# Service difficulty reports: Continental IO-520-MB

A list on [Continental IO-520-MB](https://openairdocs.org/engine/continental-io-520-mb.md).

Newest first. General aviation reporting is voluntary.

- [SDR 2026FA0000433](https://openairdocs.org/sdr/2026FA0000433.md): Alternator · inoperative · May 27, 2026 · N506DR · Cessna 310R · AC Generator-Alternator
  > THE PILOT REPORTED THE LH ALTERNATOR FAILURE LIGHT ILLUMINATED IN FLIGHT, WITH THE LH ALTERNATOR INDICATING NO ELECTRICAL OUTPUT. THE ALTERNATOR WAS INSTALLED ON 05/20/2025 AT AN AIRFRAME TOTAL TIME OF 4939.8 HOURS AND WAS REMOVED AS INOPERATIVE ON 05/14/2026.
- [SDR 7RKR2024043001](https://openairdocs.org/sdr/7RKR2024043001.md): Muffler · separated · Apr 29, 2024 · N1274G · Cessna 310R · Engine Noise Suppressor
  > DURING VISUAL INSPECTION PRIOR TO MAINTENANCE RH MUFFLER OF LH ENGINE WAS FOUND TO BE COMPLETELY SEPARATED FROM FORWARD PIVOT ADAPTER TUBE AT TUBE-TO-MUFFLER WELD. THE WELD HAD FAILED THE COMPLETE CIRCUMFERENCE OF THE MUFFLER-TUBE JOINT. THERE WAS EVIDENC
- [SDR W1XA20210614](https://openairdocs.org/sdr/W1XA20210614.md): Engine · failed · Jun 14, 2021 · N196TC · Cessna 310R · Engine (Reciprocating)
  > PILOT DEPARTED KANE, WHILE CLIMBING THROUGH 2,700', LEFT ENGINE DEVELOPED A VIBRATION. WHILE SCANNING ENGINE INSTRUMENTS HE NOTICED THE LEFT ENGINE OIL PRESSURE WAS AT ZERO PSI. PILOT TURNED AROUND TO RETURN TO KANE AIRPORT AND BEGAN ENGINE SHUT DOWN PROCEDURE
- [SDR N4CA2019012100002](https://openairdocs.org/sdr/N4CA2019012100002.md): Bellcrank · broken · Jan 17, 2019 · N71NC · Cessna 310R · Landing Gear Retraction/Extension System
  > BELLCRANK FORK ASSEMBLY BROKE WHILE EXTENDING THE LANDING GEAR FOR LANDING CAUSING THE NOSE GEAR TO NOT EXTEND. AIRCRAFT LANDED WITH MAIN GEAR ONLY.
- [SDR 2015FA0000066](https://openairdocs.org/sdr/2015FA0000066.md): Seal · blew out · Feb 19, 2015 · Cessna 310R · Reciprocating Engine Front Section
  > ICE BUILDUP ON VENT TUBE CAUSED CRANKCASE PRESSURES TO INCREASE AND CRANKSHAFT SEAL TO PUSH ON RETAINERS TILL FAILURE. FLIGHT WAS AT NIGHT AND LEAK WAS NOT NOTICED TILL AFTER ACFT LANDED. THE ENGINE LOST 7 QUARTS OF OIL OF ITS 12 QUART OIL CAPACITY.
- [SDR CA120202004](https://openairdocs.org/sdr/CA120202004.md): Support Beam · cracked · Feb 2, 2012 · Cessna 310R · Engine Mount Section
  > (CAN) RIGHT ENGINE SUPPORT BEAMS INSPECTED IAW INSPECTION OPERATION 35 DURING ENGINE REPLACEMENT A2 CM. CRACK WAS FOUND VISUALLY BELOW THE FRONT INBD MOUNT ATTACHMENT BOLT HOLE. ENGINE SUPPORT BEAM REPLACED WITH NEW.
- [SDR CA100809007](https://openairdocs.org/sdr/CA100809007.md): Heater · corroded · May 13, 2010 · Cessna 310R · Fuel Heater
  > PILOTS REPORT SMELL OF RAW FUEL ON DESCENT/APPROACH FROM HEATER. MX CHECKED VARIOUS TIMES BUT COULD NOT DUPLICATE. INSP REVEALED FUEL LINE RUNNING DOWN RT WALL AT CO-PILOT FEET AREA AND VENT SEEPING FUEL OUT OF AREA OF CORROSION ON LINE.
