# Service difficulty reports: JASC 6420 A list on [JASC 6420](https://openairdocs.org/jasc/6420.md). Reports filed under 6420 · Tail Rotor Head, newest first. Page 1 of 19 · 907 reports - [SDR QR9R2026040600002](https://openairdocs.org/sdr/QR9R2026040600002.md): Rotor Head · out of limits · Apr 6, 2026 · Bolkms BK117C2 > THE LAMINATED PILE ASSEMBLY WAS RECEIVED FROM SUPPLY WITH A GAP EXCESS OF.0078". - [SDR 8LFA202603100002](https://openairdocs.org/sdr/8LFA202603100002.md): Nut · loose · Mar 10, 2026 · N463LF · Bell 407 > DURING FLIGHT IT WAS NOTED AN ABNORMAL METALLIC NOISE EMANATING FROM THE TAIL BOOM AREA. IT WAS DECIDED TO PERFORM A PRECAUTIONARY LANDING DUE TO THE NOISE HEARD. UPON INSPECTION OF THE AIRCRAFT THE TAIL ROTOR MAST NUT WAS FOUND IN A LOOSE CONDITION. SAFETY - [SDR QR9R2026021800001](https://openairdocs.org/sdr/QR9R2026021800001.md): Rotor Head · out of limits · Feb 18, 2026 · Bolkms BK117C2 > RECEIVED LAMINATED PILE ASSEMBLY FROM SUPPLY WITH.013'' GAP IN LAMINATED PILE. MAX IS.008''. - [SDR QR9R2025040200001](https://openairdocs.org/sdr/QR9R2025040200001.md): Bearing · frayed · Apr 2, 2025 · Bolkms BK117C2 > BEARING SLEEVE ASSY TEFLON LINER WAS FOUND TO BE WORN (FRAYED) BEYOND LIMITS. PART WAS RECEIVED NEW FROM SUPPLY. REPLACED IAW AMM 64-20-00, 4-2 & 64-20-00, 4-1. - [SDR QMLA2025021020015](https://openairdocs.org/sdr/QMLA2025021020015.md): Cotter Pin · missing · Feb 10, 2025 · N102HN · Urocop EC135P1 > YAW SERVO ACTUATOR BRACE HAD A MISSING COTTER PIN ON POST FLIGHT INSPECTION. VERIFIED TORQUE ON T/R NUT. INSTALLED COTTER PIN. ALL MAINTENANCE COMPLETED. AIRCRAFT RELEASED TO REVENUE SERVICE. #MEC-005650 - [SDR QR9R2024050700001](https://openairdocs.org/sdr/QR9R2024050700001.md): Unknown · misaligned · May 7, 2024 · Bolkms BK117C2 > DURING INSTALLATION OF THE LAMINATED PILE ASSEMBLY, THE REPAIRED CENTER BORE DID NOT ALLOW PROPER ALIGNMENT OF THE THROUGH BOLT. - [SDR 2023F00311](https://openairdocs.org/sdr/2023F00311.md): Spherical Bearin · worn · Oct 18, 2023 · N452MH · Bolkms BK117C2 > ON DEPARTURE AND CLIMB OUT, THE PILOT NOTICED A VIBRATION IN THE T/R PEDALS THAT WOULD INCREASE WITH POWER WAS INCREASES. HE RETURNED TO THE AIRPORT AND LANDED UNEVENTFULLY. MAINTENANCE FOUND THE T/R TEETERING BEARINGS WERE WORN EXCESSIVELY. - [SDR QR9R2022112200002](https://openairdocs.org/sdr/QR9R2022112200002.md): Sleeve · out of limits · Nov 22, 2022 · Bolkms BK117C2 > INNER SLEEVE ASSY WAS RECEIVED FROM SUPPLY WITH REPLACEMENT BUSHINGS IMPROPERLY HONED WHICH PREVENTS BOLT FROM PASSING THROUGH. - [SDR QR9R2022111500001](https://openairdocs.org/sdr/QR9R2022111500001.md): Bolt · out of tolerance · Nov 15, 2022 · Bolkms BK117C2 > FITTED BOLT WAS RECEIVED FROM SUPPLY OUT OF