# Sikorsky S-61A

- Type: Aircraft model (FAA registry)
- Registry code: 814210C
- Manufacturer (registry): SIKORSKY
- Model: S-61A
- Aircraft type: Rotorcraft
- Category: Rotorcraft
- Engines: 2 · Turbo-shaft
- Seats: 28
- Weight class: 12,500 to 19,999 lb
- Cruise speed: 129 mph
- Certification: Type certificated
- Data sheet: [TCDS H2EA](https://openairdocs.org/tcds/H2EA) (OpenAirDocs)
- Holder: Sikorsky Aircraft Corporation
- Registered aircraft: 5
- Page: https://openairdocs.org/model/sikorsky-s-61a

Model codes come from the FAA registry's reference file. ADs are matched to them by model name and maker.

## ADs that may apply (OpenAirDocs)

Matched to this model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment.

- [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 2021-10-16](https://openairdocs.org/ad/2021-10-16): Engine/Transmission Coupling · Carson Helicopters S-61L, SH-3H, SH-3H and 6 more. Effective Jul 1, 2021
- [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 2013-05-17](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 2008-10-04](https://openairdocs.org/ad/2008-10-04): Chip detectors · Sikorsky S-61A, S-61D, S-61E and 1 more. Effective Jun 12, 2008
- [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 84-11-03](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 76-08-01 R1](https://openairdocs.org/ad/76-08-01-R1): Tail Rotor Pylon · Sikorsky S-61A, S-61D, S-61E and 2 more. Effective Dec 29, 1980
- [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 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 73-15-01](https://openairdocs.org/ad/73-15-01): Rear Fuselage and Pylon Fittings · Sikorsky S-61A, S-61D, S-61E and 2 more. Effective Jul 27, 1973
- [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 79-12-10](https://openairdocs.org/ad/79-12-10): Tail Rotor Blades · Sikorsky S-61A, S-61D, S-61E and 5 more
- [AD 78-12-05](https://openairdocs.org/ad/78-12-05): Fixed S-61L Type Landing Gears · Sikorsky S-61A, S-61L, S-61N and 1 more

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

## Registered aircraft (5)

- [N1043T](https://openairdocs.org/aircraft/N1043T): [Croman Corp](https://openairdocs.org/faa-owner/CROMAN%20CORP), [White City, OR](https://openairdocs.org/faa-place/OR/White%20City), built 1961, S/N 61083
- [N1048Y](https://openairdocs.org/aircraft/N1048Y): [Croman Corp](https://openairdocs.org/faa-owner/CROMAN%20CORP), [White City, OR](https://openairdocs.org/faa-place/OR/White%20City), built 1961, S/N 61161
- [N5193Y](https://openairdocs.org/aircraft/N5193Y): [Aircraft Guaranty Corp Trustee](https://openairdocs.org/faa-owner/AIRCRAFT%20GUARANTY%20CORP%20TRUSTEE), [Oklahoma City, OK](https://openairdocs.org/faa-place/OK/Oklahoma%20City), built 1963, S/N 61-184
- [N624CK](https://openairdocs.org/aircraft/N624CK): [Croman Corp](https://openairdocs.org/faa-owner/CROMAN%20CORP), [White City, OR](https://openairdocs.org/faa-place/OR/White%20City), built 1964, S/N 61272
- [N9696W](https://openairdocs.org/aircraft/N9696W): [Croman Corp](https://openairdocs.org/faa-owner/CROMAN%20CORP), [White City, OR](https://openairdocs.org/faa-place/OR/White%20City), built 1960, S/N 61147