- [SDR 2007FA0000331](https://openairdocs.org/sdr/2007FA0000331.md): Rod Bolt · broken · Apr 4, 2007 · N2641D · Cessna 310R · Engine (Turbine/Turboprop)
  > PRELIMINARY INSPECTION FINDINGS: IN FLIGHT, LT ENGINE FAILURE ON CLIMB OUT. LT ENGINE HAD 737.1 HOURS AND PUT IN SERVICE 05/2003. LARGE HOLE IN CASE AROUND NR 5 AND 6 CYLINDER. NR 5 ROD SEPARATED FROM CRANK AND BROKEN IN TWO PIECES A FEW INCHES FROM PISTON
- [SDR AZN2006F00000](https://openairdocs.org/sdr/AZN2006F00000.md): Pushrod Tube · broken · Jun 15, 2006 · N3286M · Cessna 310R · Nose/Tail Landing Gear
  > WHILE LANDING NOSE GEAR FAILED TO EXTEND PILOT LANDED AIRCRAFT WITH NOSE GEAR UP, BOTH MAINS DOWN AND LOCKED. FOUND NOSE GEAR PUSH PULL TUBE JUST FWD OF THE GEAR BOX TO BE BROKEN BY THE BEARING ATTACH POINT AT THE IDLER BELLCRANK. PROBABLE CAUSE: AGE, HOURS,
- [SDR CA060510009](https://openairdocs.org/sdr/CA060510009.md): Shaft · broken · May 8, 2006 · Engine Starter
  > THREE GEAR TEETH BROKEN OFF AND MISSING. ONE OTHER TOOTH CRACKED.
- [SDR CA051201001](https://openairdocs.org/sdr/CA051201001.md): Idler Assy · cracked · Nov 30, 2005 · Cessna 310R · Main Landing Gear Strut/Axle/Truck
  > DURING ROUTINE INSPECTION OF THE RIGHT MAIN LANDING GEAR, A SMALL CRACK IN PAINT HAS BEEN FOUND ON THE UPPER RADIUS OF THE BELLCRANK GEAR IDLER DOOR ARM. NON DESTRUCTIVE TEST CONFIRMED THE CRACK AND THE PART HAS BEEN REPLACED.
- [SDR CA050404007](https://openairdocs.org/sdr/CA050404007.md): Torque Tube · cracked · Apr 4, 2005 · Cessna 310R · Landing Gear Retraction/Extension System
  > (CAN) FOLLOWING AN INSPECTION, RECOMMENDED BY THE MANUFACTURER, RT MAIN LANDING GEAR EXTENSION/RETRACTION TORQUE TUBE FOUND CRACKED IN TWO PLACES, AT THE FORK BOLT ATTACHMENT AND THE ARM CLOSE TO IT.
- [SDR CA050218011](https://openairdocs.org/sdr/CA050218011.md): Connecting Rod · bent · Feb 12, 2005 · Cessna 310R · Reciprocating Engine Power Section
  > (CAN) AIRPLANE FLYING AT CRUISE POWER, ENGINE FEATHERED ON ITS OWN, ENGINE PARAMETER CHECK, NO OIL PRESSURE. ENGINE SHUTDOWN, RETURN TO AIRPORT. INITIAL CHECK REVEALED METAL CONTAMINATION, ENGINE SENT TO ENGINE REPAIR SHOP, REPORT OF NR 6 CONNECTING ROD BENT,
- [SDR DIN2004F000A](https://openairdocs.org/sdr/DIN2004F000A.md): Gear · damaged · Feb 10, 2004 · N5336C · Cessna 310R · Magneto/Distributor
  > A COMPLETE O/H OF THE ENGINE AND MAGNETOS WAS ACCOMPLISHED BY MFG ON 6/20/2002. THE PLASTIC GEAR (10-357583) DID NOT SEEM TO BIND WITH ANY FOREIGN MATERIALS. THE GEAR SEEMED FADDED TO A YELLOWISH COLOR. IT DOES NOT SEEM LIKE THIS GEAR WAS REPLACED AT O/H (4
- [SDR CA030626008](https://openairdocs.org/sdr/CA030626008.md): Beam · bent · Jun 19, 2003 · Reciprocating Engine Power Section
  > (CAN) THE MAIN BEAM ON THE NR 2 & 6 CONNECTING RODS WERE BENT. NR 5 WAS THE MOST SEVERE. POSSIBLE CAUSE IS HYD LOCKING.