TOLERANCE. MINIMUM LIMIT FOR OUTSIDE DIAMETER IS 0.038" IAW AMM 64-20-00, 6-3 F1 D.2.C. SHANK OUTSIDE DIAMETER OF BOLT MEASURED 0.3737". - [SDR 2022F00337](https://openairdocs.org/sdr/2022F00337.md): Damper · departed · Aug 29, 2022 · N152PH · Agusta AW139 > ON A NORMAL APPROACH TO THE H AT THE NORTH RAMP, AT ABOUT 150 AGL, WE SUDDENLY FELT A STRONG VIBRATION. WE PROCEEDED TO LAND AND SHUT DOWN ON THE H (NO TAXI). POST FLIGHT REVEALED THAT ONE TAIL ROTOR DAMPER DEPARTED THE AIRCRAFT. - [SDR QR9R20220609002](https://openairdocs.org/sdr/QR9R20220609002.md): Sleeve · gouged · Jun 9, 2022 · Bolkms BK117C2 > AFTER RECEIVING PART FROM AIRBUS, MAINTENANCE DETECTED THE INNER SLEEVE ASSY WAS GOUGED BEYOND LIMITS. - [SDR QR9R20220405001](https://openairdocs.org/sdr/QR9R20220405001.md): Ballast · damaged · Apr 5, 2022 · Bolkms BK117C2 > WHILE PERFORMING MAINTENANCE TO REPLACE T/R WEIGHTS, T/R WEIGHT STOPPED HALFWAY ON THE FORK WHILE BEING THREADED. INTERNAL THREADS ARE DAMAGED. - [SDR EVCA20210623002](https://openairdocs.org/sdr/EVCA20210623002.md): Support Fitting · seized · Jun 21, 2021 · N239AE · Bell 206L1 > ON THE P/N 206-033-426-001 SUPPORT FITTING ASSY., THE MOUNTING EARS WHICH PROVIDES THE PIVOT POINT FOR T/R CONTROL BELLCRANK P/N 206-001-763-001, WE DISCOVERED THAT THE PIVOT BOLT WAS SEIZED INSIDE THE MOUNT BUSHINGS AND ITS BUSHINGS MOVING WITHIN THE MOUNTIN - [SDR QR9R20210611001](https://openairdocs.org/sdr/QR9R20210611001.md): Bearing · out of tolerance · Jun 11, 2021 · Bolkms BK117C2 > SYSTEMIC AND PREMATURE FAILURE OF THE T/R HEAD SPHERICAL BEARINGS RESULTING IN EXCESSIVE RADIAL PLAY AND TAIL ROTOR VIBRATIONS. - [SDR 2020F00359](https://openairdocs.org/sdr/2020F00359.md): Bearing · worn · Aug 13, 2020 · Bell 206L1 > DURING TAIL ROTOR BALANCE, FEATHER BEARINGS WERE FOUND WORN. BLADES WERE SENT BACK TO MANUFACTURER FOR BEARING REPLACEMENT. DURING INITIAL INSPECTION A DE-BONDED INSPECTION WAS DISCOVERED ON THE SPAR LINE. - [SDR X2RL2020061800001](https://openairdocs.org/sdr/X2RL2020061800001.md): Bearing · seized · Jun 18, 2020 · N717MA · Hughes 369D > PILOT COMPLAINED OF STICKY T/R PEDAL MOVEMENT, FOUND T/R SWASHPLATE PIVOT BEARING SEIZED. REMOVED T/R SWASHPLATE AND SENT IT FOR REPAIR, INSTALLED SERVIVEABLE UNIT. WE HAVE 7 INCIDENTS IN THE LAST YEAR WITH THESE BEARINGS 369A7951-13 SEIZING, ALL UNDER 200 HO - [SDR YV3R2020050900258](https://openairdocs.org/sdr/YV3R2020050900258.md): Elastomer · defective · Apr 28, 2020 · Robsin R44 > CUSTOMER REPORTED BEARING, ELASTOMER P/N: B361-2 HAD A CRACK IN THE RUBBER BETWEEN ELASTOMER AND CASE. - [SDR 2019FA0000414](https://openairdocs.org/sdr/2019FA0000414.md): Trunnion · scored · Nov 20, 2019 · N291HC · Agusta AW109SP > PILOT REPORTED A MAIN