## NTSB investigations (7)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB WPR15LA248](https://openairdocs.org/ntsb/WPR15LA248), Aug 20, 2015: Sikorsky S 61A (N1043T), Ironside, OR, substantial damage. Probable cause: A loss of power to the No. 2 engine due to the failure of the accessory gearbox drivetrain. Also causal was the pilot’s inability to release the external longline due to the use of a safety wire…
- [NTSB ATL03FA065](https://openairdocs.org/ntsb/ATL03FA065), Mar 23, 2003: Sikorsky S-61A (N81664), Kimble, TN, destroyed, 1 fatal. Probable cause: The interruption of rotor system drive power due to the input free wheeling unit malfunctioning , and the pilot's operation of the helicopter in the critical area of the height-velocity curve.
- [NTSB NYC03LA037](https://openairdocs.org/ntsb/NYC03LA037), Jan 12, 2003: Sikorsky S-61A (N8170V), Glady, WV, substantial damage. Probable cause: The improper installation of the left tailrotor control cable by company maintenance personnel.
- [NTSB LAX02FA116](https://openairdocs.org/ntsb/LAX02FA116), Mar 26, 2002: Sikorsky S-61A (N318Y), Lakehead, CA, destroyed, 1 fatal. Probable cause: A loss of engine power for undetermined reasons, and the flight crew's failure to maintain rotor rpm following a loss of engine power while maneuvering.
- [NTSB ANC01LA109](https://openairdocs.org/ntsb/ANC01LA109), Aug 11, 2001: Sikorsky S61A (N5193Y), Wrangell, AK, substantial damage. Probable cause: The separation of a steel long line cable that failed and rebounded from a load of logs into the helicopter's main and tail rotors.
- [NTSB LAX00LA193](https://openairdocs.org/ntsb/LAX00LA193), May 11, 2000: Sikorsky S61A (N693CC), Eureka, CA, substantial damage. Probable cause: the loss of power in all engines due to the pilot's inadequate in-flight decision to continue flight with fuel level below the landing minimums specified in the flight manual, which resulted in the…
- [NTSB SEA73FYG21](https://openairdocs.org/ntsb/SEA73FYG21), Dec 14, 1972: Sikorsky S-61A (N318Y), Chelan, WA, destroyed, 2 fatal

## FAA accident and incident reports (7)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Incident 20230821009989I](https://openairdocs.org/incident/20230821009989I), Aug 21, 2023: Sikorsky S-61A (N1048Y), Deer Park, WA, Minor damage. Helicopter was performing firefighting operations, during a hover over dip site to fill tanks, rotor made contact with tree limb. Precautionary landing made at…
- [Accident 20150819013969A](https://openairdocs.org/incident/20150819013969A), Aug 19, 2015: Sikorsky S-61A (N1043T), Unity, OR, Destroyed. While performing a wildland firefighting mission under 14 CFR part 133, this aircraft experience a partial rotor system power loss (PIC and SIC assumed this…
- [Accident 20030323003739A](https://openairdocs.org/incident/20030323003739A), Mar 23, 2003: Skrsky S61A (N81664), Kembal, TN, Destroyed, 1 fatal. (-23) On 3/23/03 a Sikorsky S-16A, N81664, registered to and operated by carson helicopters inc., collided with terrain and burst into flames during a logging…
- [Accident 20030112001679A](https://openairdocs.org/incident/20030112001679A), Jan 12, 2003: Skrsky S61A (N8170V), Glady, WV, Substantial damage. (-23) Pilot stated that he lost tail rotor control while hovering above a field at around 3600 ft MSL during a logging operation. Attempts to recover from the…
- [Accident 20020326007939A](https://openairdocs.org/incident/20020326007939A), Mar 26, 2002: Skrsky S61A (N318Y), Dusmuir, CA, No damage, 1 fatal. (-23) While helicopter was conducting logging operations, it experienced loss of rotor RPM, the rotor blades coned up, followed by the aircraft droppinto into…
- [Accident 20010811039289A](https://openairdocs.org/incident/20010811039289A), Aug 11, 2001: Skrsky S61A (N5193Y), Wrangell, AK, Substantial damage. (-23) Investigation revealed that the 5/8" steel cable (long line) had failed between the helicopter sling hook and the external sling load (logs) at the time…
- [Accident 20000510012809A](https://openairdocs.org/incident/20000510012809A), May 10, 2000: Skrsky S61A (N693CC), Eureka, CA, No damage. (-23) On may 10, 2000 at 1500 hrs PDT, a Sikorsky S61A, N693CC, experienced a dual engine failure (#1 engine failed and 10 seconds later #2 engine failed) on…

## Service difficulty reports (32)

As reported by operators and repair stations, by the model named in the report.

