# Service difficulty reports: Lycoming ALF-502 SER. series

A list on [Lycoming ALF-502 SER. series](https://openairdocs.org/engine/lycoming-alf-502-ser-series.md).

Newest first. General aviation reporting is voluntary.

Page 1 of 2 · 66 reports

- [SDR CIEA200800002](https://openairdocs.org/sdr/CIEA200800002.md): Selector Valve · failed · Apr 15, 2008 · N643CR · Cndair CL600* · Landing Gear Selector
  > DURING FINAL APPROACH THE FLIGHT CREW LOWERED THE LANDING GEAR AND THE NOSE GEAR DOORS OPENED BUT THE LANDING GEAR DID NOT EXTEND. THE CREW MANUALLY LOWERED THE NOSE GEAR USING THE EMERGENCY GEAR EXTENSION SYS AND THE SYS WORKED NORMAL. UPON LANDING MAINT IN
- [SDR WAI2008F00000](https://openairdocs.org/sdr/WAI2008F00000.md): Windshield · cracked · Dec 13, 2007 · N900LG · Cndair CL600* · Flight Compartment Windows
  > ON 28 NOV, 2007 AT 2100, ENROUTE AT FL 330, THE CAPTAIN NOTICED A CRACK IN THE EXTERIOR PANEL OF THE LT FWD WINDSHIELD. THE APPROPRIATE CHECKLIST WAS COMPLETED AND A SPEED REDUCTION AND DECENT REQUESTED. WHILE DESCENDING A LOUD (POP) AND SUBSEQUENT WHISTLING
- [SDR 2007F00023](https://openairdocs.org/sdr/2007F00023.md): Fire Loop · shorted · Mar 6, 2007 · N403WY · Cndair CL6001A11 · Fire Detection
  > FLIGHT CREW REPORTED LT ENGINE FIRE DETECTION FAIL LIGHT CAME ON JUST PRIOR TO ROTATION, THEN FIRE WARNING CAME ON AT 1,500 FEET DURING CLIMB. STAYED ON AFTER DISCHARGING BOTH FIRE BOTTLES. RETURNED TO BASE, AFTER LANDING, APPEARED TO BE NO FIRE. FOUND LT ENGI
- [SDR WAI2007F00001](https://openairdocs.org/sdr/WAI2007F00001.md): Fire Loop · shorted · Mar 6, 2007 · N403WY · Cndair CL6001A11 · Fire Detection
  > FLIGHT CREW REPORTED LT ENGINE FIRE DETECTION FAIL LIGHT CAME ON JUST PRIOR TO ROTATION, THEN FIRE LIGHT CAME ON JUST PRIOR TO ROTATION, THEN FIRE WARNING CAME ON AT 1,500 FT DURING CLIMB. STAYED ON AFTER DISCHARGING BOTH FIRE BOTTLES. RETURNED TO BASE AFTER
- [SDR 2006FA0000563](https://openairdocs.org/sdr/2006FA0000563.md): Adg · deployed · Apr 24, 2006 · N777GD · Cndair CL6001A11 · AC Generation System
  > AIR DRIVEN GENERATOR (ADG) UNEXPECTED DEPLOYED ON POST TAKEOFF CLIMB OUT. PRECAUTIONARY LANDING ACCOMPLISHED. ADG MECHANICALLY RETRACTED/ SAFED; AIRCRAFT FERRIED TO MAINTENANCE DEPOT. ALL WORK ACCOMPLISHED IAW MM. (K)
