift (RHL) · General Electric CT58-100-2, CT58-110-1, CT58-110-2 and 2 more. Effective Dec 1, 2008
- [AD 2001-18-06](https://openairdocs.org/ad/2001-18-06) (historical): Engine Life-limited Rotating Parts · General Electric CT58-100-2, CT58-110-1, CT58-110-2 and 2 more. Effective Oct 18, 2001
- [AD 69-23-02](https://openairdocs.org/ad/69-23-02) (historical): Stage 2 Compressor Rotor Disc Shafts · General Electric CT58-100-2, CT58-110-1, CT58-110-2 and 2 more. Effective Oct 15, 1970
- [AD 79-23-04](https://openairdocs.org/ad/79-23-04) (historical): Turboshaft Engines Rotating Components · General Electric CT58-100-2, CT58-110-1, CT58-110-2 and 2 more

All 74: https://openairdocs.org/aircraft/N408FS/ads.md

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N408FS.

## FAA accident and incident reports

None matched to N408FS.

## Service difficulty reports (2)

As reported by operators and repair stations. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

- [SDR 39LA20160414154](https://openairdocs.org/sdr/39LA20160414154), Apr 14, 2016: HYDRAULIC LINE. BLOWN. AFTER TAKEOFF & DURING CLIMB OUT, THE PRIMARY HYDRAULICS BEGAN TO FLUCTUATE. THE MASTER CAUTION & PRIMARY HYD LIGHT ILLUMINATED. EMERGENCY PROCEDURES PERFORMED.
- [SDR 39LA2013032900004](https://openairdocs.org/sdr/39LA2013032900004), Mar 27, 2013: UNKNOWN. SMOKE. WHILE IN FLIGHT, COCKPIT FILLED WITH SMOKE FROM RT SIDE. INVERTER CAUTION WARNING LIGHT ILLUMINATED. PERFORMED CHECKLIST ITEMS FOR ELECTRICAL FIRE IN-FLIGHT AND

## STCs that may be installed (OpenAirDocs) (107, first 50)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the airframe (Sikorsky S-61N)