ROTOR VIBRATION. UPON TRACK AND BALANCE OF THE MAIN ROTOR IT WAS DISCOVERED THAT THE VIBRATION WAS FROM THE TAIL ROTOR. THIS WAS NOT A COMMON OCCURRENCE AS THE TAIL ROTOR UNDERGOES A DETAILED INSPECTION EVERY 200-HOURS. IT IS VERY UNCOMMO - [SDR YV3R2019101220198](https://openairdocs.org/sdr/YV3R2019101220198.md): Bearing · failed · Oct 3, 2019 · Robsin R44 > CUSTOMER REPORTED TAIL ROTOR PITCH CONTROL P/N: C031-1 HAS ROUGH BEARINGS. - [SDR CA190319022](https://openairdocs.org/sdr/CA190319022.md): Hub · malfunctioned · Mar 18, 2019 · Bell 429 > (CAN) PRIOR TO DELIVERY TO CUSTOMER, THE PILOT NOTICED THE COUPLING TEETH WERE NOT ENGAGED WITH THE YOKE. SHIP HAD FLEW FOR FERRY, TT 11HRS. TRANSMISSION OF POWER MAINTAINED BY FRICTION DUE TO HIGH TORQUE VALUE. - [SDR CA190304021](https://openairdocs.org/sdr/CA190304021.md): Nut · loose · Feb 26, 2019 · Bell 429 > (CAN) DURING PRE-FLIGHT CHECK THE TAILROTOR MAST NUT WAS FOUND LOOSE. AS EVERY MORNING A LICENSED MECHANIC CARRIED OUT THE PRE-FLIGHT CHECK AND FOUND THE DEFECT. IT`S THE SAME MECHANIC WHO CHECKED THE TAIL ROTOR THE DAY BEFORE, AND HE` S 100 PERCENT SURE THAT - [SDR CA190222008](https://openairdocs.org/sdr/CA190222008.md): Hub · damaged · Feb 18, 2019 · Bell 429 > (CAN) IT WAS REPORTED BY BELL: (FLIGHT SAFETY REPORT). AIRCRAFT COMES IN FOR RECONFIGURATION. AT DAILY INSPECTION, EXCESSIVE GAP WAS FOUND BETWEEN HUB AND BLADE ASSEMBLY. (NO TORQUE, HAND-TIGHT). NUT WAS DUE FOR RE-TORQUING AT 200HRS INSPECTION AND SHIP WAS 18 - [SDR 2018FA0000433](https://openairdocs.org/sdr/2018FA0000433.md): Bushing · loose · Sep 10, 2018 · N45BZ · Agusta AW109SP > DURING A WALK AROUND INSPECTION THE TECHNICIAN NOTICED THAT THE ROCKER ARM ASSEMBLY ON THE TAIL ROTOR HUB ASSEMBLY WAS VERY LOOSE. FURTHER INVESTIGATION REVEALED THAT THE BEARING HAD BECOME LOOSE IN THE ROCKER ARM ASSEMBLY. IN THIS APPLICATION THE BEARING IS - [SDR 2018FA0000357](https://openairdocs.org/sdr/2018FA0000357.md): Hub · cracked · Sep 7, 2018 · N5901X · Hynes B2A > INVESTIGATION REVEALED THE TAIL ROTOR AND UPPER TAIL ROTOR GEARBOX ASSEMBLY TO BE MISSING FROM THE PRIMARY ACCIDENT SITE AND WAS LOCATED APPROXIMATELY ONE-HALF MILE AWAY BY THE AIRCRAFT OWNER. THE GEARBOX DRIVE SHAFT WAS SHEARED AND REMAINED WITH THE HELICOPTE - [SDR MKHR2018091300000](https://openairdocs.org/sdr/MKHR2018091300000.md): Bolt · sheared · Aug 8, 2018 · N369MH · Hughes 369D > DURING CRUISE FLIGHT THE PILOT EXPERIENCED AN EXCESSIVE TAIL ROTOR VIBRATION. THE PILOT THEN EXECUTED A PRECAUTIONARY LANDING. WHEN CREW ARRIVED TO INVESTIGATE THE VIBRATION THE INITIAL DISCOVERED WAS THAT THE OUTBOARD TAIL ROTOR FORK BOLT WAS SHEARED. - [SDR JYDR20170324074](https://openairdocs.org/sdr/JYDR20170324074.md): Bracket · missing · Mar 22, 2017 · Skrsky S64E > WHILE CONDUCTING A TAIL ROTOR BALANCE SESSION, BALANCE CHANGED. VISUAL INSPECTION OF THE TAIL ROTOR HEAD SHOWED AN VERNIER BRACKET HAD FALLEN OFF. VISUAL INSPECTION OF THE AREA SHOWED NO OTHER DAMAGE. TAIL ROTOR BALANCED TO WITHIN LIMITS. - [SDR 2A6R2016022201](https://openairdocs.org/sdr/2A6R2016022201.md): Bearing · sheared · Feb 22, 2016 · N911ED · Bell 429 > TAIL ROTOR HUB ASSY, PN: 429-012-101-117, SN: ZC21 WAS REMOVED DUE TO INBD BEARING, PN: 429-3112-103-113 BECAME DELAMINATED CAUSING HUB TO SHIFT WHICH CAUSED ADDITIONAL DAMAGE TO THE HUB ASSY. HUB ASSY WAS SENT TO REPAIR STATION FOR REPAIR. DURING INSPECTION - [SDR 2A6R2016FA0000093](https://openairdocs.org/sdr/2A6R2016FA0000093.md): Bearing · damaged · Feb 22, 2016 · N911NM · Bell 429 > TAIL ROTOR HUB ASSY, PN: 429-012-101-115, SN: ZC19 WAS REMOVED DUE TO INBD BEARING, PN: 429-3112-103-115 BECAME DELAMINATED CAUSING HUB TO SHIFT WHICH CAUSED ADDITIONAL DAMAGE TO THE HUB ASSEMBLY. HUB ASSY WAS SENT TO REPAIR BS FOR REPAIR. DURING INSPECTION - [SDR CA160119009](https://openairdocs.org/sdr/CA160119009.md): Rotor · separated · Oct 15, 2015 · Bell 206L3 > (CAN) ACFT WAS ON AN AERIAL APPLICATION MISSION WHEN IT WAS REQUIRED TO MAKE A FORCED LANDING. INITIAL REPORTS STATE THE TAIL ROTOR SEPARATED FROM THE ACFT. - [SDR CA150922013](https://openairdocs.org/sdr/CA150922013.md): Bearing · damaged · Sep 22, 2015 · Bell 212 > (CAN) DURING THE OVERHAUL OF A TAIL ROTOR ASSY THE NEEDLE BEARING ON THE CONTROL LEVER WAS FOUND TO BE DAMAGED DURING INSTALLATION AT THE FACTORY. WE HAVE CHECK ANOTHER LEVER AND FOUND THE SAME ISSUE. - [SDR CA150501002](https://openairdocs.org/sdr/CA150501002.md): Bearing · worn · Apr 28, 2015 · Bell 429 > (CAN) DURING ROUTINE INSPECTION, EXCESS PLAY OBSERVED IN TAIL ROTOR PITCH LINK. ATTACHED VIDEO SHOWS THE PRESENT CONDITION. - [SDR CA150327013](https://openairdocs.org/sdr/CA150327013.md): Nut · cracked · Mar 24, 2015 · Bell 206B > (CAN) DURING A SCHEDULED TAIL ROTOR REMOVAL AME WENT TO REMOVE THE TAIL ROTOR CROSSHEAD, 206-011-857-001. RETAINING NUT AND THERE WAS NO TORQUE, AND THOUGH STRANGE, IT WAS CRACKED RIGHT AT THE SLOT. - [SDR CA150204012](https://openairdocs.org/sdr/CA150204012.md): Bearing · dislodged · Jan 27, 2015 · Bell 429 > (CAN) DURING PREFLIGHT, PILOT NOTICED BEARING DISLODGED FROM LINK. PILOT STATES THE LINK WAS NOT LIKE THAT THE PREVIOUS DAY DURING PREFLIGHT. - [SDR CA150127002](https://openairdocs.org/sdr/CA150127002.md): Bearing · worn · Jan 22, 2015 · Bell 429 > (CAN) T/R P/C LINK BEARING, LINK, AND BEARING FAILURE OF A 429 T/R P/C LINK BEARING, LINK PN 429-012-112-101, BEARING, PN 429-312-107-103 ON. ALONG WITH THE DAMAGE TO THE LINK WAS DAMAGE