# Service difficulty reports: Sikorsky S-61A A list on [Sikorsky S-61A](https://openairdocs.org/model/sikorsky-s-61a.md). Newest first. General aviation reporting is voluntary. - [SDR CA131223012](https://openairdocs.org/sdr/CA131223012.md): Bracket · wrong part · Dec 16, 2013 · Skrsky S61A · Main Rotor System > (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 OR SN`S STAMPED ON THE UNIT, MACHINING AND ANODIZING COLOR DOES NOT APPEAR TO BE CONSISTENT WITH PRO - [SDR JYER20140204001](https://openairdocs.org/sdr/JYER20140204001.md): Cover · cracked · Sep 21, 2013 · N1043T · Skrsky S61A · Main Rotor Gearbox > 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 RELEASED UNDER CRS W/O 7027. THE TRANSMISSION WAS INSTALLED ON THE SAME AIRCRAFT AT ACFT TT: 38,798.9 AND - [SDR CA091102004](https://openairdocs.org/sdr/CA091102004.md): Ring Gear · cracked · Oct 30, 2009 · Skrsky S61A · Main Rotor Gearbox > (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 BROKEN AND ONE OF THE MS21045-5 MOUNTING NUTS WAS CRACKED. ALSO 3 OF THE BRG SUPPORT MOUNTING STUD HOLE B - [SDR CA090812005](https://openairdocs.org/sdr/CA090812005.md): Bearing Cage · out of limits · Aug 7, 2009 · Skrsky S61A · Main Rotor Gearbox > 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 LIMIT IS.016" AND AVERAGE READING WHEN CHECKED WAS.021". COMPANY SQID NR 09-06198 ISSUED. - [SDR CA090324010](https://openairdocs.org/sdr/CA090324010.md): Freewheel Unit · mismanufactured · Mar 24, 2009 · Skrsky S61A · Engine/Transmission Coupling > (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 61350-20878-103 NUT. THREADS ON CAM APPEAR TO BE CUT DEEP ON ONE SIDE AND SHALLOW ON THE OTHER. A VISUA - [SDR CA081128002](https://openairdocs.org/sdr/CA081128002.md): Bevel Gear · unserviceable · Nov 3, 2008 · Skrsky S61A · Main Rotor Gearbox > (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-ONE TO BE REPAIRED TSN: 31804:41 TSO: 769:56 DISASSY DONE AT HELI-ONE TO FIND THAT THE INPUT BEVEL GEA - [SDR CA081127002](https://openairdocs.org/sdr/CA081127002.md): Bearing · failed · Nov 3, 2008 · Skrsky S61A · Main Rotor Mast/Swashplate > (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-ONE TSN: 15634:00 TSO: 772:29 HELI-ONE DISASSEMBLED THE MGB TO FIND THAT THE MAST DUPLEX BRG P/N:SB13 - [SDR CA080722009](https://openairdocs.org/sdr/CA080722009.md): Throttle Plate · failed · Jul 22, 2008 · Skrsky S61A · Power Lever > (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, THE PLATE SHATTERED AT THE FWD BOLT HOLE. ALL 10 PLATES RECEIVED IN FROM THIS VENDOR HAVE BEEN ACCOU - [SDR CA060310006](https://openairdocs.org/sdr/CA060310006.md): Flange · failed · Mar 10, 2006 · Skrsky S61A · Main Rotor Brake > 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 SUBMITTED VARIOUS CERTIFICATION DOCUMENTS TO VALIDATE PART. PART JOURNAL IS UNDERSIZE AND IN NEED OF A - [SDR 2005FA0000827](https://openairdocs.org/sdr/2005FA0000827.md): Bearing · brinelled · Jun 1, 2005 · N1043T · Skrsky S61A · Tail Rotor Head > 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 (MINIMAL AMOUTS). RECOMMEND DAILY PURGING OF HUB BEARING TO PREVENT ANOTHER OCCURENCE. (K) - [SDR CA040707005](https://openairdocs.org/sdr/CA040707005.md): Bellcrank · mismanufactured · Jul 7, 2004 · Skrsky S61A · Rotorcraft Flight Control > BELLCRANK CONTACTING LINK ASSY CAUSING UNWANTED MOVEMENT OF EITHER CYCLIC OR COLLECTIVE CONTROLS. BELLCRANK DIMENSIONALLY CHECKED AGAINST SIKORSKY DRAWING NR S6140-62122 AND FOUND TO BE NONCONFORMING FROM MANUFACTURE. BELLCRANK ASSEMBLY IS TRIANGULAR IN SHAP - [SDR ERAA096633](https://openairdocs.org/sdr/ERAA096633.md): Freewheel Unit · corroded · Jun 18, 2004 · Skrsky S61A · Main Rotor Gearbox > SERVICE CORROSION ON TEETH. HAS EXTERNAL CORROSION, PITTING, BEYOND LIMITS ON SPUR GEAR ACTION TAKEN: REPACK UNITS BEING STORED FOR EXTENDED PERIODS. SPUR GEAR CHANGED. - [SDR CA020326008](https://openairdocs.org/sdr/CA020326008.md): Housing · cracked · Mar 26, 2002 · Skrsky S61A · Main Rotor Gearbox > (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 HEAVY RING GEAR; CURRENTLY PLUGGED). CRACKS ARE ABOUT 0.18-0.27 INCHES LONG MEASU RED FROM CRACK CENTE - [SDR JYE2001F00000](https://openairdocs.org/sdr/JYE2001F00000.md): Cable · frayed · Oct 16, 2001 · N1048Y · Skrsky S61A · Tail Rotor Control System > 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 HAD BEEN ROUTED OVER THE CABLE GUARD PIN INSTEAD OF THE PULLEY. THE CABLE IS BEING SENT OUT FOR ME - [SDR 99ZZZX3082](https://openairdocs.org/sdr/99ZZZX3082.md): Rotor Disc · cracked · Jul 30, 1999 · N693CC · Skrsky S61A · Turbine Engine Compressor Section > 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 SLOTS. ONE EACH IN TWO SLATS. POSSIBLE CAUSE, PITTING AND/OR INCLUSION. RECURRENCE PREVENTION: - [SDR 96ZZZX2583](https://openairdocs.org/sdr/96ZZZX2583.md): Spindle · cracked · Apr 23, 1996 · N1043T · Skrsky S61A · Tail Rotor Head > SPINDLE WAS FOUND CRACKED IN AREA OF FIRST THREAD. SPINDLE HAS BEEN SENT TO SIKORSKY AIRCRAFT. - [SDR 96ZZZX1028](https://openairdocs.org/sdr/96ZZZX1028.md): Vertical Hinge · cracked · Feb 15, 1996 · N1048Y · Skrsky S61A · Main Rotor Head > CRACK FOUND DURING OVERHAUL OF MAIN ROTOR HEAD. VERTICAL HINGE WAS MAGNETIC PARTICAL. INSPECTED PER OVERHAUL MANUAL. CRACK WAS LOCATED ABOUT.75 INCH BELOW THREADED AREA IN 2.6238 BEARING JOURNAL. THE CRACK WAS ABOUT.75 INCH LONG, GOING UP THROUGH THE THRE - [SDR JYER960111](https://openairdocs.org/sdr/JYER960111.md): Spindle · cracked · Jan 11, 1996 · N1043T · Skrsky S61A · Tail Rotor Head > 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.md): Bearing · failed · Dec 22, 1995 · N1043T · Skrsky S61A · Turbine Engine Accessory Drive > 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 POINT. SUBMITTER RECOMMENDS REPLACING BEARINGS AT 3,600 HOURS TT. - [SDR JYER951221](https://openairdocs.org/sdr/JYER951221.md): Ring Gear Tooth · broke · Dec 21, 1995 · N1048Y · Skrsky S61A · Main Rotor Gearbox > 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 AT HARD LINE ON TOOTH. MISSING 1.4 INCHES OF TOOTH WAS BROKEN IN ABOUT 20 PIECES. COMPONENT N - [SDR JYER951214](https://openairdocs.org/sdr/JYER951214.md): Fitting · cracked · Dec 14, 1995 · N1048Y · Skrsky S61A · Main Landing Gear Attach Section > 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 GEAR. (X) - [SDR 95ZZZX2452](https://openairdocs.org/sdr/95ZZZX2452.md): Camshaft · cracked · May 4, 1995 · N318Y · Skrsky S61A · Main Rotor Gearbox > 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 NOTIFIED AND CAM SENT FOR FRACTURE ANALYSIS. REF: OPERATOR CONTROL NR JYER950504. - [SDR 95ZZZX2400](https://openairdocs.org/sdr/95ZZZX2400.md): Fitting · cracked · May 4, 1995 · N1043T · Skrsky S61A · Fuselage Miscellaneous Structure > 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 CHECK OF FITTING ANY TIME GEAR IS REMOVED. - [SDR 95ZZZX2399](https://openairdocs.org/sdr/95ZZZX2399.md): Camshaft · cracked · Mar 27, 1995 · N1048Y · Skrsky S61A · Main Rotor Gearbox > 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 CHIP PLUG AND SCREEN WERE CHECKED AND A FEW SMALL SLIVERS WERE FOUND ON THE CHIP PLUG AND 12 SMAL - [SDR 95ZZZX2140](https://openairdocs.org/sdr/95ZZZX2140.md): Fitting · cracked · Mar 12, 1995 · N318Y · Skrsky S61A · Fuselage, Landing Gear Attach Fittings > 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 THROUGH EAR. - [SDR 95ZZZX1343](https://openairdocs.org/sdr/95ZZZX1343.md): Rear Cover · cracked · Feb 1, 1995 · N1043T · Skrsky S61A · Main Rotor Gearbox > 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.md): Hinge · cracked · Feb 1, 1995 · N318Y · Skrsky S61A · Nacelle/Pylon, Attach Fittings > 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 AND 23.6 HOURS AFTER AD 76-08-01 WAS C/W. SUBMITTER RECOMMENDATIONS - KEEP HINGE BUSHINGS TIGHT AN - [SDR 95ZZZX1340](https://openairdocs.org/sdr/95ZZZX1340.md): Bearing · worn · Feb 1, 1995 · N1048Y · Skrsky S61A · Tail Rotor Head > 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 REMOVAL. BALL BEARINGS APPEARED NORMAL. SIKORSKY AIRCRAFT SAID THIS IS CAUSED FROM LACK OF PROPER LUBR - [SDR 95ZZZX1338](https://openairdocs.org/sdr/95ZZZX1338.md): Blade · cracked · Feb 1, 1995 · N1043T · Skrsky S61A · Tail Rotor Blades > TAIL ROTOR BLADE SKIN CRACK OUTBOARD SIDE APPROXIMATELY 19 INCHES FROM ROOT END OF BLADE. SUBMITTER RECOMMENDATIONS - CLEAN AND INSPECT DAILY PER SIKORSKY INSPECTION PROGRAM. - [SDR 95ZZZX1337](https://openairdocs.org/sdr/95ZZZX1337.md): Blade · cracked · Feb 1, 1995 · N1043T · Skrsky S61A · Tail Rotor Blades > TAIL ROTOR BLADE SKIN CRACK OUTBOARD SIDE APPROXIMATELY 20 INCHES FROM ROOT END OF BLADE. RECOMMENDATIONS - CLEAN AND INSPECT DAILY PER SIKORSKY INSPECTION PROGRAM. - [SDR 95ZZZX1336](https://openairdocs.org/sdr/95ZZZX1336.md): Blade · cracked · Feb 1, 1995 · N1048Y · Skrsky S61A · Tail Rotor Blades > TAIL ROTOR BLADE SKIN CRACK OUTBOARD SIDE APPROXIMATELY 20 INCHES FROM ROOT END OF BLADE. RECOMMENDATIONS - CLEAN AND INSPECT DAILY PER SIKORSKY INSPECTION PROGRAM. - [SDR 95ZZZX1335](https://openairdocs.org/sdr/95ZZZX1335.md): Blade · cracked · Feb 1, 1995 · N1048Y · Skrsky S61A · Tail Rotor Blades > TAIL ROTOR BLADE SKIN CRACK OUTBOARD SIDE APPROXIMATELY 18 INCHES FROM ROOT END OF BLADE. SUBMITTER RECOMMENDATION - CLEAN AND INSPECT DAILY PER SIKORSKY INSPECTION PROGRAM. ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet' WHERE aircraft_model_key = 'S61A' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/model/sikorsky-s-61a/reports --- 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.