- [SDR CA030605003](https://openairdocs.org/sdr/CA030605003.md): Contactor · arced · May 26, 2003 · Cessna 310R · Engine Starter
  > (CAN) ELECTRICAL SYSTEM FAILED. LT STARTER RELAY STUCK IN ON POSITION DURING START. STARTER ROTATED TILL BATTERY WAS RUN OUT AS IT WAS A HIGH LOAD. SERVICEABLE RELAY WAS INSTALLED, A NEW BATTERY AND OVERHAULED STARTER WERE INSTALLED, WIRING WAS CHECKED. PROBLE
- [SDR BSY2003F00007](https://openairdocs.org/sdr/BSY2003F00007.md): Downlock Switch · broken · Jan 23, 2003 · N5215C · Cessna 310R · Landing Gear Position and Warning
  > HAD NO RIGHT GEAR DOWN AND LOCK INDICATION. FOUND DOWN AND LOCK SWITCH ACTUATOR ARM BROKEN, REMOVED AND REPLACED ARM. OPS CHECKED GOOD.
- [SDR AZN2003F00000](https://openairdocs.org/sdr/AZN2003F00000.md): Rivet · sheared · Dec 6, 2002 · N3286M · Cessna 310R · Fasteners
  > TWO FASTENERS FAILED AT OUTBOARD AFT TRAILING EDGE OF LEFT WING. WHERE THE AFT TIP FUEL TANK AND OUTBOARD AILERON HINGE BRACKET MOUNT. CREATING MOVEMENT OF AFT WING SPAR, CAUSING A CRACK IN THE UPPER SKIN.
- [SDR CA020116001](https://openairdocs.org/sdr/CA020116001.md): Bracket · broken · Nov 30, 2001 · Cessna 310R · Flight Compartment Lighting
  > (CAN) FIRE IN COCKPIT ON DESCENT FROM FLIGHT TO AIRPORT. SMOKE EMITING FROM RT DASH BY PROP DE-ICE GAUGE. SMOKE TURNED TO FLAME AND EXTINGUISHER EXERCISED. EXAMINATION REVEALED POST LIGHT PLASTIC BROKEN AND FELL DOWN TO METER. LINE POST LIGHT SHORTED ON MET
- [SDR CA010703031](https://openairdocs.org/sdr/CA010703031.md): Diode · failed · Jun 23, 2001 · Cessna 310R · AC Generator-Alternator
  > (CAN) ON JUNE 23/01 THE PILOT SNAGGED HIS A/C AS THE LT ALTERNATOR BEING U/S/. UPON INSPECTION THE ALTERNATOR HAD A HOLE ON THE SIDE OF IT. REMOVED THE ALTERNATOR & BEFORE INSTALLING A NEW ONE, INSPECTED INSIDE THE ENGINE FROM WHERE THE ALTERNATOR WS REMOVED.
- [SDR 20010420CW012](https://openairdocs.org/sdr/20010420CW012.md): Housing · cracked · Apr 20, 2001 · N1852E · Cessna 310R · Reciprocating Engine Cylinder Section
  > LT ENGINE NOT PRODUCING POWER, LEAKING OIL OUT LEFT LEFT TOP GRATE. INSPECTED, FOUND CASE CRACKED BELOW NR 1 CYLINDER AROUND PUSH ROD HOUSING ASSEMBLY AND NR 1 CYLINDER BOTH TOP AND BOTTOM FORWARD CYLINDER DOWN NUTS BROKEN OFF. REMOVED AND REPLACED ENGINE.
- [SDR CA001228033](https://openairdocs.org/sdr/CA001228033.md): Torque Tube · cracked · Oct 15, 2000 · Cessna 310R · Landing Gear Retraction/Extension System
  > (CAN) LEFT MAIN GEAR REPORTED TO PILOT AS PART WAY RETRACTED. GEAR PLACED IN DOWN POSITION WITH 3 GREEN OBSERVED. PILOT LANDED SAFELY.MAINTENANCE PERSONNEL FOUND SPIRAL CRACK ON TORQUE TUBE ON LEFT GEAR ASSEMBLY.
