# Service difficulty reports: Mooney M20M

A list on [Mooney M20M](https://openairdocs.org/model/mooney-m20m.md).

Newest first. General aviation reporting is voluntary.

- [SDR 2026FA0000612](https://openairdocs.org/sdr/2026FA0000612.md): Spark Plug · cracked · Jul 30, 2026 · N530JP · Mooney M20M · Spark Plug/Igniter
  > SPARK PLUGS, TEMPEST: UPON REMOVAL, 4 OF THE 12 SPARK PLUGS, FOUND TO HAVE CIRCUMFERENTIAL CRACKS IN STEEL SHELL, LOCATED IN REDUCED ALL HOT CRIMP (SWAGE) SECTION BETWEEN THE MOUNTING GASKET SEAT & WRENCHING HEX. CRACKS ARE JAGGED & IRREGULAR, EXTEND AROUND A
- [SDR 2017FA0000644](https://openairdocs.org/sdr/2017FA0000644.md): Connector · burned · Dec 14, 2017 · N1012C · Mooney M20M · Instrument System Wiring
  > AIRCRAFT CAME IN FOR ANNUAL INSPECTION WITH PILOT-REPORTED DISCREPANCY OF AVIONICS FAN CIRCUIT BREAKER INTERMITTENT TRIPPING AND #2 ALTERNATOR INTERMITTENT FAULT LIGHT. DURING PRELIMINARY SYSTEMS CHECK IT WAS DISCOVERED THAT THE AVIONICS FAN CIRCUIT BREAKER WO
- [SDR 2013FA0000628](https://openairdocs.org/sdr/2013FA0000628.md): Spar Cap · corroded · Nov 7, 2013 · N321EH · Mooney M20M · Wing Spar
  > DURING INSPECTION, SEVERE INTERGRANULAR CORROSION HAS BEEN FOUND IN TWO PLACES ON THE UPPER MAIN SPAR CAP.
- [SDR 2013FA0000252](https://openairdocs.org/sdr/2013FA0000252.md): Mount · chafed · Apr 26, 2013 · N26JR · Mooney M20M · Engine Mount Section
  > LOWER ENGINE MOUNT TUBE BETWEEN THE LOWER AFT MOUNTS WAS CHAFED APPROX HALFWAY THROUGH. INSPECTION REVEALED THAT AN OIL LINE ON THE BOTTOM REAR ENGINE THAT WAS ROUTED BETWEEN THE MOUNT AND THE FUEL CONTROL UNIT WAS THE CAUSE OF THE CHAFING. THERE IS SO LITTLE
- [SDR 2009FA0001032](https://openairdocs.org/sdr/2009FA0001032.md): Nut · loose · Sep 30, 2009 · N67TF · Mooney M20M · Landing Gear Retraction/Extension System
  > DURING ANNUAL INSP THE ACFT WAS JACKED AND LANDING GEAR TESTED. EMERGENCY ESTENSION SYS TESTED. FOUND LOOSE NUT. FINGER TIGHT ONLY AT PULLEY WITHIN BELLY AREA FOR EMERGENCY EXTENSION SYSTEM PULL CABLE. ANA-7A BOLT, AN960-10L WASHER AND AN363-428 NUT. TORQ
- [SDR OMKR2009-0001](https://openairdocs.org/sdr/OMKR2009-0001.md): Clamp · cracked · Feb 17, 2009 · N17RA · Mooney M20M · Exhaust Turbocharger
  > TURBOCHARGER V BAND CLAMP PN NH1009399-10/40D23255-340M FOUND CRACKED.7500 THRU OUTER STRAP. AD2004-23-17, EFF. DATE 12/1/2004 CALLS FOR REPLACEMENT OF THIS CLAMP. THIS IS THE NEW STYLE CLAMP THAT WAS FOUND CRACKED. CLAMP OUTER STRAP CRACK IS WITHIN.1250
- [SDR 2006FA0000547](https://openairdocs.org/sdr/2006FA0000547.md): Exhaust Riser · cracked · Jun 2, 2006 · N223KT · Mooney M20M · Engine Collector/Tailpipe/Nozzle
  > CUSTOMER SENT IN THE EXHAUST SYSTEM BECAUSE OF CRACKS FOUND IN THE WELDS OF THE RISER LEGS TO THE STACK TUBES OF THE NR 1 AND NR 2 SECTIONS. ADVISED CUSTOMER TO REPLACE COMPONENTS. CUSTOMER BOUGHT NEW PARTS AND BROUGHT THEM IN TO HAVE ATTACHING PIECES INSTALL
