JASC 6121

Service difficulty reports · 37

Reports filed under 6121 · Propeller Synchronizer Section, newest first.

Query with SQL
duckdb -csv -c "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 = '6121'
  ORDER BY difficulty_date DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

SDR LR7A2025041303753Synchrophaser · inoperativeDURING SCHEDULED FLIGHT #1 ENGINE RPM FLUX OUT OF LIMITS, ENGINE SHUTDOWN @2205Z IAW QRH / REMOVED AND REPLACED PROP SYNCHROPHASER REF: HAMILTON SUNDSTRAND 5059 CH.2, SECTION IV, OPS CHECK GOOD IAW HN7101. LOG PAGE #53955Apr 13, 2025 · N407LC · Lkheed 382GSDR CA130822009Module · inoperative(CAN) NR 1 ENGINE HAS DRAMATIC RPM FLUCTUATIONS IN ALL BUT THE "OFF" SETTING IN THE SYNC SYSTEM.Aug 19, 2013 · Cvac 340CVACSDR QMLA2013041713054Screw · missingON FLIGHT, HAD PROPS SYNCED DURING CRUISE, TURNED PROP SYNC SYS ON AND PROPS WENT OUT OF SYNC. TURNED PROP SYNC OFF AND CONTINUED WITH PROPS SYNCED MANUALLY. UPON LANDING MECHANIC FOUND MISSING SCREW OF PROP SYNC SYS.Apr 17, 2013 · N912SM · Beech 200BEECHSDR CA111117026Control Box · faulted(CAN) DURING A ROUTINE FLIGHT, IT WAS NOTED THE PROPELLERS WOULD NOT SYNCHRONIZE, THE PROPS WHERE SYNCHRONIZED MANUALLY AND THE FLIGHT CONTINUED WITHOUT COMPLICATIONS. MAINTENANCE FOUND A FAULTY PROPELLER SYNC CONTROL BOX, IT WAS R & R, THE SYSTEM GROUND FUNCOct 28, 2011 · Beech B200SDR MASA2011032402233Switch · jammedPROP SYNC SWITCH JAMMED. MX R2 PROP SYNC SWITCH.Mar 21, 2011 · N989HA · Dhav DHC8202SDR NSVA2010169Syncronizer · malfunctionedRETURNED TO FLIGHT DUE TO RIGHT ENGINE TORQUE FLUX. FOUND FLUX TO BE ONLY WITH PROP SYNC ON. PLACED PROP SYNC ON MEL.Sep 20, 2010 · N341CJ · Saab 340BSDR CA090615011Module · burned out(CAN) SEVEN MINUTES FROM AIRPORT, CREW NOTICED SMOKE COMING FROM ELECTRICAL BAY. WITH NO SYSTEMS FAILED, THE CREW RETURNED TO DEPARTURE WITH NO INCIDENTS. MX FOUND NR 1 PROP PHASE SYNC MODULE HAD BURNED OUT. ALL ACFT WIRES WERE CHECKED OUT TO BE OK, THE SYS Jun 13, 2009 · Lkheed 188ASDR SWIA200819594Connector · contaminatedFLT 3605 - RIGHT PROP NP WAS FLUCTUATING IN FLIGHT. INSPECTED AND CLEANED OIL FROM RIGHT PROP SYNC PICK-UP SENSOR CONNECTOR. OPS CHECK GOOD IAW EMB 120 MM 61-24-00. May 5, 2008 · N236SW · Emb EMB120ERSDR HNAA0800031Pcu · defectiveNR 2 PROPELLER FLUX OF 20 RPM ASSOCIATED WITH TORQUE FLUX OF 6%, RETURNED TO FIELD, PROPELLER SYNC OFF AT TIME OF FLUX, CYCLED PROPELLER SYNC DURING FINAL AND SURGE SELF