- [SDR CA131223012](https://openairdocs.org/sdr/CA131223012), Dec 16, 2013: BRACKET. WRONG PART. (CAN) STATIONARY SCISSORS ASSY, PN S6110-24035-002 DISASSEMBLED AND THE BRACKET APPEARS TO BE NON OEM. BRACKET, PN SHOULD BE S6110-24070-000. THERE ARE NO PN`S 
- [SDR JYER20140204001](https://openairdocs.org/sdr/JYER20140204001), Sep 21, 2013: COVER. CRACKED. REMOVED FROM MGB. A CRACK WAS DISCOVERED BY FIELD MAINTENANCE ON THE GEARBOX COVER AND THE GEARBOX WAS REMOVED AT ACFT TT: 38,523.7. IT WAS REPAIRED AND RELEASE
- [SDR CA091102004](https://openairdocs.org/sdr/CA091102004), Oct 30, 2009: RING GEAR. CRACKED. (CAN) DURING DISASSEMBLY OF THE S61MGB , THE RING GEAR PN: S6135-2201-003 WAS FOUND TO BE CRACKED. ALONG WITH THE RING GEAR, ONE OF THE MOUNTING STUDS WAS BROKE
- [SDR CA090812005](https://openairdocs.org/sdr/CA090812005), Aug 7, 2009: BEARING CAGE. OUT OF LIMITS. BEARING CONE PN: SB3316-101 RECEIVED NEW WAS CAGE SHAKE CHECKED AND FOUND TO BE BEYOND LIMITS FOR USED BEARINGS IAW SA4047-76-7-8, CHG.10-30 NOV 08. MANUAL LIMI
- [SDR CA090324010](https://openairdocs.org/sdr/CA090324010), Mar 24, 2009: FREEWHEEL UNIT. MISMANUFACTURED. (CAN) A RT FREEWHEEL UNIT WAS EVALUATION OF MISMANUFACTURED FREEWHEEL CAM. DURING FREEWHEEL CHANGE IT WAS FOUND THAT SB2158-102 BRG WOULD NOT FIT PAST THE 61350
- [SDR CA081128002](https://openairdocs.org/sdr/CA081128002), Nov 3, 2008: BEVEL GEAR. UNSERVICEABLE. (CAN) BROKEN GEAR TOOTH FOUND IN FILTER REPAIR-BROKEN GEAR TOOTH FOUND IN FILTER OF S61 MGB SN: A14-215. MGB WAS REMOVED FROM ACFT HS-HTA AND REURNED TO HELI-ON
- [SDR CA081127002](https://openairdocs.org/sdr/CA081127002), Nov 3, 2008: BEARING. FAILED. (CAN) S61MGB S/N: A14-J-10-79-1119 SUPPLIED, HAD A INDICATION ON THE MGB BEING CONTAMINATED WITH METAL. REMOVED THE MGB FROM THE ACFT, AND RETURNED IT TO HELI-O
- [SDR CA080722009](https://openairdocs.org/sdr/CA080722009), Jul 22, 2008: THROTTLE PLATE. FAILED. (CAN) S61 ENGINEERS WERE REPLACING A EMERGENCY THROTTLE PLATE P/N S6130-62017-3 WITH A PLATE THAT HAD BEEN RECEIVED. ON INSTALLATION WHEN TIGHTENING THE BOLTS, 
- [SDR CA060310006](https://openairdocs.org/sdr/CA060310006), Mar 10, 2006: FLANGE. FAILED. ATTEMPTED TO REPLACE A PART DAMAGED BEYOND REPAIR. A PART WAS LOCATED AND ACQUIRED TO REPLACE DAMAGED UNIT. PART WAS DELIVERED TO US FOR REVIEW. SUPPLIER SUBMIT
- [SDR 2005FA0000827](https://openairdocs.org/sdr/2005FA0000827), Jun 1, 2005: BEARING. BRINELLED. AT OVERHAUL, REMOVED HUB BEARING INNER RACES AND FOUND (1 EACH) CRACKED ABOUT 1.5 INCHES DUE TO SEVERE BRINNELING. PROBABLE CAUSE COULD BE DUE TO GREASE (MINIMA