TO THE ASSOCIATED PITCH HORN AND PITCH HORN BUSHING. WE HAVE REVISED - [SDR 2014FA0000669](https://openairdocs.org/sdr/2014FA0000669.md): Nut · corroded · Nov 14, 2014 · Bell 206A > CORROSION EXCESSIVE IN THE MAST BEARING RETAINING NUT AREA. AREA J IN THE MFG CR&O MANUAL. - [SDR 2A6R201411201572](https://openairdocs.org/sdr/2A6R201411201572.md): Elastomer · failed · Nov 14, 2014 · N911KX · Bell 429 > TR FLAPPING BEARING ELASTOMER FAILURE & DELAMINATION AT 1054.25 HOURS. SLL IS 15,000 HOURS. - [SDR CA141023007](https://openairdocs.org/sdr/CA141023007.md): Bearing · making metal · Oct 6, 2014 · Hughes 269C1 > (CAN) THE ROTOR SYS WAS FOUND TO BE INCREASING IN VIBRATION. CHECKED THROUGH THE SYSTEM AND FOUND THE BEARINGS WHEN PURGED OF GREASE WERE SHOWING FINE METAL PARTICLES. CARRIED OUT A WEIGHTED ROTATIONAL TEST ON PITCH HOUSINGS AND FOUND THE BEARINGS TO BE A BI - [SDR CA140908028](https://openairdocs.org/sdr/CA140908028.md): Yoke · unserviceable · Sep 4, 2014 · Bell 412EP > (CAN) DURING THE DAILY INSPECTION IT WAS NOTICED THAT 1 TAIL ROTOR YOKE FEATHERING BEARING OUTER RACE STAKE HAD FAILED. UPON FURTHER INVESTIGATION ALL 4 TAIL ROTOR YOKE FEATHERING BEARING OUTER RACE STAKES HAD FAILED. - [SDR CA140626002](https://openairdocs.org/sdr/CA140626002.md): Shaft · worn · Jun 25, 2014 · Snias AS350BA > (CAN) WHEN THE TAIL ROTOR WAS ROTATED CLOCKWISE OR COUNTER CLOCKWISE, A NOISE WAS DETECTED. AFTER INVESTIGATION, IT WAS DISCOVERED THAT A PLAY EXISTED AT THE ASSY POINT OF THE FRONT SHAFT AND THE FRONT FLANGE. - [SDR 3GMA2014052801](https://openairdocs.org/sdr/3GMA2014052801.md): Bearing · unstaked · May 16, 2014 · N482LF · Bolkms BK117C2 > ON A PREFLIGHT INSPECTION, FOUND BEARING OF TAIL ROTOR PITCH LINK UNSTAKED & LOOSE IN PITCH LINK. - [SDR CA140325006](https://openairdocs.org/sdr/CA140325006.md): Bearing · misinstalled · Mar 24, 2014 · Bell 206L4 > (CAN) THE FEATHERING BEARING WAS STAKED FAR TOO TIGHT. CAUSING RESTRICTION ON TAIL ROTOR CONTROL. THIS WAS NOTED ON A PRE FLIGHT POST MAINTENANCE INSPECTION. THE BLADE ARE THE VAN HORN BLADES INSTALLED UNDER STC SH10-22. ASSY REMOVED AND NEW ASSEMBLY INSTALL - [SDR CA140127001](https://openairdocs.org/sdr/CA140127001.md): Bolt · sheared · Jan 24, 2014 · Bell 206L4 > (CAN) IN FLIGHT PILOT COULD FEEL VIBRATION IN THE AIRFRAME, DECIDED TO LAND. ENGINEER INSPECTED AIRFRAME INCLUDING REMOVAL OF DRIVESHAFT COVERS AND COWLS AS REQUIRED AND A DETAILED INSPECTION OF THE TAIL ROTOR AND DRIVE SYS ACCOMPLISHED. A TEST FLIGHT WAS AC - [SDR CA140109003](https://openairdocs.org/sdr/CA140109003.md): Plug · leaking · Dec 18, 2013 · Bell 206L4 > (CAN) ACFT HAD JUST DEPARTED FROM AN OFFSHORE PLATFORM WHEN THE T/R PEDALS LOCKED UP AT APPROXIMATELY MID-TRAVEL. PILOT