- [SDR 2006FA0000048](https://openairdocs.org/sdr/2006FA0000048.md): Plug · dislodged · Dec 30, 2005 · N22320 · Mooney M20M · Reciprocating Engine Power Section
  > DURING PROP REMOVAL FOR A GROUND STRIKE, FOUND CRANKSHAFT WELSH PLUG LOGGED IN THE PROP HOUSING, RESTRICTING OIL FLOW TO PROP. ENGINE HAD BEEN INSTALLED 30 DAYS EARLIER, 4 HOURS SINCE INSTALL. (K)
- [SDR 2006FA0000085](https://openairdocs.org/sdr/2006FA0000085.md): Volt Regulator · failed · Oct 13, 2005 · N9145X · Mooney M20M · DC Regulator
  > COMBINATION VOLTAGE AND OVERVOLTAGE REGULATOR FAILED. THIS FAILURE CAUSED A VOLTAGE SPIKE IN THE ELECTRICAL SYSTEM WHICH IN TURN DAMAGED ALL OF THE COM AND NAV RADIOS, THE ANNUNCIATOR PANEL, AND NUMEROUS COMPUTER RELATED AVIONICS ITEMS. MULTIPLE LIGHT BULBS
- [SDR 5322](https://openairdocs.org/sdr/5322.md): Wire · overheated · Apr 11, 2005 · N21816 · Mooney M20M · Air Conditioning System Wiring
  > AVIONICS BLOWER AND COWL FLAP BREAKER POPPED IN FLIGHT, UNABLE TO RESET. LANDING AND TAXI CIRCUITS DRAW 18 AMPS EACH AND WERE ROUTED THROUGH CIRCUIT BREAKER DISCONNECT WITH CONTACT RATING OF 13 AMPS EACH. THE OVERHEATED CONNECTION MELTED INSULATION ON SURROUND
- [SDR 2005FA0000680](https://openairdocs.org/sdr/2005FA0000680.md): Bellcrank · cracked · Jan 29, 2005 · N1085K · Mooney M20M · Flight Compartment Equipment
  > PILOT SEAT HEIGHT ADJUST BELL CRANK CRACKED AND SPLIT OPEN ON RT SIDE. THIS CAUSED SEAT TO LEAN DOWN TO THE RT. CRACK APPEARS TO START AT A WELD ON THE END OF THE TUBE. CRACK CONTINUED IN SPIRAL TOWARD ACTUATOR ATTACH POINT. OPPOSITE END OF TUBE BENT AND B
- [SDR 2004FA0000823](https://openairdocs.org/sdr/2004FA0000823.md): Clutch Spring · failed · Sep 8, 2004 · N716PR · Mooney M20M · Landing Gear Retraction/Extension System
  > LANDING GEAR ACT CYCLED ON AND OFF AT 5-10 SECOND INTERVALS IN DOWN POSITION. FOUND NO-BACK CLUTCH SPRING (SLIPPING) WHEN GEAR WAS UNDER PRELOAD IN DOWN OR UP POSITION. SB M20-282 AND SI 102000-1-901 REV2, INSTALLING NEW NO-BACK CLUTCH SPRING, MECHANISM WAS
- [SDR 2004FA0000822](https://openairdocs.org/sdr/2004FA0000822.md): Clutch Spring · missing · Sep 8, 2004 · N2231X · Mooney M20M · Landing Gear Actuator
  > AFTER COMPLIANCE WITH SB M20-282 AND THE CORRESPONDING SI 102000-1901 REV 2 THE NO-BACK CLUTCH SPRING MECHANISM WAS ALLOWING THE ACTUATOR TO (BACK UP) UNDER NORMAL LOADS. IT WAS FOUND THAT EXCESSIVE FRICTION BETWEEN THE INPUT/DRIVE GEAR ASSY AND THE OUTPUT/DR
- [SDR 2004FA0000821](https://openairdocs.org/sdr/2004FA0000821.md): Shaft · misinstalled · Sep 8, 2004 · N2231X · Mooney M20M · Landing Gear Actuator
  > GEAR ACTUATOR (CHATTERED) DURING LANDING GEAR RETRACTION CYCLES. FOUND APPROX.020 INCH END PLAY ON DRIVE GEAR ASSY SHAFT. INSPECTION OF RELATED PARTS REVEALED NO EXCESSIVE WEAR. IT APPEARS THAT WITH ONLY 632 HRS TSI ON THE ACTUATOR (WHICH HAS NEVER BEEN PR