- [SDR AU510001750](https://openairdocs.org/sdr/AU510001750.md): Indicator · damaged · Dec 12, 2005 · Bag BAE146300A · Auxiliary Gear (Tail Skid)
  > (AUS) AIRCRAFT EXPERIENCED A HIGH SINK RATE DURING LANDING. INVESTIGATION FOUND THAT THE MAIN LANDING GEAR AND TAILSKID CONTACTED THE GROUND CAUSING DAMAGE TO THE TAIL STRIKE INDICATOR. (CASA NR 510001750)
- [SDR A6WA200560016](https://openairdocs.org/sdr/A6WA200560016.md): Fuel Control · unserviceable · Jul 14, 2005 · N179US · Bag BAE146200A · Fuel Control/Turbine Engines
  > CLIMBING THRU 9000 FT NR 1 ENGINE STARTED TO WIND DOWN. BOTH N1 AND N2 WERE DROPPING, TGT APPEARED TO BE RISING. SECURED ENGINE, PERFORMED IMMEDIATE ACTION CHECKLIST C/W QRH. MAINTENANCE REMOVED AND REPLACED NR 1 ENGINE. (K)
- [SDR CA050125011](https://openairdocs.org/sdr/CA050125011.md): Door · deformed · Jan 19, 2005 · Cndair CL600* · Electrical/Electronic Compartment Doors
  > (CAN) THIS AIRCRAFT WAS INSPECTED, TESTED AND FOUND TO EXHIBIT UNACCEPTABLE NOSE AVIONICS ACCESS DOOR DEFORMATION IN EXTREME COLD CONDITIONS. THE DEGREE OF DOOR CORNER CURLING EXCEEDS THE MFG LIMIT FOR SKIN WAVINESS FOR RVSM CERTIFICATION. THIS CONDITION WAS
- [SDR A6WA200460019](https://openairdocs.org/sdr/A6WA200460019.md): Skin · scratched · Jun 2, 2004 · N611AW · Bag BAE146300A · Cargo/Baggage Doors
  > AFT CARGO DOOR SCRATCHES BEYOND THE ALLOWABLE SRM LIMITS. MAINTENANCE REQUESTED REPAIR FROM MFG SYSTEMS. MAINTENANCE CUT DAMAGED AREA OUT IAW BAE SRM 52-32-11 FIG 201 PARA 3B PER BAE FAX BARA/AVR/6767/04-DC. HFEC INSPECTION C/O ON CUT OUT REPAIR, NO CRACKS N
- [SDR CA040602008](https://openairdocs.org/sdr/CA040602008.md): Fitting · corroded · Jun 2, 2004 · Cndair CL600* · Nose/Tail Landing Gear Strut/Axle
  > (CAN) 5 YEAR DETAILED INSPECTION REVEALED CORROSION PITTING BEYOND MANUFACTURER'S LIMITS, INTERNAL, BETWEEN NLG SLIDING TUBE (P/N 200811707)AND AXLE FITTING. NEW PART INSTALLED. THE AXLE FITTING WAS PREVIOUSLY REPLACED IN JUNE 1999 DURING THE 10 YEAR RESTORAT
- [SDR A6WA200460017](https://openairdocs.org/sdr/A6WA200460017.md): Flap Track · worn · May 28, 2004 · N611AW · Bac 146300A · Trailing Edge Flaps
  > RT NR 2 FLAP TRACK HAS WEAR BEYOND THE SRM LIMITS. MAINTENANCE REQUESTED REPAIR FROM MFG SYSTEMS REF AVMAX FAX 611-1908003. MAINTENANCE MAPPED AND SUBMITTED TO BE FOR REPAIR CRITERIA. NDT HFEC CARRIED OUT IAW BAE FAX BARA/AVR/6762/04-04-MK. NO CRACKS NOTED.