- [SDR CA040707005](https://openairdocs.org/sdr/CA040707005), Jul 7, 2004: BELLCRANK. MISMANUFACTURED. BELLCRANK CONTACTING LINK ASSY CAUSING UNWANTED MOVEMENT OF EITHER CYCLIC OR COLLECTIVE CONTROLS. BELLCRANK DIMENSIONALLY CHECKED AGAINST SIKORSKY DRAWING NR S6
- [SDR ERAA096633](https://openairdocs.org/sdr/ERAA096633), Jun 18, 2004: FREEWHEEL UNIT. CORRODED. SERVICE CORROSION ON TEETH. HAS EXTERNAL CORROSION, PITTING, BEYOND LIMITS ON SPUR GEAR ACTION TAKEN: REPACK UNITS BEING STORED FOR EXTENDED PERIODS. SPUR GEAR 
- [SDR CA020326008](https://openairdocs.org/sdr/CA020326008), Mar 26, 2002: HOUSING. CRACKED. (CAN) 6 CRACKS WERE NOTED ON AFT END OF OUTER FLANGE UNDERNEATH STUD HOLES. 2 OF CRACKS ARE UNDER STUD HOLES, WHICH WERE NOT INST WITH STUDS (PRE-TAPPED FOR HEA
- [SDR JYE2001F00000](https://openairdocs.org/sdr/JYE2001F00000), Oct 16, 2001: CABLE. FRAYED. TAIL ROTOR CABLE (PN S6140-65612-11) WAS FOUND BADLY FRAYED AND BROKEN AFTER PILOT MADE AN UNEVENTFUL LANDING, AT AN AIRPORT. THE PROBABLE CAUSE IS THE CABLE HA
- [SDR 99ZZZX3082](https://openairdocs.org/sdr/99ZZZX3082), Jul 30, 1999: ROTOR DISC. CRACKED. DURING LIGHT OVERHAUL, THE STAGE 1 COMPRESSOR ROTOR DISC WAS VISUALLY INSPECTED. TWO CRACKS WERE FOUND ON THE AFT FACE, IN THE CORNER, OF THE LT BLADE COVETHAIL
- [SDR 96ZZZX2583](https://openairdocs.org/sdr/96ZZZX2583), Apr 23, 1996: SPINDLE. CRACKED. SPINDLE WAS FOUND CRACKED IN AREA OF FIRST THREAD. SPINDLE HAS BEEN SENT TO SIKORSKY AIRCRAFT.
- [SDR 96ZZZX1028](https://openairdocs.org/sdr/96ZZZX1028), Feb 15, 1996: VERTICAL HINGE. CRACKED. CRACK FOUND DURING OVERHAUL OF MAIN ROTOR HEAD. VERTICAL HINGE WAS MAGNETIC PARTICAL. INSPECTED PER OVERHAUL MANUAL. CRACK WAS LOCATED ABOUT .75 INCH BELOW THRE
- [SDR JYER960111](https://openairdocs.org/sdr/JYER960111), Jan 11, 1996: SPINDLE. CRACKED. AT OVERHAUL, TAIL ROTOR SPINDLE WAS FOUND CRACKED IN AREA OF FIRST THREAD. SIKORSKY AIRCRAFT HAS BEEN NOTIFED AND THE SPINDLE SENT TO THEM. (X)
- [SDR 96ZZZX269](https://openairdocs.org/sdr/96ZZZX269), Dec 22, 1995: BEARING. FAILED. THE ENGINE LOST FUEL AND OIL PRESSURE IN-FLIGHT AND QUIT. THE ACCESSORY DRIVE GEARBOX PINION SHAFT BEARINGS FAILED AND ALLOWED GEAR DISSENGAGEMENT TO FAILURE PO
- [SDR JYER951221](https://openairdocs.org/sdr/JYER951221), Dec 21, 1995: RING GEAR TOOTH. BROKE. PILOTS OBSERVED CHIP LIGHT. LANDED IMMEDIATELY. CHIPS BEYOND LIMITS FOUND ON CHIP PLUG. LOWER HALF OF RING GEAR TOOTH BROKE OFF. CRACK APPEARS TO HAVE INITIATED
- [SDR JYER951214](https://openairdocs.org/sdr/JYER951214), Dec 14, 1995: FITTING. CRACKED. RIGHT REAR FUSELAGE LANDING GEAR FITTING CRACKED AT AFT EAR OUT OF BOLT HOLE. INSIDE OF EAR HAD SOME FRETTING. SUBMITTER RECOMMENDS PERIODIC RETORQUE OF LANDING