- [SDR 535062004](https://openairdocs.org/sdr/535062004.md): Control Cable · obstructed · Jul 2, 2004 · N12XL · Mooney M20M · Crew Oxygen System
  > A RIVE NUT ON THE BRACKET HOLDING THE O2 CONTROL CABLE HAS CAUSED THE O2 CONTROL TO FAIL TO REACH ITS (FULL ON) POSITION. IF THE O2 CONTROL CABLE IS NOT SET AT (FULL ON) OR (FULL OFF) (IN OTHER WORDS, WHEN THE CONTROL IS IN-BETWEEN EITHER SETTING) THERE IS A
- [SDR 2003FA0001019](https://openairdocs.org/sdr/2003FA0001019.md): Rod End · broken · Aug 13, 2003 · N2171Q · Mooney M20M · Ailerons
  > PLANE CAME IN FOR ANNUAL. CUSTOMER REPORTED AILERON CONTROL STIFF. UPON MOVING YOKE TO CONFIRM STIFFNESS. RT AILERON ROD END AT AILERON BROKE. IT BROKE WHERE THREADED PORTION MEETS BEARING. REMOVED ROD END AND FOUND BEARING WAS FROZEN. ALL MOVEMENT WAS IN THE
- [SDR CA031103007](https://openairdocs.org/sdr/CA031103007.md): Engine · making metal · Nov 28, 2002 · Mooney M20M · Reciprocating Engine Cylinder Section
  > (CAN) FOUND METAL CONTAMINATION ON OIL FILTER ELEMENT. MFG LAB REPORTS METAL AREA MS 6274 STEEL LIKELY FROM CAMSHAFT AND AMS 4280 ALUMINUM FROM CRANKCASE. ENGINE WAS REMOVED AS PRECAUTIONARY INVESTIGATION DUE TO SIMILAR METAL CONTAMINATION AND REPAIR ABOUT 1
- [SDR CA030110003](https://openairdocs.org/sdr/CA030110003.md): Pivot Assy · seized · Jul 18, 2002 · Mooney M20M · Landing Gear Retraction/Extension System
  > (CAN) THE LT MLG HAD FAILED TO EXTEND. UPON EXAMINATION IT WAS FOUND THAT THE HINGE PIVOT POINT BETWEEN THE SHOCK STRUT AND GEAR LEG SPINDLE ASSEMBLY WAS SEIZED DUE TO A LACK OF LUBRICATION. THIS CAUSED THE MLG LEG TO RETRACT IMPROPERLY AND JAMMED IN THE WHE
- [SDR 2002FA0000646](https://openairdocs.org/sdr/2002FA0000646.md): Bearing · failed · Feb 25, 2002 · N355RZ · Mooney M20M · Engine (Reciprocating)
  > DURING REGULARLY SCHEDULED OIL CHANGE AT 399.5 HRS, UPON EXAM OF OIL FILTER, METAL CONTAMINATES WERE DISCOVERED IN THE ELEMENT FOLDS. CONTACTED MFG, ADVISED THERE WAS A SERVICE INSTRUCTION THAT PERTAINED TO THIS ENGINE THAT OUTLINES INSPECTION PROCEDURE FOR O
- [SDR 2002FA0000317](https://openairdocs.org/sdr/2002FA0000317.md): Bearing · failed · Feb 25, 2002 · N355RZ · Mooney M20M · Reciprocating Engine Power Section
  > DURING A REGULER OIL CHANGE INTERVAL. METAL CONTAMINATS WER NOTED IN THE FOLDS OF THE OIL FILTER. THEY APPEARED TO BE OF ALUMINUM. FURTHER INVESTIGATION INTO THE PICK UP SCREEN FOUND A LARGER AMOUNT OF DEBRIS. SIZE OF THE DEBRIS APPEARED TO BE AROUND 1/16 OF A
- [SDR 2001FA0000178](https://openairdocs.org/sdr/2001FA0000178.md): Actuator · failed · Jun 11, 2001 · N321JL · Mooney M20M · Landing Gear Actuator
  > ACTUATOR FAILED BOTH MANUALLY AND ELECTRICALLY RESULTING IN A GEAR UP LANDING.