- [SDR A6WA200460018](https://openairdocs.org/sdr/A6WA200460018.md): Flap Track · worn · May 28, 2004 · N611AW · Bac 146300A · Trailing Edge Flaps
  > LT NR 2 FLAP TRACK HAS WEAR BEYOND THE SRM LIMITS MAINTENANCE REQUESTED REPAIR FROM MFG SYSTEMS REF AVMAX FAX 611-1908004. DAMAGED AREA MAPPED AND SUBMITTED TO BAE FOR REPAIR CRITERIA. NDT HFEC CARRIED OUT IAW BAE FAX BARA/AVR/6761/04-MK, NO CRACKS NOTED. DV
- [SDR A6WA200460016](https://openairdocs.org/sdr/A6WA200460016.md): Floorbeam · cracked · May 26, 2004 · N611AW · Bag BAE146300A · Fuselage Main, Floor Beam
  > CRACK LOCATED IN THE LOWER RADIUS OF FLOORBEAM 33B AT LBL 62.0 INCHES. MAINTENANCE REQUESTED REPAIRS FROM MFG SYSTEMS REF AVMAX FAX 611-1908002. REPAIRED IAW BAE FAX BARA/AVR/6759/04-DC AND BARA/AVR/6752/04-02. PRIMED IAW BAE 146 AMM 20-10-11. (M)
- [SDR A6WA200460015](https://openairdocs.org/sdr/A6WA200460015.md): Flap Track · worn · May 12, 2004 · N607AW · Bag BAE146200A · Trailing Edge Flaps
  > NR 2 FLAP TRACK, WEAR FOUND ON NR 2 LT LOWER ROLLER THAT MEASURES.033 INCHES DEEP. REQUESTED REPAIR FROM BAE SYSTEMS REF AVMAX FAX 607-1907002. MAINTENANCE REMOVED LOWER CARRIAGE NR 2 LEFT. ROLLERS REPLACED IAW CMM 57-50-22. CARRIAGE REINSTALLED IAW AMM 2
- [SDR A6WA200460014](https://openairdocs.org/sdr/A6WA200460014.md): Fuel Control · fluctuates · May 9, 2004 · N611AW · Bag BAE146300A · Fuel Control/Turbine Engines
  > WHILE IN VMC CLIMBING THROUGH 16000 FEET THE NR 3 ENGINE N1 FLUCTUATION FOLLOWED BY FUEL FLOW DROPPING TO ZERO. ENGINE WAS SHUTDOWN, REMAINDER OF FLT MIN N2 OF 8 PERCENT, N1 26, 10 PSI, OIL QUANT 3/4 FULL. MAINTENANCE REMOVED AND REPLACED NR 3 FUEL CONTROL U
- [SDR A6WA200460013](https://openairdocs.org/sdr/A6WA200460013.md): Axle · vibration · Apr 15, 2004 · N608AW · Bac 146200A · Main Landing Gear Strut/Axle/Truck
  > AIRCRAFT EXPERIENCED VIBRATION AFTER LANDING. MAINTENANCE REMOVED AND REPLACED RT MLG AXLE.
- [SDR A6WA200460011](https://openairdocs.org/sdr/A6WA200460011.md): Flap · malfunctioned · Mar 31, 2004 · N181US · Bac 146200A · Trailing Edge Flap Control System
  > ON CLIMB OUT, FLAP INOPERATIVE/ FLAP MWS ILLUMINATED IMMEDIATELY AFTER SELECTING 24-18 DEGREES, COMPLIED WITH QRH, DIVERTED. CHECKED ECU (4) ONLY ILLUMINATED, RESET FLAP SYSTEM IAW MM, SYSTEM RESET AND OPS CHECK NORMAL ON GROUND AT THIS TIME.
- [SDR CA040322006](https://openairdocs.org/sdr/CA040322006.md): Plenum · fractured · Mar 11, 2004 · Cndair CL600* · APU Core Engine
  > (CAN) WHEN APU STARTED IT WOULD NOT ACCELERATE PAST 40 PERCENT. INVESTIGATION FOUND A LARGE BREACH OF PLENUM ASSY. NATURE OF FRACTURES APPEARS TO BE FATIGUE RELATED DUE TO VIBRATION. APU REMOVED AND FURTHER INVESTIGATION REVEALED A COMPLETELY DETACHED PIECE BR
- [SDR A6WA200460004](https://openairdocs.org/sdr/A6WA200460004.md): Controller · malfunctioned · Mar 4, 2004 · N608AW · Bac 146200A · Cabin Pressure Controller
  > PRESSURIZATION WAS ABNORMAL AFTER TAKEOFF, UNABLE TO CONTROL. CORRECTIVE ACTION IN PROGRESS.