CONTINUED ON AND MADE AN UNEVENTFUL EMERGENCY LANDING. AT THIS TIME, T/R FLAPPING BEARINGS ARE SUSPECT, BUT INITIAL INSPECTION HAS REVEALED - [SDR CA131118028](https://openairdocs.org/sdr/CA131118028.md): Slip Ring · failed · Nov 18, 2013 · Agusta AW139 > (CAN) DURING A 50HR BY-WEEKLY INSPECTION, ENGINEER DISCOVERED THAT THE DUPLEX BEARING IN THE TAIL ROTOR SLIP RING HAD DETERIORATED BEYOND ACCEPTABLE LIMITS. - [SDR CA131107007](https://openairdocs.org/sdr/CA131107007.md): Rod · cracked · Nov 7, 2013 · Snias AS350BA > (CAN) DURING A VISUAL INSPECTION, A CRACK WAS FOUND AT THE AFT END OF THE TAIL ROTOR ACTUATING ROD, WHERE THE BEARING IS SWAGED. - [SDR CA131114002](https://openairdocs.org/sdr/CA131114002.md): Pitch Horn · damaged · Oct 24, 2013 · Bell 206B > (CAN) RAISED CENTER LUG OF PITCH HORN FOULING ON YOKE. BOLT HOLES FOR HORN ATTACHMENT AND WASHER WEIGHTS MIS-LOCATED APPROXIMATELY.05". NO PN OR SN VISIBLE, HOWEVER A ETCHED HEAT CODE " HT617A " CAN BE SEEN. - [SDR CA131002009](https://openairdocs.org/sdr/CA131002009.md): Slip Ring · failed · Oct 1, 2013 · Agusta AW139 > (CAN) DURING A POST FLIGHT WALK AROUND, FROM A 1 HR FLT, IT WAS NOTED THE FIPS WIRING ON THE TAIL ROTOR WAS DAMAGED. INSPECTION REVEALED THAT THE SLIP RING ASSY HAD SEIZED CAUSING THE DRIVE PIN TO SHEAR THE DRIVE LINKS AND ALSO CAUSED THE 4 WIRING BUNDLES TO - [SDR CA130820004](https://openairdocs.org/sdr/CA130820004.md): Bolt · sheared · Aug 15, 2013 · Bell 204B > (CAN) DURING CRUISE FLIGHT, THE ACFT DEVELOPED A SUDDEN AND SEVERE VIBRATION. THE PILOT IMMEDIATELY LANDED AND SHUTDOWN. INSPECTION OF THE ACFT SHOWED THE INBD BOLT SECURING TAIL ROTOR PITCH LINK TO THE TAIL ROTOR GRIP HAD SHEARED AND THE TAIL ROTOR BLADES H - [SDR CA130809008](https://openairdocs.org/sdr/CA130809008.md): Bearing · worn · Aug 8, 2013 · Snias AS350B2 > (CAN) FOUND TAIL ROTOR HALF MOON BEARINGS WEARING QUICKLY OVER SEVERAL DAILY INSPECTIONS IN AREAS REFERENCED IN DOCUMENT AMM 64-10-00, 6-1B SECTION 10 AND FIGURE SHEET 04, DETAIL H CONCERNING LAMINATED BEARINGS. SEPARATION ALONG THE INBD BONDING AREA EVIDENT - [SDR CA130813005](https://openairdocs.org/sdr/CA130813005.md): Bearing · cracked · Aug 2, 2013 · Snias AS350B2 > (CAN) TAIL ROTOR HALF SHELL BEARINGS CONSIST OF 4 SEPARATE BEARINGS TO MAKE 1 SET. 2 OF THE 4 BEARINGS WERE FOUND WITH CRACKS THAT EXTENDED AROUND A CORNER OF THE RUBBER AND CONTINUED ALONG THE OTHER EDGE AND THE CRACKS WERE BEYOND ALLOWABLE LIMITS. THE HALF Next page: https://openairdocs.org/jasc/6420/reports.md?page=2 ## 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 jasc_code = '6420' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/jasc/6420/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.