- [SDR 20000721SH015](https://openairdocs.org/sdr/20000721SH015.md): Spinner · cracked · Jul 5, 2000 · N10KG · Mooney M20M · Propeller Spinner Section
  > FOUND SPINNER BULKHEAD SEVERELY CRACKED DURING ROUTINE MAINTENANCE. SUBMITTER STATED THIS IS THE SECOND M20M WITH LESS THAN 500 HOURS THAT THE BULKHEAD HAS FAILED. SPINNER BULKHEAD HAS CRACKS AT ATTACHEMNT HOLES AND AT FIRST BEND RADIUS. SEVERAL PIECES MISS
- [SDR 20000508SH031](https://openairdocs.org/sdr/20000508SH031.md): Exhaust Pipe · cracked · Mar 28, 2000 · N139WT · Mooney M20M · Engine Collector/Tailpipe/Nozzle
  > PILOT REPORTED NEW CO2 INDICATOR TURNS BLACK EACH FLIGHT. FLT WITH DIGITAL CO2 INDICATING INSTRUMENT INDICATES 200 RPM. MAINT LOCATED 1.75 INCH CRACK AT BASE OF NR 2 CYL RISER, FLG MATING TO CYL NR 1 - 5. (LYC PN''S 40B19822 AND 40B19825) FOUND WARPED APPR
- [SDR 20000406SH052](https://openairdocs.org/sdr/20000406SH052.md): Bearing · damaged · Feb 2, 2000 · N9149Y · Mooney M20M · Stabilizer Actuator
  > LUBRICANT IN ROLLER BEARING AT FORWARD END OF PITCH TRIM TUBE BECAME GUMMED UP AND HARDENED TO THE POINT THAT NEITHER ELECTRIC OR HAND WHEEL ACTUATION OF PITCH TRIM WAS POSSIBLE. MALFUNTION WAS CORRECTED BY REPLACING BEARING. THERE IS NO PROVISION FOR PERIOD
- [SDR 99ZZZX3755](https://openairdocs.org/sdr/99ZZZX3755.md): Bulkhead · cracked · Sep 14, 1999 · N2168J · Mooney M20M · Propeller Spinner Section
  > UNABLE TO DETERMINE EXACTLY WHAT THE CAUSE FOR CRACKS WAS; AREA POINTED OUT ON PHOTO NR 1 IS WHERE A BOWED AREA BETWEEN MOUNTING SCREWS WAS FOUND. FOUND THIS AT 3 PLACES. ALSO, FOUND PLASTIC FORWARD SPINNER BULKHEAD NEEDED TO BE SHIMMED FORWARD WHEN INSTALLI
- [SDR 99ZZZX3828](https://openairdocs.org/sdr/99ZZZX3828.md): Fuel Cell · leaking · Sep 1, 1999 · N234BL · Mooney M20M · Fuel Storage
  > FUEL LEAK UNDER WING INBOARD LEFT AND RIGHT.