CORRECTED AND ENGINES OPERATE NORMAL. GROUND RAN AT TAKEOFF POWER, COULD NOT DUPLICATE DIJan 9, 2008 · N828EX · Dhav DHC8102SDR CA060424008Shaft · brokenFLIGHT CREW REPORTED EXCESS BACKLASH AND PROP SYNC DOES NOT SYNC. PROP WANDERING + - 5 TO 7 RPM. ENGINE SPRING STRUT ASSEMBLY REPLACED. AFTER DISASSEMBLY IN THE O/H SHOP, SHAFT P/N 87620130-101 WAS FOUND BROKEN AT POINT RIVET P/N MS204170AD3. THE SIZE OF THApr 21, 2006 · Dhav DHC8301SDR HNAA0400109Wire Harness · chafedFLIGHT NR 3822 HAD TO RETURN TO FIELD DUE TO THE RT PROP RPM SURGING ON CLIMB OUT. AIRCRAFT LANDED WITHOUT INCIDENT. CONDITION DID NOT EXIST WITH THE PROP SYNCHROPHASER OFF. MAINTENANCE TROUBLESHOT SYSTEM AND FOUND CHAFED WIRES AT THE ENGINE HARNESS FOR THE SYAug 10, 2004 · N835EX · Dhav DHC8102SDR 364032Switch · sparksWHEN THE NR 2 FLIGHT DIRECTOR PITCH SYNC BUTTON WAS PUSHED IT CAUSED ELECTRICAL SPARKS. REMOVED AND REPLACED NR 2 FLIGHT DIRECTOR PITCH SYNC BUTTON, SPARKS WHERE CAUSED BY LOOSE BUTTON WHICH SHORTED AGAINST YOKE.Dec 30, 2003 · N172MJ · Beech 1900DSDR BAQA090685Actuator · failedACTUATOR WILL NOT CENTER IN ONE DIRECTION. REPLACED WITH SERVICEABLE UNIT. 11/11/03Nov 10, 2003 · N999G · Beech 100BEECHSDR BAQA090299Synchrophaser · inoperativePROPELLER SYCHROPHASER INOPERATIVE. REPLACED WITH SERVICEABLE UNIT.Oct 23, 2003 · N999G · Beech 100BEECHSDR J7B2003F00001Coil · separatedON TAKE OFF THE RT ENGINE FEATHERED. INSPECTION REVEALED PROPELLER SYNCROPHASER COIL HAD BECOME SEPARATED FROM THE GOVERNOR BODY, CAUSING THE PROPELLER TO FEATHER. THE ATTACHING STUDS ON THE COIL HAD SHEARED AND BECAME BOUND UP WITH THE FLYWEIGHT ASSY. PULLOct 10, 2003 · N421GF · Cessna 421CSDR CA020722012Housing · failed(CAN) ENROUTE YUX FROM YUW NR 4 ENGINE WOULD NOT SYNC. PRECAUTIONARY ENGINE SHUTDOWN CARRIED OUT. MAINTENANCE REPLACED THE PROP VALVE HOSUING. THE AIRCRAFT WAS GROUND CHECKED SERVICEABLE BEFORE RETURN TO SERVICE.Jul 11, 2002 · Lkheed 382GSDR SIMA0252Warning Light · malfunctionedLAX - FLT 3057 - CREW ABORTED TAKEOFF DUE TO RIGHT AUTOMATIC POWER RESERVE LIGHT DID NOT ILLUMINATE. CREW ALSO REPORTED LEFT PROPELLER RPM LAGS BEHIND THE RIGHT. MAINTENANCE COULD NOT DUPLICATE DISCREPANCY. OPERATIONAL CHECK OF APR SYSTEM WAS COMPLIED WITH Jan 25, 2001 · N250AE · Saab 340BSDR 20010112SG046Switch · shortedPROP SYNC SWITCH SHORTED CAUSING ELECTRICAL SMOKE IN COCKPIT. PULLED PROP SYNC CIRCUIT BREAKER AND SMOKE CLEARED. PROP SYNC SYSTEM DEACTIVATED