Lycoming IO-360-L2A

Service difficulty reports · 994

Newest first. General aviation reporting is voluntary.

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 engine_model_key = 'IO360L2A'
  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 2009FA0000227Guide · chafedDURING 100 HR INSP, FOUND LT AND RT AILERON CABLES WORN THROUGH SEVERAL STRANDS AT WING STA 71. THERE IS A CABLE RUB BLOCK INSTALLED ON THE RIB AT THIS STATION. IT IS CAUSING EXCESSIVE WEAR TO THE CABLES. REPLACED BOTH CABLES IN LT AND RT WINGS. P/N 051010Feb 20, 2009 · N21706 · Cessna 172S · Aileron Control SystemSDR 2009FA0000210Cylinder Head · brokenACFT WAS DOING A STEADY CLIMB AFTER TAKEOFF WHEN HE HEARD A LOUD BANG AND LOST RPM. PILOT LANDED THE PLANE BACK ON THE RUNWAY. FUND THE CYLINDER HEAD ON NR 4 CYLINDER COMPLETELY BLOWN OFF. PROBABLE CAUSE COULD POSSIBLY BE MORE DEFECTIVE CYL ASSY THAN CALLEDFeb 18, 2009 · N5275S · Cessna 172S · Reciprocating Engine Cylinder SectionSDR 2009FA0000089Plug · leakingCRANKSHAFT PLUG IMPROPERLY INSTALLED LEAKING OIL.Feb 17, 2009 · N5335G · Cessna 172R · Reciprocating Engine Oil SystemSDR CA090206001Control Cable · wornFOUND DURING AN INSPECTION THAT THE AILERON BALANCE CONTROL CABLE WAS WORN AT STATION 71.125.Feb 5, 2009 · Cessna 172S · Aileron Control SystemSDR CA090130012Gear · failedDURING POST INSPECTION, ENGINE FAILED TO START. INTERMITTENT ENGAGEMENT OF BENDIX. ONCE REMOVED AXIAL MOVEMENT OF INTERNAL PARTS AS COMPARED TO A NEW STARTER SEEMED EXCESSIVE. STARTER WAS REPLACED AND NOT FURTHER ISSUES WERE NOTED.Jan 18, 2009 · Cessna 172S · Engine StarterSDR 2008FA0000775Servo · defectivePN 383943 PLUG FOUND HANGING BY SAFETY WIRE WHEN TROUBLESHOOTING LACK OF POWER FROM ENGINE. THREADS IN COVER MISSING. THIS SERVO WAS NOT INCLUDED IN AD2008-08-14 DUE TO MFG DATE OF UNIT. THE SERVO WAS ORIGINAL EQUIPMENT ON A 2003, 172S, WITH A TT OF 2462.0 Oct 27, 2008 · N5339M · Cessna 172S · Fuel Control/Reciprocating EnginesSDR CA081007008Switch · inoperative(CAN) TAXI LIGHT SWITCH FAILED WITH 566 HRS OF ACFT OPS FAULT WAS FOUND WHEN TRYING TO CHECK TAXI LIGHT FOR OPS. SWITCH WAS REPLACED 7 MONTHS AGO AND 566 HRS OF OPS.Oct 7, 2008 · Cessna 172S · Exterior LightingSDR CA081010008Magneto · malfunctioned(CAN) POOR MAG DROP, TIMING LIGHT FLICKERING BEFORE 25 DEGREES. MAGNETO REPLACED WITH A SERVICEABLE MAGNETO.Oct 3, 2008 · Cessna 172S · Magneto/DistributorSDR CA081010009Magneto · malfunctioned(CAN) POOR MAG DROP. TIMING LIGHT FLICKERING BEFORE 25 DEGREES. REPLACED WITH SERVICEABLE MAGNETO.Oct 3, 2008 · Cessna 172S · Magneto/DistributorSDR 2008F00024Magneto · damagedEXCESSIVE MAGNETO DROP DURING RUNUP AND MAGNETO CHECK. 