- [SDR CA001106017](https://openairdocs.org/sdr/CA001106017.md): Torque Tube · cracked · Oct 15, 2000 · Cessna 310R · Landing Gear Retraction/Extension System
  > (CAN) LANDING GEAR REPORTED TO PILOT AS PART WAY RETRACTED. (LEFT MAIN). GEAR PLACED IN DOWN POSITION, WITH 3 GREEN OBSERVED. PILOT LANDED SAFELY.MAINTENANCE FOUND SPIRAL SHEAR ON TORQUE TUBE ON LEFT GEAR ASSEMBLY.PART REMOVED AND NEW INSTALLED. OLD PART IS AV
- [SDR CA000927003](https://openairdocs.org/sdr/CA000927003.md): Bellcrank · broken · Aug 31, 2000 · Cessna 310R · Landing Gear Door Retract Section
  > (CAN) AFTER LANDING, PILOT NOTICED THAT THE GEAR DOOR ON THE LEFT MAIN WAS HANGING DOWN. AIRCRAFT WAS PLACED ON JACKS AND GEAR DOOR BELLCRANK WAS FOUND TO BE BROKEN. PART WAS REMOVED AND NEW PART INSTALLED. GEAR SWING WAS COMPLETED 5 TIMES AND GEAR DOOR WOR
- [SDR CA000621019](https://openairdocs.org/sdr/CA000621019.md): Pump · failed · Jun 1, 2000 · Cessna 310R · Fuel Boost Pump
  > (CAN) DURING START UP NO FUEL PRESSURE FOR PRIME WITH PUMP ON HIGH OR LOW. MAINTENANCE REPLACED THE BOOST PUMP IN THE TANK, NOTICED THE LABEL MISSING,RETRIEVED THE LABEL, INSTALLED A NEW PUMP TESTED S. RETURNED AIRCRAFT TO SERVICE.
- [SDR 20000620SH003](https://openairdocs.org/sdr/20000620SH003.md): Engine · surges · May 25, 2000 · N5215C · Cessna 310R · Engine Fuel and Control
  > CMH - RIGHT ENGINE ON APPROACH STARTED SURGING BETWEEN 2,200 RPM AND 2,600 RPM. CHECKED ENGINE OUT COMPLETELY, COULD NOT DUPLICATE. OPS CHECKED GOOD. (X)
- [SDR CA000927002](https://openairdocs.org/sdr/CA000927002.md): Torque Tube · broken · Dec 29, 1999 · Cessna 310R · Landing Gear Retraction/Extension System
  > (CAN) PILOT COULD NOT GET A GREEN LIGHT INDICATION ON THE LEFT MAIN GEAR. PILOT MADE A SUCCESSFUL LANDING WITHOUT ANY DAMAGE TO THE AIRCRAFT. AIRCRAFT WAS PUT ON JACKS IN THE HANGAR AND TORQUE TUBE WAS FOUND TO BE BROKEN. NEW TORQUE TUBE WAS INSTALLED AND
- [SDR CA991007071](https://openairdocs.org/sdr/CA991007071.md): Bellcrank · broken · Oct 7, 1999 · Cessna 310R · Landing Gear Retraction/Extension System
  > (CAN) BELLCRANK ATTACH BOLT AND TRUNNION ATTACH LUGS FAILED. BELLCRANK LOWER AFT LUG ALSO FAILED RESULTING IN THE SIDE BRACE NOT LOCKING AND ALLOWING THE RIGHT GEAR TO COLLAPSE ON LANDING. SUBMITTER STATES THAT THE LANDING GEAR WAS INDICATED AS BEING SAFE BY
- [SDR CA961009007](https://openairdocs.org/sdr/CA961009007.md): Bellcrank · broken · Sep 30, 1996 · Cessna 310R · Landing Gear Door Retract Section
  > (CAN) WHEN AIRCRAFT RETURNED FROM TEST FLIGHT THE RIGHT MAIN GEAR DOOR WAS HANGING DOWN. FURTHER INSPECTION REVEALED THAT THE GEAR DOOR BELLCRANK HAD BROKEN 3" TO THE LEFT OF THE GEAR DOOR ROD END ATTACHMENT.
- [SDR 95ZZZX689](https://openairdocs.org/sdr/95ZZZX689.md): Connect Rod · broke · Jan 23, 1995 · N3208M · Cessna 310R · Reciprocating Engine Power Section
  > NR 6 CYLINDER CONNECTING ROD ASSY, PN 646476, BROKE MIDWAY DOWN ROD. AIRCRAFT WAS IN LEVEL FLIGHT AT 3,000 AGL. FIFTEEN MINUTES AFTER TAKEOFF, CAUSE UNKNOWN.

## 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 engine_model_key = 'IO520MB'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/engine/continental-io-520-mb/reports

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