AND DEFERRED PER MEL 61-1 PENDING RECEIPT OF SWITCH. REPLACED SWITCH AND TESTED SYSTEM. NO DISCREPANCIES NOTED. Dec 12, 2000 · N228GL · Beech 1900DSDR 20010112SG023Switch · shortedTHE PROPELLER SYNCHORNIZATION SWITCH SHORTED, RESULTING IN SMOKE IN THE COCKPIT. REPLACED THE PROPELLER SYNCHORNIZATION SWITCH. OPS CHECKED GOOD. (M)Nov 29, 2000 · N228GL · Beech 1900DSDR 20010111SG008Switch · shortedPROP SYNC SWITCH SHORTED CAUSING ELECTRICAL SMOKE IN THE COCKPIT. PULLED PROP SYNC CIRCUIT BREAKER AND SMOKE CLEARED. PROP SYNC SYSTEM DEACTIVATED AND DEFERRED PER MEL 61-1 PENDING RECEIPT OF SWITCH. (M)Oct 16, 2000 · N228GL · Beech 1900DSDR COMA0010315Pickup · out of adjRIGHT HAND ENGINE NP OSCILLATING 99 T 102.8 PERCENT. ADJUSTED PROP SYNC. PULSE PICKUP GAPS TO M/M SPECIFICATIONS.Aug 6, 2000 · N258CA · Emb EMB120RTSDR VNAA0007003Switch · failedDURING CLIMBOUT, THE CREW RECEIVED A LEFT HAND PROPELLER OIL PRESSURE CAS MESSAGE. THE CREW FOLLOWED THE QUICK REFERENCE HANDBOOK AND CONTACTED MAINTENANCE CONTROL WHO INSTRUCTED CREW TO RETURN TO PIT. FLIGHT 4171 LANDED WITHOUT FURTHER INCIDENT. MAINTENANCJul 4, 2000 · N437JS · Dorner DO328100SDR CA000712031Hub · corroded(CAN) PROPELLER RECEIVED FOR CORROSION INSPECTION. (X)Jun 23, 2000 · Cessna 172DSDR VNAA0004012Pcu · failedWHILE CLIMBING THROUGH FLT 020, THE CREW RECEIVED AN INTERMITTENT RIGHT HAND PROPELLER LOW OIL PRESSURE CAS MESSAGE. REACHING FLT 100 THE MESSAGE REMAINED CONSTANT, THE CREW DECIDED TO RETURN TO THE FIELD. THE AIRCRAFT WAS FERRIED TO AKRON WHERE MAINTENANCE Apr 6, 2000 · N426JS · Dorner DO328100SDR C2XA99CL128Switch · failedCLE - FLT 3134 - AFTER TAKEOFF FROM CLE, LEFT AUTOFEATHER ADVISORY (GREEN) LIGHT AND REPEATER (AFX) FAILED TO ILLUMINATE. AIRCRAFT RETURNED TO CLE WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED NR 1 ENGINE LOW PRESSURE AUTOFEATHER SWITCH IAW BEECDec 17, 1999 · N81553 · Beech 1900DSDR HEEA063064Syncrophaser · erraticPROPELLER SYNC ERRATIC.Aug 12, 1999SDR MASA99084Switch · looseFLT 1031 - ABQ-ROW - EN ROUTE TO ROW,THE CREW REPORTED WHEN THE CO-PILOT PUSHED HIS PATCH SYNC SWITCH THE CIRCUIT BREAKER FOR THE FLIGHT DIRECTOR POPPED AND A SMALL AMOUNT OF SMOKE CAME FROM THE SWITCH. THE AIRCRAFT LANDED IN ROW WITHOUT INCIDENT. THE AIRCRAMay 26, 1999 · N2YV · Beech 1900DSDR SWIA971259Synchronizer · malfunctionedPROP SYNC CAUSES 3 PERCENT NP FLUCTUATION ON RIGHT PROPELLER. RETURNED TO LAX, MEL 61-24-1. REPLACED PROP