- [SDR 95ZZZX2452](https://openairdocs.org/sdr/95ZZZX2452), May 4, 1995: CAMSHAFT. CRACKED. ON SHUT-DOWN, PILOTS FELT AN UNUSUAL VIBRATION AND GROWL. NR 1 CAMSHAFT FOUND CRACKED ABOUT 340 DEGREES AROUND CAM THROUGH OIL HOLES. SIKORSKY AIRCRAFT HAS BEEN
- [SDR 95ZZZX2400](https://openairdocs.org/sdr/95ZZZX2400), May 4, 1995: FITTING. CRACKED. RIGHT REAR FUSELAGE FITTING HAD A SMALL CRACK ON INSIDE OF REAR EAR. CRACK WAS FOUND BY DYE CHECK OF FITTING WHILE DOING A LANDING GEAR CHANGE. RECOMMEND DYE CH
- [SDR 95ZZZX2399](https://openairdocs.org/sdr/95ZZZX2399), Mar 27, 1995: CAMSHAFT. CRACKED. PILOT HEARD AN UNUSUAL GROWLING NOISE FROM THE NR 1 INPUT AT REDUCED POWER. A FEW HOURS LATER, A SLIGHT VIBRATION AT REDUCED POWER WAS FELT IN THE AIRFRAME. THE
- [SDR 95ZZZX2140](https://openairdocs.org/sdr/95ZZZX2140), Mar 12, 1995: FITTING. CRACKED. RIGHT REAR MAIN LANDING FUSELAGE FITTING FOUND CRACKED FROM BOLT HOLE. CRACK WAS ON INSIDE OF FORWARD EAR OF FITTING, AND WAS ABOUT 1 INCH LONG AND DID NOT GO T
- [SDR 95ZZZX1343](https://openairdocs.org/sdr/95ZZZX1343), Feb 1, 1995: REAR COVER. CRACKED. REAR COVER WAS FOUND CRACKED ON NR 2 GENERATOR BOSS. THIS WAS A SURFACE CRACK ON INSIDE OF GEARBOX REAR COVER, AND WAS FOUND AT OVERHAUL.
- [SDR 95ZZZX1342](https://openairdocs.org/sdr/95ZZZX1342), Feb 1, 1995: HINGE. CRACKED. UPPER PYLON HINGE LT EAR CRACKED THROUGH BOLT HOLE. HINGE WAS FOUND DURING WALK-AROUND INSPECTION AT FUEL STOP. THIS WAS 3.7 HOURS AFTER PRE-FLIGHT INSPECTION A
- [SDR 95ZZZX1340](https://openairdocs.org/sdr/95ZZZX1340), Feb 1, 1995: BEARING. WORN. BEARING INNER RACE HAD METAL REMOVED, APPROXIMATELY .0625 INCH WIDE BY .1875 INCH LONG. OUTER RACE HAD SMALL INDENTATIONS FROM BALL BEARINGS WITH NO METAL REMOV
- [SDR 95ZZZX1338](https://openairdocs.org/sdr/95ZZZX1338), Feb 1, 1995: BLADE. CRACKED. TAIL ROTOR BLADE SKIN CRACK OUTBOARD SIDE APPROXIMATELY 19 INCHES FROM ROOT END OF BLADE. SUBMITTER RECOMMENDATIONS - CLEAN AND INSPECT DAILY PER SIKORSKY INSPE
- [SDR 95ZZZX1337](https://openairdocs.org/sdr/95ZZZX1337), Feb 1, 1995: BLADE. CRACKED. TAIL ROTOR BLADE SKIN CRACK OUTBOARD SIDE APPROXIMATELY 20 INCHES FROM ROOT END OF BLADE. RECOMMENDATIONS - CLEAN AND INSPECT DAILY PER SIKORSKY INSPECTION PROG
- [SDR 95ZZZX1336](https://openairdocs.org/sdr/95ZZZX1336), Feb 1, 1995: BLADE. CRACKED. TAIL ROTOR BLADE SKIN CRACK OUTBOARD SIDE APPROXIMATELY 20 INCHES FROM ROOT END OF BLADE. RECOMMENDATIONS - CLEAN AND INSPECT DAILY PER SIKORSKY INSPECTION PROG
- [SDR 95ZZZX1335](https://openairdocs.org/sdr/95ZZZX1335), Feb 1, 1995: BLADE. CRACKED. TAIL ROTOR BLADE SKIN CRACK OUTBOARD SIDE APPROXIMATELY 18 INCHES FROM ROOT END OF BLADE. SUBMITTER RECOMMENDATION - CLEAN AND INSPECT DAILY PER SIKORSKY INSPEC