- [SDR 99ZZZX3823](https://openairdocs.org/sdr/99ZZZX3823.md): Fuel Cell · leaking · Sep 1, 1999 · N89FM · Mooney M20M · Fuel Storage
  > FUEL LEAK UNDER FORWARD WING WALK, TWO INBOARD SCREWS.
- [SDR 99ZZZX108](https://openairdocs.org/sdr/99ZZZX108.md): Bellcrank · loose · Aug 22, 1998 · N1085S · Mooney M20M · Elevator Control System
  > BELLCRANK IS PARTING DUE TO RIVETS WORKING LOOSE.
- [SDR 99ZZZX649](https://openairdocs.org/sdr/99ZZZX649.md): Exhaust Pipe · cracked · Jun 14, 1998 · N424AT · Mooney M20M · Engine Collector/Tailpipe/Nozzle
  > EXHAUST PIPE CRACKED AT THE WELD. APPROXIMATELY A 1 INCH CRACK. THIS CRACK HAS BEEN NOTED ON SEVERAL OTHER AIRCRAFT OF THE SAME MODEL IN EXACTLY THE SAME SPOT.
- [SDR 99ZZZX859](https://openairdocs.org/sdr/99ZZZX859.md): Hose · kinked · Jun 1, 1998 · N628JF · Mooney M20M · Reciprocating Engine Front Section
  > AIRCRAFT RPM WOULD SURGE; MANIFOLD PRESSURE IS UNCONTROLLED, CAUSE WAS HOSE BEING KINKED. SUBMITTER STATED THIS HAS BEEN NOTED ON SEVERAL OTHER AIRCRAFT OF THE SAME MODEL.
- [SDR 98ZZZX40](https://openairdocs.org/sdr/98ZZZX40.md): Wire · defective · Dec 10, 1997 · N9164Z · Mooney M20M · DC Generating System
  > PILOT REPORTED INTERMITTENT STARTING, VOLTAGE FLUCTUATION, AND LOW BATTERY CHARGE. INSPECTION FOUND NR 1 AND NR 2 BATTERY GROUND STRAPS AT AIRFRAME ATTACHMENTS TO HAVE HIGH RESISTANCE AT GROUNDING POINT. CLEANED AREAS AND INSTALLED HARDWARE REFERENCING MOONE
- [SDR 97ZZZX4436](https://openairdocs.org/sdr/97ZZZX4436.md): Bulkhead · cracked · Sep 18, 1997 · N1087M · Mooney M20M · Propeller Spinner Section
  > REAR SPINNER BULKHEAD CRACKED ALL THE WAY AROUND AT RADIUS OF BACKPLATE AND ATTACHING HUB. SUSPECT CAUSE IS INSUFFICIENT SHIMMING AT FRONT BULKHEAD ALLOWING NOSE OF SPINNER TO WOBBLE AND STRESS BACKPLATE. SEARCH OF AIRCRAFT RECORDS LISTS TWO PREVIOUS FAILURE
- [SDR 97ZZZX3875](https://openairdocs.org/sdr/97ZZZX3875.md): Magneto · contaminated · Aug 12, 1997 · N40JE · Mooney M20M · Magneto/Distributor
  > DURING ANNUAL INSPECTION, BOTH MAGNETOS WERE REMOVED TO C/W SLICK RECOMMENDED 500-HOUR INTERNAL EXAMINATION. RIGHT MAGNETO CHECKED OK, NEEDED ONLY MINOR INTERNAL CLEANING AND POINTS ADJUSTMENT. LEFT MAG HAD A GOOD AMOUNT OF INTERNAL CONTAMINATION FROM THE PR
- [SDR 97ZZZX3103](https://openairdocs.org/sdr/97ZZZX3103.md): Door Hinge · rivet sheared · Jun 25, 1997 · N72FG · Mooney M20M · Landing Gear Doors
  > THE RIVETS HOLDING THE INNER STBD MAIN LANDING GEAR DOOR HINGE SHEARED CAUSING THE DOOR TO JAM AND PREVENTING FULL GEAR RETRACTION. GEAR EXTENSION WAS NOT AFFECTED. THE RIVETS WERE REPLACED AND THE BENT OPERATING RODS AND BELLCRANK. GEAR RETRACTION TESTS WE