SYNCHROPHASER IAW MM 61-24-01, OPS CHECKS GOOD.Sep 3, 1998 · N226SW · Emb EMB120ERSDR SWIA971237Prop Synch · malfunctionedRIGHT ENGINE STARTED SURGING, TQ FLUCTUATIONS AT 9,000 FT. RETURNED TO LAX. TQ FLUCTUATING CONTINUED AS MUCH AS 10 PERCENT. TURNED OFF EEC PER QRH WITH NO CHANGES. NOTIFIED LAX MX. DECLARED EMERGENCY VIA ATC FOR ENGINE SURGING. DID NOT SHUT DOWN ENGINE. Aug 5, 1998 · N289YV · Emb EMB120RTSDR 98ZZZM639Actuator · failedPROPELLERS WILL NOT SYNC IN K1 POSITION. RIGHT 13500 RPM, LT 14,000 RPM AND RISING. PITCH LOCKED PROPELLER, RPM STILL UNSTABLE. E-HANDLED LT ENGINE AND MADE UNEVENTFUL LANDING AT ANC. REPLACED LT ROTARY ACTUATOR AND REPAIRED BROKEN WIRE TO RT PROP ALTERNATJul 17, 1998 · N566EA · Cvac 440SDR AU980579Actuator · failed(AUS) LT PROPELLER SYNCHRONIZATION SYSTEM FAILED. PROPELLER CONTROL ACTUATOR FULLY WOUND ONE WAY PREVENTING THE GOVERNOR ARM FROM REACHING THE MAXIMUM RPM STOP.May 28, 1998 · Stbros SD360SDR 96ZZZX3540Control Box · shortedDURING CRUISE FLIGHT, SMOKE FILLED THE CABIN. ELECTRICAL POWER WAS TURNED OFF. SMOKE CLEARED FROM CABIN. INVESTIGATION REVEALED THE PROPELLER SYNCROPHASER CONTROL BOX HAD SHORTED AND EMITTED SMOKE. THE NUTS THAT HOLD THE CANNON PLUG PINS HAD VIBRATED OFF AJun 21, 1996 · N6221C · Cessna 340ASDR HEEA967054Actuator · failedPROP SYNC INOPERATIVE.Apr 18, 1996 · N30PH · Beech 200BEECHSDR CA960123011Connector · crimp failed(CAN)DURING TROUBLESHOOTING OF THE PROPELLER SYNCHROPHASER SYSTEM, WIRES WERE FOUND PULLED OUT OF THE SYNCHROPHASER BOX CONNECTOR. WHEN THE SOCKETS WERE EXTRACTED FROM THE BOX THEY COULD BE SEEN TO BE IMPROPERLY CRIMPED. THERE WAS ALSO NO STRAIN RELIEF BACKSHEJan 5, 1996 · Beech B200CSDR 96ZZZX3976Sync Actuator · failedPROPELLER SYNCHRONIZATION INOPERABLE. PROPELLER SYNCHRONIZATION ACTUATOR NOT RETURNING THE PROPELLER GOVERNOR INPUT DRIVE TO THE CENTER WHEN PROPELLER SYNC WAS SWITCHED OFF.Nov 20, 1995 · N711PK · Stbros SD360SDR 95ZZZX6059Actuator · pin shearedPILOT EXPERIENCED RAPID RPM INCREASE ON THE RIGHT ENGINE WHEN PROP SYNC ENGAGED. PILOT THEN SHUT OFF PROP SYNC AND CONTROLLED RPM MANUALLY, BUT REPORTED THE RIGHT PROP LEVER TO BE OUT OF RIG WITH THE LEFT AND WOULD NOT GO FULL TRAVEL. INVESTIGATION REVEALED Oct 10, 1995 · N1950G · Cessna 421BSDR COMA9531165Governor · defectiveLT PROPELLER RPM DROPS TO 1370 DURING FINAL APPROACH. REPLACED THE PROPELLER OVERSPEED GOVERNOR.Sep 26, 1995 · N320CA · Saab SF340A
Back to JASC 6121