100 RPM DIFFERENTIAL BETWEEN LT AND RT MAGNETO, ALSO RT MAGNETO RUNNING ROUGH. CHECKED FOUND RT MAGNETO TIMING OFF. FOUND RT MAGNETO AT 20 DEGREES BEFORE TOP DEAD CENTER, SUPPOSE TO BE 25 DEGREES BTDC. DROct 1, 2008 · N227BH · Cessna 172S · Magneto/DistributorSDR 2008FA0000742Magneto · contaminatedDURING INSPECTION FOR SB 03-08 THE FIRST 5 HOUR INSPECTION FOUND OIL ON THE COIL TAB ON BOTH MAGNETOS AND CAM WEARING ON BOTH MAGNETOS FOR THE AMOUNT HOURS ON MAGNETOS. ALSO, FOUND EXCESSIVE AMOUNT OF OIL INSIDE DISTRIBUTOR FOR THE AMOUNT OF HOURS ON MAGNETOS.Sep 25, 2008 · N452SM · Cessna 172S · Magneto/DistributorSDR CA080926004Resistor · worn(CAN) DURING GROUND RUN, NOTICED THAT THE LOW FUEL WARNING LIGHT FOR THE LT SIDE WOULD FLICK ON. IF YOU WERE QUICK ENOUGH TO CATCH IT THE LT FUEL QUANTITY NEEDLE WOULD TWITCH AT THE SAME TIME. WITH THE SENDER REMOVED THE RESISTANCE IN THE SENDER WAS CHECKED Sep 22, 2008 · Cessna 172R · Fuel Indicating SystemSDR CA080929007Indicator · inoperative(CAN) FUEL QUANTITY SENDER FOUND ELECTRICALLY UNSERVICEABLE, READING EMPTY WHEN TANKS WERE FULL. SERVICEABLE FUEL SENDER INSTALLED.Sep 20, 2008 · Cessna 172S · Fuel Temperature IndicatorSDR CA080903001Starter · malfunctioned(CAN) DURING FIRST START OF THE DAY THE PILOT NOTED A GRINDING NOISE WHEN THE STARTER WAS ENGAGED. THE BENDIX WAS SUSPECTED TO NOT COMPLETELY ENGAGE RING GEAR. STARTER WAS REPLACED AND NO FURTHER ISSUES WERE NOTED.Sep 2, 2008 · Cessna 172R · Engine StarterSDR CA080908002Coil · open(CAN) PILOTS NOTED A DEAD LT MAGNETO WHEN PERFORMING PRE FLIGHT RUNUP. MAGNETO WAS REMOVED AND DISASSEMBLED AND FOUND THAT THE COIL SECONDARY WINDING WAS OPEN CIRCUIT (SHOULD BE BETWEEN 1500-20,000) - MANGETO WAS REPLACED.Aug 27, 2008 · Cessna 172S · Magneto/DistributorSDR CA080919008Starter · failed(CAN) STARTER FAILS TO ENGAGE, SERVICEABLE STARTER INSTALLED.Aug 25, 2008 · Cessna 172R · Engine StarterSDR CA080902001Control Cable · frayed(CAN) DURING IMPORT INSP, THE LT AFT AILERON CABLE WAS CHAFING ON THE PHANOLIC RUB STRIP ATTACHED TO THE RIB EXTENSION AT WS 71.125 RESULTING IN SEVERE DAMAGE TO THE CABLE. CABLE REPLACED. UNFORTUNATELY THE CABLE HAD BEEN REMOVED BEFORE PICTURES WERE TAKEN OF Aug 6, 2008 · Cessna 172S · Aileron Control SystemSDR 2008FA0000529Guide · seizedDURING FLIGHT, THE ENGINE STARTED RUNNING ROUGH AND LOST POWER. EMERGENCY LANDING COMPLETED WITHOUT DAMAGE OR INJURY. MAINT FOUND THE NR 3 EXHAUST VALVE SEIZED IN THE VALVE GUIDE. FURTHER INVESTIGATION FOUND THE GUIDE BROKEN IN THE CYLINDER HEAD. OPERATOR Jul 30, 2008 · N543ER · Cessna 172S · Reciprocating Engine Cylinder SectionSDR CA080708010Transponder · intermittent(CAN) MODE C