- [SDR CA040226003](https://openairdocs.org/sdr/CA040226003.md): Idg · leaking · Feb 24, 2004 · Cndair CL600* · AC Generator-Alternator
  > (CAN) OIL NOTED LEAKING FROM LT ENGINE DRAIN MAST. INTEGRATED DRIVE GENERATOR REMOVED AND ACCESSORY DRIVE GARLOCK SEAL AND IDG SHAFT O-RING REPLACED. LEAK RETURNED AT DRAIN MAST TWO DAYS LATER. IDG WAS REMOVED AND INSPECTED. THE LEAK WAS DETERMINED TO ORIG
- [SDR CA040226004](https://openairdocs.org/sdr/CA040226004.md): Float Valve · corroded · Feb 24, 2004 · Cndair CL600* · Fuel Control/Reciprocating Engines
  > (CAN) DURING GROUND RUN MAINTENANCE NOTED A RUMBLE FROM THE RT ENGINE AT HI IDLE AND BELOW. THE ECOLOGY TANK FLOAT VALVE WAS REMOVED AND THE FLOAT WAS FOUND TO BE CORRODED AND DETERIORATED PREVENTING PROPER VALVE OPERATION. THE VALVE WAS HELD OPEN ALLOWING AI
- [SDR AUS20040065](https://openairdocs.org/sdr/AUS20040065.md): Harness · faulty · Feb 5, 2004 · Bag BAE146300A · Fire Detection
  > (AUS) NR 4 ENGINE FIRE WARNING SYSTEM WIRING HARNESS FAULTY.
- [SDR AUS20030922](https://openairdocs.org/sdr/AUS20030922.md): Hose · ruptured · Sep 10, 2003 · Bag BAE146300A · Landing Gear Retraction/Extension System
  > (AUS) LT MLG RETRACTION JACK FLEXIBLE HYDRAULIC HOSE RUPTURED. LOSS OF GREEN SYSTEM HYD FLUID.
- [SDR AUS20030830](https://openairdocs.org/sdr/AUS20030830.md): Seal · failed · Aug 17, 2003 · Bag BAE146300A · Drag Control System
  > (AUS) LT GROUND SPOILER FLOW VALVE RETURN LINE CONNECTOR O-RING SEAL LEAKING. GRADUAL LOSS OF APPROXIMATELY TEN LITRES OF HYDRAULIC FLUID.
- [SDR A6WA200360025](https://openairdocs.org/sdr/A6WA200360025.md): Warning Light · illuminated · May 1, 2003 · N292UE · Bac 146200A · Aileron Control System
  > MWS RUDDER VALVE LIGHT IS ILLUMINATED IN FLIGHT AFTER DEPARTURE. AIR RETURN TO ORD. RESET ABD, TESTED IAW.
- [SDR A6WA200360022](https://openairdocs.org/sdr/A6WA200360022.md): Structure · dented · Apr 25, 2003 · N290UE · Bac 146200A · Elevator, Tab Structure
  > DENTS OUT OF LIMITS ON THE RT ELEVATOR AND TABS. REPAIR REQUESTED FOR BAE SYSTEM REF AVMAX FAX 1584.
- [SDR AW6A200360021](https://openairdocs.org/sdr/AW6A200360021.md): Panel · dented · Apr 25, 2003 · N290UE · Bac 146200A · Fuselage Main, Plate/Skin
  > DENTS OUT OF LIMITS ON THE LT WING PANEL BETWEEN RIB 14A AND 15. REPAIR REQUESTED FOR BAE SYSTEM REF.
- [SDR A6WA200360023](https://openairdocs.org/sdr/A6WA200360023.md): Skin · dented · Apr 25, 2003 · N290UE · Bac 146200A · Spoilers
  > DENTS OUT OF LIMITS ON THE RT AIR BRAKE. REPAIR REQUESTED FOR BAE SYSTEM REF AVMAX FAX 1584-6900003.
- [SDR AUS20030410](https://openairdocs.org/sdr/AUS20030410.md): Speed Brake · faulty · Apr 9, 2003 · Bag BAE146300A · Drag Control System
  > (AUS) UNCOMMANDED AIRBRAKE OPERATION. EXTENSIVE INVESTIGATION AND TESTING COULD FIND NO CAUSE FOR THE PROBLEM.