- [SDR 96ZZZX6004](https://openairdocs.org/sdr/96ZZZX6004.md): Distributor Gear · deteriorated · Oct 15, 1996 · N530JP · Mooney M20M · Magneto/Distributor
  > INVESTIGATION FOR DETERIORATED LT MAG FOUND LEFT MAG WAS (PRESSURIZED) FROM SAME 'T' FITTING AS RIGHT MAG BUT HAS MORE HEAT. LEFT MAG HAS B AND D TACHOMETER PICK UP WITH LARGER ORIFICE WHICH ALLOWS ALMOST TWICE THE AIRFLOW ALLOWING MORE HEAT INTO MAG. SUBMIT
- [SDR 96ZZZX2190](https://openairdocs.org/sdr/96ZZZX2190.md): Controller · defective · Mar 25, 1996 · N1086D · Mooney M20M · Exhaust Turbocharger
  > ENGINE SURGES AT FLIGHT LEVELS. SURGES 200 RPM AND 2 INCH MAP. REPLACED DIFFERENTIAL PRESSURE CONTROLLER TO C/W LYC SB WITH PN 48B21935.
- [SDR 95ZZZX6552](https://openairdocs.org/sdr/95ZZZX6552.md): Guide · excess wear · Nov 1, 1995 · N505RD · Mooney M20M · Reciprocating Engine Cylinder Section
  > PILOT EXPERIENCED ROUGH ENGINE ON RUN-UP. PERFORMED COMPRESSION TEST AND FOUND CYLINDER NR 3 HAD ZERO COMPRESSION. UPON REMOVAL OF CYLINDER, FOUND EXHAUST VALVE MISSING APPROX ONE-THIRD OF FACE AREA. FURTHER INSP REVEALED EXCESSIVE WEAR OF GUIDE. OTHER FIV
- [SDR 95ZZZX4381](https://openairdocs.org/sdr/95ZZZX4381.md): Pump · failed · Aug 17, 1995 · N1086D · Mooney M20M · Fuel Boost Pump
  > AIRCRAFT HAS HAD 3 AUXILIARY FUEL PUMPS FAIL IN 1,000 HOURS. TWO HAVE FAILED, 1 HAD INTERMITTENT HIGH PRESSURE.
- [SDR 95ZZZX4380](https://openairdocs.org/sdr/95ZZZX4380.md): Speed Brake · fail to reetract · Aug 17, 1995 · N9151X · Mooney M20M · Spoilers
  > BOTH SPEED BRAKES HAVE BEEN OUT OF AIRCRAFT FOR FAILURE TO RETRACT. LEFT UNIT AT ABOUT 300 HOURS AND RIGHT UNIT AT 401.0 HOURS. HAVE HAD 2 AIRCRAFT IN 30 DAYS WITH THE SAME RETRACT TROUBLE.
- [SDR 95ZZZX4382](https://openairdocs.org/sdr/95ZZZX4382.md): Pump · failed · Aug 7, 1995 · N1085W · Mooney M20M · Fuel Boost Pump
  > AIRCRAFT HAD AUXILIARY PUMP FAIL WITH ONLY 426 HOURS ON IT.
- [SDR 95ZZZX1366](https://openairdocs.org/sdr/95ZZZX1366.md): Gasket · broken · Feb 22, 1995 · N1085W · Mooney M20M · Reciprocating Engine Oil System
  > NEW MOONEY M20M AT 124.6, ENGINE OIL PAN GASKET LEAKING. REMOVED AND REPLACED WITH 06B2132C, REVISED PART NUMBER AND GASKET. THE TURBO MOUNT IS LOCATED ON THE SIDE OF THE OIL PAN. BOTH GASKETS LEAKED AT THE LT REAR SIDE. BOTH LW-13306 GASKETS WERE FOUND BR

## 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 = 'M20M'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/model/mooney-m20m/reports

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