## STCs that may be installed (OpenAirDocs) (39)

Approved for this model: the STC's model list names it on its data sheet, or a series that includes it. In force first, then newest. The registry doesn't record which STCs an aircraft has.

- [STC SR00206NY](https://openairdocs.org/stc/SR00206NY): Installation of 11,000 pound capacity Cargo Sling. Carson Helicopters Inc
- [STC SR01858SE](https://openairdocs.org/stc/SR01858SE): Manufacture of the Isolair, Inc., Eliminator II Model 4600-S61 Fire Fighting System. Isolair Inc
- [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 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 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 SR01552SE](https://openairdocs.org/stc/SR01552SE): Fabrication and installation of an external aerial liquid dispensing tank. Carson Helicopters Inc
- [STC SR04483CH](https://openairdocs.org/stc/SR04483CH): Installation of NASI NREM18M Air Conditioning Module. National Aircraft Service Inc. (NASI)
- [STC SR02692SE](https://openairdocs.org/stc/SR02692SE): Installation of T58-GE-402 engines. Croman Corporation
- [STC SR01051DE](https://openairdocs.org/stc/SR01051DE): Installation of Croman Corporation Electric Heater. Croman Corporation
- [STC SH5654NM](https://openairdocs.org/stc/SH5654NM): Installation of Croman 10,000 lbs. cargo sling system and associated fuselage mounting hardpoints. Croman Corporation
- [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 SR02671LA](https://openairdocs.org/stc/SR02671LA): Installation of a shorter composite blade. Carson Helicopters, Inc
- [STC SR02601SE](https://openairdocs.org/stc/SR02601SE): Fabrication and installation of an internal fire retardant tank. 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 SR02077SE](https://openairdocs.org/stc/SR02077SE): Installation of the Observer Seat CRCS100-01. Croman Corporation
- [STC SR01427SE](https://openairdocs.org/stc/SR01427SE): Installation of S-61L fixed main landing gear. Croman Corporation
- [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 SR01426SE](https://openairdocs.org/stc/SR01426SE): Fabrication and installation of components for a left seat pilot-in-command operation. Croman Corporation
- [STC SR00319SE](https://openairdocs.org/stc/SR00319SE): Modification of Part Number S6137-23009-6 main transmission rear cover per. Croman Corporation
- [STC SR01771NY](https://openairdocs.org/stc/SR01771NY): Increase of Out of Ground Effect (OGE) Hover Performance. Carson Helicopters Inc
- [STC SR01981SE](https://openairdocs.org/stc/SR01981SE): Fabrication and installation of an internal fire retardant tank. Croman Corporation
- [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 SR01288SE](https://openairdocs.org/stc/SR01288SE): Fabrication of Ag-Air Systems Model 36000 Auxiliary Hydraulic System. Kawak Aviation Technologies Inc
- [STC SR01738SE](https://openairdocs.org/stc/SR01738SE): Installation of a Mechanical Specialties, Inc. model 6111, 11,000 pound capacity cargo hook. Mechanical Specialties Inc
- [STC SR02057NY](https://openairdocs.org/stc/SR02057NY): 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. Carson Helicopters, Inc
- [STC SR00208NY](https://openairdocs.org/stc/SR00208NY): Installation of General Electric CT58-140-1 turboshaft engines. 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 SR00330NY](https://openairdocs.org/stc/SR00330NY): Installation of improved parts for rotor transmission support. Carson Helicopters Inc
- [STC SR00205NY](https://openairdocs.org/stc/SR00205NY): Installation of fixed landing gear. Carson Helicopters Inc
- [STC SR00207NY](https://openairdocs.org/stc/SR00207NY): Installation of Engine Air Inlet Screens. Carson Helicopters Inc
- [STC SH3188NM](https://openairdocs.org/stc/SH3188NM): Pilot-in-Command position to be in either left or right seat with fully redundant controls and control-mounted switches. Croman Corporation
- [STC SH3189NM](https://openairdocs.org/stc/SH3189NM): Pilot-in-Command position to be in either left or right seat with fully redundant controls and control-mounted switches. Croman Corporation
- [STC SH2388NM](https://openairdocs.org/stc/SH2388NM): Installation of an Electronics International Digital Temperature Indicator with related thermocouples, adapters and harness to monitor the temperature fo the main gear box bearings. Croman Corporation
- [STC SH2389NM](https://openairdocs.org/stc/SH2389NM): Installation of an Electronics International Digital Temperature Indicator with related thermocouples, adapters and harness to monitor the temperature fo the main gear box bearings. Croman Corporation
- [STC SA1454NM](https://openairdocs.org/stc/SA1454NM): Installation of a forward left hand transmission fitting assembly fabricated from 4340 alloy steel. Croman Corporation

## PMA parts (OpenAirDocs) (744, first 50)

Current parts manufacturer approvals (PMA): parts the FAA has approved companies to make as replacements or modifications. Each record lists its models as free text; OpenAirDocs matched them to this model on its data sheet, so check the FAA record before relying on it. Newest first.