ALTITUDE REPORTING INTERMITTENTLY REPORTS FALSE ALTITUDES. VISUAL INSP FOUND A CHAFED MODE C A1 CODE WIRE IN THE ALTITUDE ENCODER WIRING. WIRE WAS CHAFFING (DUE TO VIBRATION) ON THE THROTTLE CABLE DIRECTLY BEHIND THE CENTER RADIO PANEL. WIRE WAS RJul 8, 2008 · Cessna 172R · ATC Transponder SystemSDR 2008FA0000403Magneto · out of positionCHECKED THE MAGNETO TIMING AND FOUND THAT BOTH MAGNETOS WERE OFF APPROX 5 DEGREES. CURRENTLY SET AT APPROX 30 DEGREES BEFORE TOP DEAD CENTER. MFG SPEC IS 25 DEGREES BTDC. THE AIRCRAFT ENGINE TO MAGNETO TIMING WAS CHECKED WHEN NEW, SHORTLY AFTER DELIVERY 4/14/Jun 16, 2008 · N987AP · Cessna 172S · Magneto/DistributorSDR 2008FA0000405Magneto · out of positionDURING A PHASE 2 (100 HR) CHECK THE MAGNETO TIMING AND FOUND THE RT MAGNETO ADVANCED TO APPROXIMATELY 27 DEGREES. MFG SPECS CALL FOR 25 DEGREES. LAST CHECK AT 90 HOURS PRIOR, FOUND TO BE OK. SUSPECT MAGNETO DRIFTING IS OCCURING. THE MAGNETOS DRIFTING TO THJun 16, 2008 · N227BH · Cessna 172S · Magneto/DistributorSDR 2008FA0000406Magneto · out of positionDURING THE AC FIRST PHASE 2 INSPECTION (100 HR) FOUND THAT BOTH MAGNETOS WERE OFF APPROXIMATELY 5 DEGREES. CURRENTLY SET 30 DEGREES BEFORE TOP DEAD CENTER PLUS (MFG SUM SAYS 25 DEGREES BTDC) THE AIRCRAFT MAGNETO TO ENGINE TIMING WAS CHECKED WHEN NEW, SHORTLY Jun 11, 2008 · N712DS · Cessna 172S · Magneto/DistributorSDR 2008FA0000407Magneto · out of positionDURING THE AC FIRST PHASE 2 INSP (100 HR) FOUND THAT BOTH MAGNETOS WERE OFF APPROX 5 DEGREES. CURRENTLY SET 30 DEGREES BEFORE TOP DEAD CENTER PLUS MFG SRM SAYS 25 DEGREES BTDC). THE AIRCRAFT MAGNETO TO ENGINE TIMING WAS CHECKED WHEN NEW, SHORTLY AFTER DELIVERJun 11, 2008 · N712DS · Cessna 172S · Magneto/DistributorSDR CA080617002Fitting · broken(CAN) AS THE ACFT WAS TAKING OFF, THE NOSE GEAR COLLAPSED. THE ACFT WAS INSPECTED AND THE NOSE GEAR LOWER FITTING WAS FOUND BROKEN. IT IS UNDETERMINED AT THIS TIME IF THIS WAS A RESULT OF AN UNREPORTED HARD LANDING. RETAINED THE BROKEN PART TO CARRY OUT METALLApr 18, 2008 · Cessna 172R · Fuselage, Landing Gear Attach FittingsSDR ACOR032408001Plug · looseFUEL SERVO REGULATOR HEX PLUG LOOSE ON NON AFFECTED SERVO RSA-5 S/N 70402806. DATA REFERENCED AD 2008-06-51 E, SB 08-73-01, AND PRECISION SB PRS-107. SERVO HAS NOT BEEN NEW, REBUILT, OVERHAULED, OR REPAIRED ON OR SINCE AUGUST 22, 2006.Mar 24, 2008 · N2162Y · Cessna 172S · Fuel Control/Reciprocating EnginesSDR CA080320004Gasket · looseSERVO PLUGS FOUND LOOSE UPON INSPECTION. SERVO PLUG SEALS REPLACED WITH NEW AS PER THE CONVERSATION WITH PRECISION AIRMOTIVE REPRESENTATIVE. ENGINE REMANUFACTURE DATE OF JULY 14, 2004 DOES NOT FALL WITHIN THE DATES