# N4263A: 1966 Sikorsky S-61R - Status: Valid registration - Airframe: [Sikorsky S-61R](https://openairdocs.org/model/sikorsky-s-61r) (registry code 8142106, 28 seats) - Engine: [GE CT58-140-1](https://openairdocs.org/engine/ge-ct58-140-1) (registry code 30128) - Data sheets: [TCDS 1H15](https://openairdocs.org/tcds/1H15) (Sikorsky Aircraft), [TCDS 1E3](https://openairdocs.org/tcds/1E3) (General Electric Company) (OpenAirDocs) - Serial number: 61551 - Year built: 1966 - Type: Rotorcraft - Engine type: Turbo-shaft - Airworthiness: Standard, transport - Airworthiness date: May 5, 2018 - Certificate issued: January 18, 2025 - Expires: January 31, 2032 - Mode S code: A514AB - 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=4263A - Page: https://openairdocs.org/aircraft/N4263A From the FAA registry file of October 24, 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): 57 in force ### Matched by airframe (Sikorsky S-61R) - [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 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 89-07-09](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 84-01-51](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 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 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 75-12-01](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 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 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 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 79-12-10](https://openairdocs.org/ad/79-12-10): Tail Rotor Blades · Sikorsky S-61A, S-61D, S-61E and 5 more ### Matched by engine (GE CT58-140-1) - [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 91-07-17](https://openairdocs.org/ad/91-07-17): Gas Generator · General Electric CT58-140-1. Effective Apr 26, 1991 - [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 - [AD 64-26-02](https://openairdocs.org/ad/64-26-02): Starter Drive Shaft Bearing · General Electric CT58-100-1, T58-GE-5, T58-GE-1 and 3 more. Effective Jun 3, 1966 ### 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 ## Information bulletins (advisory) None matched. ## NTSB investigations None matched to N4263A. ## FAA accident and incident reports None matched to N4263A. ## Service difficulty reports None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. ## STCs that may be installed (OpenAirDocs) (19) 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-61R) - [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 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 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 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 SA2693NM](https://openairdocs.org/stc/SA2693NM): Installation of Electronics International digital volt/amp gauges and accessories. Electronics International Inc - [STC SR01585NY](https://openairdocs.org/stc/SR01585NY): Installation of Carson Helicopters, Inc. composite main rotor blades, P/N 163-101-1. Carson Helicopters Inc - [STC SA02279AK](https://openairdocs.org/stc/SA02279AK): 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 . Acrohelipro Global Services USA Inc - [STC SR09448RC](https://openairdocs.org/stc/SR09448RC): Installation of Concorde Battery Corporation Model RG-3BOE/44 Valve Regulated Sealed Lead Acid Battery. Carson Helicopters Inc - [STC SR01210NY](https://openairdocs.org/stc/SR01210NY): Extension of main rotor blade, P/N 61170-20201 series. For model S-61A, serial numbers 61-063, 61-147, 61-232, 61-272; for model S-61N, 61-216, 61-220, 61-242, 61-744; for model S-61R, 61-551. Carson Helicopters, Inc - [STC SR02373AT](https://openairdocs.org/stc/SR02373AT): Manufacture of a titanium transmission support fitting assembly. Clayton International Inc - [STC SR00367NY](https://openairdocs.org/stc/SR00367NY): Installation of .020 inch stainless steel fuselage skin and use of existing titanium firewalls. Carson Helicopters Inc - [STC SR00355NY](https://openairdocs.org/stc/SR00355NY): Installation of Sponson and Equipment assemblies. Carson Helicopters Inc - [STC SA1626NM PAGE 2](https://openairdocs.org/stc/SA1626NM%20PAGE%202): Installation of Electronics Int'l Digital EGT/CHT Instruments and accessories. (201 Series). Electronics International - [STC SH853NE](https://openairdocs.org/stc/SH853NE): Replacement of life-limited components. Rotair Industries, Inc - [STC SA4302NM](https://openairdocs.org/stc/SA4302NM): Installation of Electronics Int'l digital automatic engine analyzer. Electronics International - [STC SH413NW](https://openairdocs.org/stc/SH413NW): Installation of an electronic weighing system. Measurement Systems Intl ## Earlier aircraft with N4263A The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N4263A before. - [Cancelled 1992-05-28](https://openairdocs.org/deregistered/N4263A-1992-05-28): Ashbrook Robert W KOLB MK III, S/N MIII032. Exported to Norway. Owner: [Ashbrook Robert W](https://openairdocs.org/faa-owner/ASHBROOK%20ROBERT%20W), [Allentown, PA](https://openairdocs.org/faa-place/PA/Allentown) - [Cancelled 1975-09-29](https://openairdocs.org/deregistered/N4263A-1975-09-29): Beech 95-B55, S/N TC-1332. Exported to Canada. Owner: [Kaebnick Warren W](https://openairdocs.org/faa-owner/KAEBNICK%20WARREN%20W), [Troy, OH](https://openairdocs.org/faa-place/OH/Troy) - [Cancelled 1965-06-02](https://openairdocs.org/deregistered/N4263A-1965-06-02): Benson GYROCOPTER, S/N 1. Owner: [Peck Frank R](https://openairdocs.org/faa-owner/PECK%20FRANK%20R), [Roseland, NJ](https://openairdocs.org/faa-place/NJ/Roseland) ## Related - Other Sikorsky S-61R aircraft: https://openairdocs.org/model/sikorsky-s-61r/aircraft.md - The GE CT58-140-1 engine: https://openairdocs.org/engine/ge-ct58-140-1.md --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.