- [R6165-61517-101](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID115212629020230331175557.0001): Housing. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6165-61517-101 · Mar 24, 2023
- [R6135-22076-1](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID117187382020221108152623.0001): Bracket. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6135-22076-1 · Nov 2, 2022
- [AG627000-13](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID196789135920220809130924.0001): Gasket – Marker Beacon. Aviation Devices & Electronic Components LLC (Av-DEC) · PMA PQ3846SW · Modification part · May 10, 2022
- [No part number](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID170017506920220809102554.0001): Aviation Devices & Electronic Components LLC (Av-DEC) · PMA PQ3846SW · Apr 18, 2022
- [AG844000-15](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID134084726420220408135812.0001): Gasket – UHF/VHF Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Feb 8, 2022
- [AG728000-52](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID178262771720220408135730.0001): Gasket – Satcom Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Jan 26, 2022
- [AG627000-23](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID101289647120220408135710.0001): Gasket – Marker Beacon. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Dec 15, 2021
- [AG627000-12](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID181581173620220408140249.0001): Gasket – Marker Beacon Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Nov 17, 2021
- [AG358000-08](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID100561747320220408135824.0001): Gasket – ELT Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Nov 17, 2021
- [AG843000-17](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID383458205820211110110521.0001): Gasket-UHF/VHF Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Aug 9, 2021
- [R61350-20459-](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID999102048620210623160117.0001): BUSHING. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces 61350-20459-101 · Mar 12, 2021
- [RS5013-10-24](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID979933478420210623160155.0001): SCREW, WASHER HEAD, REGULAR & SELF-LOCKING. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces SS5013-10-24 · Mar 12, 2021
- [RB2106-103](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID948163446620210623160140.0001): BEARING. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces SB2106-103 · Mar 12, 2021
- [R6140-62118-5](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID898129055520210623160057.0001): TORQUE. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6140-62118-5 · Mar 12, 2021
- [RS5013- 10LP22A](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID766625084420210623160233.0001): SCREW, WASHER HEAD, REGULAR & SELF-LOCKING. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces SS5013-10LP22A · Mar 12, 2021
- [RS4059-25-524](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID615587716520210623160143.0001): SPACER. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces SS4059-25-524 · Mar 12, 2021
- [R6125-61861-1](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID605636896920210623160052.0001): STOP. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6125-61861-1 · Mar 12, 2021
- [R6130-80080-1](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID565579870820210623160053.0001): LINK. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6130-80080-1 · Mar 12, 2021
- [RS5013-10-22](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID512951038420210623160144.0001): SCREW, WASHER HEAD,. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces SS5013-10-22 · Mar 12, 2021
- [R6147-62006-](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID502154995920210623160111.0001): SLEEVE. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6147-62006-101 · Mar 12, 2021
- [R6165-20227-0](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID408920715820210623160113.0001): DECAL. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6165-20227-0 · Mar 12, 2021
- [R6140-62130-1](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID381251781320210623160104.0001): TUBE. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6140-62130-1 · Mar 12, 2021
- [R61350-20459-](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID332576867720210623160121.0001): BUSHING. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces 61350-20459-102 · Mar 12, 2021
- [R6120-60908-4](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID268935903720210623160048.0001): ROD END. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6120-60908-4 · Mar 12, 2021
- [RB2604-1](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID247427346420210623160141.0001): BEARING. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces SB2604-1 · Mar 12, 2021
- [R6140-62118-4](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID201299125520210623160054.0001): TORQUE. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6140-62118-4 · Mar 12, 2021