SPECIFIED THAT ARE AFFECTED BY THE AIRWORTHMar 14, 2008 · Cessna 172R · Fuselage Miscellaneous StructureSDR CA080320005Gasket · looseAD2008-06-51 FUEL INJECTION SERVO PLUGS, SERVO PLUGS FOUND LOOSE UPON INSPECTION. SERVO PLUG SEALS REPLACED WITH NEW AS PER THE CONVERSATION WITH PRECISION AIRMOTIVE REPRESENTATIVE.ENGINE REMANUFACTURE DATE OF SEPT. 8, 2005 DOES NOT FALL WITHIN THE DATES SPECMar 14, 2008 · Cessna 172S · Fuel Control/Turbine EnginesSDR CA080320006Gasket · looseSERVO PLUGS FOUND LOOSE UPON INSPECTION. SERVO PLUG SEALS REPLACED WITH NEW AS PER THE CONVERSATION WITH PRECISION AIRMOTIVE REPRESENTATIVE. ENGINE REMANUFACTURE DATE OF AUG 18, 2005 AND THE FUEL SERVO WAS REPAIRED JULY 28, 2006 AND BOTH DO NOT FALL WITHIN THMar 14, 2008 · Cessna 172S · Fuel Control/Turbine EnginesSDR 2008FA0000150Wire Harness · deterioratedUPON INSPECTION OF A PHASE II INSPECTION, IT WAS DISCOVERED THAT THE WIRE BUNDLE MOUNT PN S26062 THAT HOLDS THE FLAP MOTOR WIRE HARNESS HAD DETACHED FROM THE RIB IN THE RT WING AND HAD ALLOWED THE WIRE BUNDLE TO CHAF INTO THE INSPECTION PANEL SUPPORT ON THE WIMar 7, 2008 · N467CM · Cessna 172R · Electrical Power System WiringSDR 2008FA0000104Wire Harness · burnedWIRING HARNESS BEHIND AUDIO PANEL WAS CHAFING ON BRACKET THAT HELPS SUPPORT STANDBY BATTERY ON THE PFD SIDE AND CAUSED WIRING TO ARC AND BURN (NOTE: HARNESS IS FOR LIGHT DIMMING OF G-1000). FOUND HARNESS PULLED HARD AGAINST BRACKET. THIS CAUSED THE WIRE TO CHFeb 24, 2008 · N227BH · Cessna 172S · Instrument System WiringSDR 2008FA0000216Nut · looseWHILE PERFORMING SB PRS-107, FOUND PN 383493 HEX NUT PLUG FINGER LOOSE. OTE: HEX NUT WILL BECOME LOOSE IF ENGINE IS WARMED UP. SUSPECT UNDERTORQUED FROM THE FACTORY. (K)Feb 4, 2008 · N227BH · Cessna 172S · Engine (Turbine/Turboprop)SDR 2008FA0000217Servo · undertorquedWHILE PERFORMING SB PRS-107, FOUND PN 383493, HEX NUT PLUG FINGER LOOSE. NOTE: HEX NUT WILL BE LOOSER IF ENGINE IS WARMED UP. SUSPECT UNDERTORQUED FROM FACTORYFeb 4, 2008 · N719JW · Cessna 172S · Fuel Controlling SystemSDR 2008FA0000218Servo · looseWHILE PERFORMING SB PRS-107 FOUND PN 383493 HEX NUT PLUG FINGER LOOSE. NOTE: HEX NUT WILL BE LOOSER IF ENGINE IS WARMED UP. SUSPECT UNDERTORQUED FROM THE FACTORY. (K)Feb 4, 2008 · N452SM · Cessna 172S · Engine Fuel and ControlSDR CA080214011Seat Back · broken(CAN) SEAT BACK FRAME BROKEN JUST ABOVE INSERT ON THE OTBD SIDE. NOTEWORTHY ITEM: THIS SEAT DID HAVE A STEAL BAR INSTALLED IAW AD 2007-05-10. WE DO NOT KNOW WHETHER THIS WAS A CONTRIBUTING CAUSE TO THE FAILURE.Jan 24, 2008 · Cessna 172R · Flight Compartment EquipmentSDR 2007FA0001070Control Unit · failedTHE AIRCRAFT FACTORY INSTALLED ACU