- [STC SR04465NY](https://openairdocs.org/stc/SR04465NY): Installation of the iPad Mount. Avio Design Group Inc
- [STC SR01858SE](https://openairdocs.org/stc/SR01858SE): Manufacture of the Isolair, Inc., Eliminator II Model 4600-S61 Fire Fighting System. Isolair Inc
- [STC SR00218IB](https://openairdocs.org/stc/SR00218IB): Installation of the Cockpit Door. Croman Corporation
- [STC SR00220IB](https://openairdocs.org/stc/SR00220IB): Installation of Replacement Avionics Shelves. Croman Corporation
- [STC SR00283SE](https://openairdocs.org/stc/SR00283SE): Removal of a 50 inch section from the forward fuselage between stations 110 and 160 and reinstallation of forward cabin with associated fabricated parts. Croman Corporation
- [STC SR00427SE](https://openairdocs.org/stc/SR00427SE): Fabrication and installation of a Helipro Model H9661N01-01, -03, -05, -07, -51, -53, -55, -57, -59 or -61 logging utility system. Croman Corporation
- [STC SR00814SE](https://openairdocs.org/stc/SR00814SE): Fabrication of reinforcement kit - aft fuselage station 493. For model S61A, applies to S/N 61094. For model S61NM, applies to S/N 66454. Croman Corporation
- [STC SR01264SE](https://openairdocs.org/stc/SR01264SE): Fabrication of Helipro replacement windshields. Croman Corporation
- [STC SH3319NM](https://openairdocs.org/stc/SH3319NM): Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system,. Precise Flight Inc
- [STC SR02279AK](https://openairdocs.org/stc/SR02279AK): 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. Croman Corporation
- [STC SR09236RC](https://openairdocs.org/stc/SR09236RC): Installation of a Modular Harness. Croman Corporation
- [STC SR04501CH](https://openairdocs.org/stc/SR04501CH): The certification of various configurations of cockpit side windows. CHI Aviation
- [STC SR01127SE](https://openairdocs.org/stc/SR01127SE): 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. Park Technologies, LLC
- [STC SR00039IB](https://openairdocs.org/stc/SR00039IB): Installation of Coulson Aircrane Limited (CAL) Hoist Replacement Parts. Coulson Aircrane Ltd
- [STC SR09490RC](https://openairdocs.org/stc/SR09490RC): Installation of nine passenger seat configuration. McHenry Priestley Aviation LLC
- [STC SR00681SE](https://openairdocs.org/stc/SR00681SE): Fabrication of Onboard Systems Model 200-243-00 or 200-243-01 Cargo Hook Load Weigh System. Onboard Systems International
- [STC SR01552SE](https://openairdocs.org/stc/SR01552SE): Fabrication and installation of an external aerial liquid dispensing tank. Carson Helicopters Inc
- [STC SR04607NY](https://openairdocs.org/stc/SR04607NY): Installation of Garmin GTX Transponder System. Maxcraft Avionics Ltd
- [STC SR04609NY](https://openairdocs.org/stc/SR04609NY): Installation of Garmin HTAWS (Helicopter Terrain Awareness Warning System). Maxcraft Avionics Ltd
- [STC SR04483CH](https://openairdocs.org/stc/SR04483CH): Installation of NASI NREM18M Air Conditioning Module. National Aircraft Service Inc. (NASI)
- [STC SR00925DE](https://openairdocs.org/stc/SR00925DE): Installation of Garmin GTX 335/335R and GTX345/345R transponders to provide ADS-B Out and In functionality. Peregrine
- [STC SR04401NY](https://openairdocs.org/stc/SR04401NY): Increase of Out of Ground Effect (OGE) Hover Performance. Carson Helicopters Inc
- [STC SR04122NY](https://openairdocs.org/stc/SR04122NY): The Installation of Carson Helicopters, Inc. Composite Tail Rotor Blade and Pitch Sleeve, part number 428-600-1,. Carson Helicopters Inc
- [STC SR02596SE](https://openairdocs.org/stc/SR02596SE): Installation of Olympic Aero Services, Inc. Additional Telemetry Unit (ATU). OLYMPIC AERO SERVICES INC
- [STC SR02487NY](https://openairdocs.org/stc/SR02487NY): Increased Category A Performance for the Sikorsky S-61L, S-61N and S-61NM Helicopters. Carson Helicopters, Inc
- [STC SR02583SE](https://openairdocs.org/stc/SR02583SE): Installation of a 9 passenger seat configuration for side-facing seats. Croman Corporation
- [STC SR02507NY](https://openairdocs.org/stc/SR02507NY): Installation of a 600 pound capacity Goodrich AC rescue hoist system P/N 44311-10-2. Carson Helicopters, Inc
- [STC SR03664NY](https://openairdocs.org/stc/SR03664NY): Installation of the Engine Inlet Barrier Filter System (IBFS). Coulson Aircrane Ltd
- [STC SR02267SE](https://openairdocs.org/stc/SR02267SE): Fabrication of replacement transmission fittings. Croman Corporation
- [STC SR02394AK](https://openairdocs.org/stc/SR02394AK): Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system. Seaplanes North LLC
- [STC SR03310CH](https://openairdocs.org/stc/SR03310CH): Installation of NASI Air Conditioning Module. National Aircraft Service Inc
- [STC SH5125NM](https://openairdocs.org/stc/SH5125NM): Installation of Croman 10,000 lbs. cargo sling system and associated fuselage mounting hardpoints. Croman Corporation
- [STC SR02501LA](https://openairdocs.org/stc/SR02501LA): Removal of the Bendix 30E20-11-C 300 Amp Starter Generator and installation of the AMETEK Aerospace MG105A-1, 300 Amp Starter Generator. Carson Helicopters, Inc
- [STC SR01426SE](https://openairdocs.org/stc/SR01426SE): Fabrication and installation of components for a left seat pilot-in-command operation. Croman Corporation
- [STC SR01480SE](https://openairdocs.org/stc/SR01480SE): Fabrication and installation of an external firefighting tank. Carson Helicopters, Inc
- [STC SR02327AK](https://openairdocs.org/stc/SR02327AK): Manufacture side-facing seat mounting structure. Carson Helicopters, Inc
- [STC SR00319SE](https://openairdocs.org/stc/SR00319SE): Modification of Part Number S6137-23009-6 main transmission rear cover per. Croman Corporation
- [STC SR01534SE](https://openairdocs.org/stc/SR01534SE): Installation of the transmission input modification to the main gear box. Croman Corporation
- [STC SR02248SE](https://openairdocs.org/stc/SR02248SE): Installation of a Supplemental Lighting System. Aviation Specialties Unlimited Inc
- [STC SR01853NY](https://openairdocs.org/stc/SR01853NY): Installation of a SkyTrac ISAT-100 / ISAT-200 Airborne Position/Data Communicator. SkyTrac Systems Ltd
- [STC SR00465SE](https://openairdocs.org/stc/SR00465SE): Installation of a Mechanical Specialties Model 611 cargo hook. Mechanical Specialties Inc
- [STC SR09232RC](https://openairdocs.org/stc/SR09232RC): Installation of a ground inverter. Vector Aerospace Helicopter Services USA Inc
- [STC SR09233RC](https://openairdocs.org/stc/SR09233RC): Installation of a Solid State Voltage Regulator. Vector Aerospace Helicopter Services USA Inc
- [STC SR02190SE](https://openairdocs.org/stc/SR02190SE): Installation of steel transmission fitting fabricated in accordance with Croman Drawing S-6120-62113-CRO41, Revision D, dated January 8, 1982, or later Federal Aviation Administration (FAA) approved revision; installed in accordance with Croman Installation Instructions S-6120-62113-CRO41-Inst, Revision IR, dated August 10, 2011, or later FAA- approved revision. Croman Corporation
- [STC SR01771NY](https://openairdocs.org/stc/SR01771NY): Increase of Out of Ground Effect (OGE) Hover Performance. Carson Helicopters Inc
- [STC SR02335AK](https://openairdocs.org/stc/SR02335AK): Installation of two or three tank fuel quantity indicating systems when installed. Carson Helicopters, Inc
- [STC SR02336AK](https://openairdocs.org/stc/SR02336AK): 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. Carson Helicopters, Inc
- [STC SR02999NY](https://openairdocs.org/stc/SR02999NY): Installation of Auxiliary External Torque Gauge and External Load Meter in accordance with VIH Aerospace Inc., Master Document List VS61-0715J-MDL, Revision A, Dated January 24, 2011, approved by Transport Canada Civil Aviation (TCAA) on February 15, 2011, or later TCCA approved revisions. VIH Aerospace Inc
- [STC SR02087SE](https://openairdocs.org/stc/SR02087SE): Limit the standard passenger seating configuration to 19 or less on the Sikorsky S-61N rotorcraft. Croman Corporation
- [STC SR02832CH](https://openairdocs.org/stc/SR02832CH): Installation of Brownlee seat track and SICMA TSO C39b or C127a Seats. VIH Cougar Helicopters Inc

All 107: https://openairdocs.org/aircraft/N408FS/stcs.md

## Related

- Other Sikorsky S-61N aircraft: https://openairdocs.org/model/sikorsky-s-61n/aircraft.md
- The GE CT58-140-2 engine: https://openairdocs.org/engine/ge-ct58-140-2.md

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