- [R6140-62130-2](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID189019395520210623160108.0001): WASHER. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6140-62130-2 · Mar 12, 2021
- [R6140-62130-0](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID172468332220210623160101.0001): SPACER. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6140-62130-0 · Mar 12, 2021
- [No part number](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID780520770202106231601020.0001): Rotair Aerospace Corporation · PMA PQ0781NE · Mar 11, 2021
- [AG358000-07](https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID997494457020210727195148.0001): Gasket – ELT Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Dec 11, 2020
- [AG786000-01](https://drs.faa.gov/browse/excelExternalWindow/F240EB736CAF9B6F86258639004F7BE3.0001): Gasket - StormScope Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Dec 8, 2020
- [R6132-61033-1](https://drs.faa.gov/browse/excelExternalWindow/83CDCA1AA07B786D8625863A005E0DF6.0001): SCREW. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6132-61033-1 · Dec 5, 2020
- [R6137-64329-2](https://drs.faa.gov/browse/excelExternalWindow/6BE5065103323AB38625864100400764.0001): Tube Assy. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6137-64329-2 · Dec 3, 2020
- [AG843000-79](https://drs.faa.gov/browse/excelExternalWindow/7C47B4B54B5941DF862586240047DC8E.0001): Gasket - UHF / AM / IFF Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Nov 17, 2020
- [SB2506-3ACD](https://drs.faa.gov/browse/excelExternalWindow/4A8E47F4070D43B2862586260044ADD3.0001): Inner Race, Needle Bearing. Aircraft Component Design LLC · PMA PQ2138NE · Replaces SB2506-3 · Nov 16, 2020
- [SB2506-1ACD](https://drs.faa.gov/browse/excelExternalWindow/292DA472085BF408862586260044AD96.0001): Inner Race, Needle Bearing. Aircraft Component Design LLC · PMA PQ2138NE · Replaces SB2506-1 · Nov 16, 2020
- [NREM-DL30](https://drs.faa.gov/browse/excelExternalWindow/D219BC331D25B5B586258625004DF7FA.0001): Air Conditioning Module. National Aircraft Svc Inc · PMA PQ2369CE · Modification part · Nov 15, 2020
- [NREM-DL30](https://drs.faa.gov/browse/excelExternalWindow/2D7E2FD3C1328B8E86258624006B60B3.0001): Air Conditioning Module. National Aircraft Svc Inc · PMA PQ2369CE · Modification part · Nov 15, 2020
- [AG477000-35](https://drs.faa.gov/browse/excelExternalWindow/CAA7A03C831CF5A78625861F004520E1.0001): Gasket - GPS ANTENNA. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Nov 11, 2020
- [R61350-24073-102](https://drs.faa.gov/browse/excelExternalWindow/FBF94D10D443C13986258610003B6232.0001): SUPPORT. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces 61350-24073-102 · Oct 27, 2020
- [AG822000-09](https://drs.faa.gov/browse/excelExternalWindow/B363A74FB05068CA862586020044D52C.0001): Gasket - TCAS Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Oct 13, 2020
- [R6135-20645](https://drs.faa.gov/browse/excelExternalWindow/4E9F83A1752B4DD786258601004FB14B.0001): SPACER. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6135-20645 · Oct 7, 2020
- [AG247000-05](https://drs.faa.gov/browse/excelExternalWindow/A8B3EE75D8E4BBD2862585E5006243CC.0001): Gasket - Security System Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Aug 24, 2020
- [AG843000-19](https://drs.faa.gov/browse/excelExternalWindow/6325AFC5586C8E34862585E500649009.0001): Gasket - VHF Antenna. Aviation Devices & Electronic Components, LLC · PMA PQ03846SW · Modification part · Aug 24, 2020
- [R6165-61584-0](https://drs.faa.gov/browse/excelExternalWindow/64BCCCF0B2BBA4C6862585DE00584152.0001): SPRING. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6165-61584-0 · Aug 19, 2020
- [R6110-21085-2](https://drs.faa.gov/browse/excelExternalWindow/5282BB91B127A7E9862585DE00583EF2.0001): BOLT. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6110-21085-2 · Aug 19, 2020
- [R6110-21085-4](https://drs.faa.gov/browse/excelExternalWindow/50B78CFFF367A29B862585DE0058400E.0001): BOLT. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6110-21085-4 · Aug 19, 2020
- [R6110-21085-3](https://drs.faa.gov/browse/excelExternalWindow/32551C1F77B0E55C862585DE00583F3D.0001): BOLT. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6110-21085-3 · Aug 19, 2020
- [R6110-25090-1](https://drs.faa.gov/browse/excelExternalWindow/1DD742FFA2E17709862585DE0058408F.0001): ARM. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6110-25090-1 · Aug 19, 2020
- [R6110-21085-1](https://drs.faa.gov/browse/excelExternalWindow/1B14F89786515C52862585DE00583E7D.0001): BOLT. Rotair Aerospace Corporation · PMA PQ0781NE · Replaces S6110-21085-1 · Aug 19, 2020

All of them: https://openairdocs.org/model/sikorsky-s-61a/pma.md

## The same model under other registry codes

Amateur-built copies and renamed makers get their own codes.

- [Carson Helicopters / Sikorsky S61A](https://openairdocs.org/model/carson-helicopters-sikorsky-s61a): 1 registered aircraft, registry code 814210N

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