BEGAN FAILING AT 200 HOURS (INTERMITTENT ALTERNATOR DROPPING (OFF LINE) FOR A FEW SECONDS) (ON ONE OCCASION, THE FIELD CB DISENGAGED) A NEW ACU WAS INSTALLED AT 215.9. AT 246.1 THE SAME PROBLEM SURFACED, AND THE THIRD ACU WDec 1, 2007 · N2472J · Cessna 172S · AC Generation SystemSDR 2007FA0001112Circuit Breaker · failedCIRCUIT BREAKER WILL RESET AFTER BEING TRIPPED BY ROTATING THE KNOB. THIS RESULTS IN A BREAKER THAT IS RESET WHILE BEING IN THE TRIPPED POSITION. THIS BREAKER WILL PRODUCE THIS RESULT EVERY TIME THAT THIS PROCEDURE IS TRIED. THIS PARTICULAR BREAKER WAS INSTANov 30, 2007 · N18728 · Cessna 172S · Electrical Power SystemSDR CA071212005Hinge Pin · corroded(CAN) DOOR HINGE PINS APPEAR TO BE WELDING RODS OR STEEL PINS CUT LONG AND BENT OVER TO SERVE FROM FALLING OUT. REPLACED WITH PROPER PARTS. CAUSED DISSIMILAR METAL CORROSION TO HINGE MATERIAL AS BOGUS PINS RUSTED. THE ENTIRE FLEET HAS THESE SAME BOGUS PINS (1Nov 27, 2007 · Cessna 172S · Fuselage, Door HingeSDR 2007FA0000999Brushes · wornDURING FLIGHT, PILOT REPORTED LOW VOLTAGE INDICATION. RESET ATTEMPTS WERE UNSUCESSFUL. PILOT RETURNED TO STATION. ALTERNATOR BRUSHES FOUND TO BE WORN BEYOND USE.Nov 8, 2007 · N1180 · Cirrus SR20 · AC Generator-AlternatorSDR ZB0R20070008Detector · inoperativeCARBON MONOXIDE DETECTOR FAILED. SECOND FAILURE WITHIN 6 MONTHSNov 2, 2007 · N60457 · Cessna 172S · Emergency EquipmentSDR CA071102012Bushing · separated(CAN) THE MAIN GEAR LEG BUSHINGS ARE A STEEL OUTER TUBE, WITH A THICK INNER URETHANE CENTER. DURING PROGRESSIVE CARE OPERATION NR 4, INSPECTION OF THE LT MAIN GEAR LEG REVEALED THAT THAT THE URETHANE INNER BUSHING MATERIAL HAD DEPARTED FROM THE OUTER STEEL BUNov 2, 2007 · Cessna 172S · Main Landing Gear Attach SectionSDR 2007FA0000904Bulkhead · misalignedCONTROL CABLE, (P/N 0510105-339), FOUND WORN TO REPLACE LIMITS IAW AC43.13-1A, CABLE INSPECTION. CABLE WAS WORN DUE TO CONSTANT CONTACT WITH LANDING GEAR BULKHEAD FAIRLEAD P/N S338-7. IT IS BELIEVED THAT THE HOLE MISALIGNMENT CAUSED THIS CONSTANT CONTACT. MOct 12, 2007 · N625SP · Cessna 172S · Wing, Rib/BulkheadSDR 2007FA0000898Bulkhead · misalignedCONTROL CABLE, (P/N 0510105-339), FOUND WORN TO REPLACE LIMITS IAW AC43.13-1A, CABLE INSPECTION. CABLE WAS WORN DUE TO CONSTANT CONTACT WITH LANDING GEAR BULKHEAD FAIRLEAD P/N S338-7. IT IS BELIEVED THAT THE HOLE MISALIGNMENT CAUSED THIS CONSTANT CONTACT. COct 12, 2007 · N373ES · Cessna 172R · Wing, Rib/BulkheadSDR 2007FA0000906Bulkhead · misalignedCONTROL CABLE, (P/N 0510105-308), FOUND WORN TO REPLACE LIMITS IAW AC43.13-1A, CABLE INSPECTION. CABLE WAS WORN DUE TO CONSTANT CONTACT WITH LANDING GEAR BULKHEAD FAIRLEAD P/N S338-7. IT IS BELIEVED THAT THE HOLE MISALIGNMENT CAUSED THIS CONSTANT CONTACT. MOct 12, 2007 · N658SP · Cessna 172S · Wing, Rib/BulkheadSDR 2007FA0000907Bulkhead · misalignedCONTROL CABLE, (P/N 0510105-308), FOUND WORN TO REPLACE LIMITS IAW AC43.13-1A, CABLE INSPECTION. CABLE WAS WORN DUE TO CONSTANT CONTACT WITH LANDING GEAR BULKHEAD FAIRLEAD P/N S338-7. IT IS BELIEVED THAT THE HOLE MISALIGNMENT CAUSED THIS CONSTANT CONTACT. MOct 12, 2007 · N2630U · Cessna 172R · Wing, Rib/BulkheadSDR 2007FA0000897Control Cable · wornCONTROL CABLE, (P/N 0510105-308), FOUND WORN TO REPLACE LIMITS PER AC43.13-1A, CABLE INSPECTION. CABLE WAS WORN DUE TO CONSTANT CONTACT WITH LANDING GEAR BULKHEAD FAIRLEAD P/N S338-7. IT IS BELIEVED THAT THE HOLE MISALIGNMENT CAUSED THIS CONSTANT CONTACT. MOct 12, 2007 · N379TA · Cessna 172S · Elevator Control SystemSDR 2007FA0000931Bulkhead · misalignedCONTROL CABLE, ( P/N 0510105-308), FOUND WORN TO REPLACEMENT LIMITS IAW CABLE WEAR INSPECTION GUIDELINES IN AC43.13-1A. THE CABLE CONSTANTLY RUBS THE S338-7 FAIRLEAD IN THE LANDING GEAR BULKHEAD HOLE. IT IS BELIEVED THAT A HOLE MISLOCATION CAUSES THE MISALIGSep 12, 2007 · N658SP · Cessna 172S · Wing, Rib/BulkheadSDR 2007FA0000937Control Cable · wornLT AND RT ELEVATOR CONTROL CABLES, ( P/N 0510105-189), FOUND WORN TO REPLACEMENT LIMITS IAW CABLE WEAR INSPECTION GUIDELINES IN AC43.13-1A. CABLE WAS WORN DUE TO CONSTANT CONTACT WITH THE MICARDA PLATES OVER THE FUEL LINES AT FUEL SELECTOR AREA JUST FORWARD OSep 12, 2007 · N7262Y · Cessna 182S · Elevator Control SystemSDR BJF2007F00000Cylinder · crackedAIRCRAFT EXPERIENCED PARTIAL POWER LOSS. LANDED WITHOUT INCIDENT. INSPECTED ENGINE NOTED HOLE, NR 3 SPARK PLUG WITH A LARGE CRACK EXTENDING DOWN TO EXHAUST PORT FLANGE. FURTHER INSPECTION ALSO FOUND NR 1 CYLINDER CRACKED AT SAME LOCATION BUT HAD NOT YET HADSep 10, 2007 · N269LP · Cessna 172S · Reciprocating Engine Cylinder SectionSDR 2007FA0000719Fuel Control · out of limitsDURING PRE TAKE OFF RUN UP, THE MAG DROP (BOTH MAGS) WAS BEYOND LIMITS. THIS AIRCRAFT HAD A RECENT HISTORY OF RICH SERVO OPERATION FOLLWED BY ADJUSTMENTS, WHICH WOULD NOT STABILIZE. THE SERVO WAS CHANGED. THIS PROBEM IS COMMON ON MANY OF THE AIRCRAFT IN THIS FAug 21, 2007 · N471ER · Cessna 172S · Engine Fuel and ControlSDR 2007FA0000720Control Cable · frayedDURING A ROUTINE INSPECTION, THE AILERON BALANCE CABLE WAS FOUND BADLY WORN IN THE LT WING AT STATION 71.125. THE CABLE IS DIRECTED OVER A FAIRLEAD AT THIS LOCATION AND TYPICALLY WEARS VERY BADLY AT THIS CONTACT POINT. BECAUSE THE WEAR PATTER IS OVER A STRAIGHAug 21, 2007 · N454ER · Cessna 172S · Aileron Control System
Back to Lycoming IO-360-L2A