- [SDR AUS20030363](https://openairdocs.org/sdr/AUS20030363.md): Pin · damaged · Mar 23, 2003 · Bag BAE146300A · Main Landing Gear Strut/Axle/Truck
  > (AUS) LT MAIN LANDING GEAR DIRECTIONAL LINK UPPER ATTACHMENT PIN FOUND TO BE MIGRATING FROM THE LUG LOCATED AT FRAME 29. LOCKING PLATE AND PIN INCORRECTLY FITTED. MAIN LANDING GEAR IS A NEWLYOVERHAULED UNIT AND HAD ONLY JUST BEEN FITTED TO THE AIRCRAFT 48CYCLE
- [SDR A6WA200360002](https://openairdocs.org/sdr/A6WA200360002.md): Smoke Detector · inoperative · Mar 8, 2003 · N291UE · Bac 146200A · Smoke Detection
  > DURING INSPECTION FORWARD CARGO BAY B LOOP ON NR 1 DETECTOR FAILED (POSITION 1FW). MAINTENANCE REMOVED AND REPLACED NR 1 SMOKE DETECTOR, OPERATIONAL TEST GOOD.
- [SDR AUS20021456](https://openairdocs.org/sdr/AUS20021456.md): Wire · worn · Dec 28, 2002 · Bag BAE146300A · Electrical Power System Wiring
  > (AUS) NR 4 GENERATOR DIFFERENTIAL PROTECTION CIRCUIT WIRE XB108 CHAFED IN AREA ADJACENT TO IDG.
- [SDR A6WA200260078](https://openairdocs.org/sdr/A6WA200260078.md): Bleed Band · out of tolerance · Dec 23, 2002 · N616AW · Bac 146300A · Compressor Bleed Control
  > UPON APPLICATION OF TAKEOFF POWER, NR 2 ENGINE DID NOT RESPOND WHILE TGT WENT TO 950 DEGREES FOR AN ESTIMATED 5 SECONDS BEFORE SECURING. MAINTENANCE FOUND NR 2 ENGINE BLEED BAND OUT OF TOLERANCE. ADJUSTED AS REQUIRED AND PERFORMED 4 POINT RUN. ALL RUNS WITH
- [SDR EXO2003F00000](https://openairdocs.org/sdr/EXO2003F00000.md): Thrust Reverser · damaged · Nov 21, 2002 · N63HJ · Cndair CL6001A11 · Engine Thrust Reverser
  > DURING CLIMB THROUGH FL130 A LOUD BANG FOLLOWED BY RT THRUST REVERSER UNLOCK LIGHT, RETURNED TO AIRPORT. FOUND 12 O'CLOCK BALL SCREW ACTUATOR AFT ATTACH POINT FAILED CAUSING TRANSLATING STRUCTURE TO MOVE DOWN AND AFT ENOUGH TO CAUSE OTHER TWO ATTACH POINTS TO
- [SDR AUS20021338](https://openairdocs.org/sdr/AUS20021338.md): Cable · chafed · Nov 15, 2002 · Bag BAE146300A · Power Lever
  > (AUS) NR 4 THROTTLE LEVER CABLE FOULING ON CENTER ROOF PANEL. PREVIOUS MAINTENANCE HAD BEEN CARRIED OUT FOR BATTERY PACK REPLACEMENT. PERSONNEL/MAINTENANCE ERROR.
- [SDR A6WA200260045](https://openairdocs.org/sdr/A6WA200260045.md): Flap · blocked · Oct 16, 2002 · N608AW · Bac 146200A · Trailing Edge Flap Control System
  > ZERO FLAP LANDING. REF FLAP FAULT WARNING. TOUCHDOWN SPEED, 157. BRAKES APPLIED, 100, BRAKE TEMPS, 470, BRAKE FANS OPERATING, NORMAL BRAKES WERE APPLIED, 70,000 LBS LANDING WEIGHT. MAINTENANCE FOUND LT SIDE BLOCKED, CLEARED BLOCKED CONDITION WITH BUMP BOX
- [SDR A6WA200260044](https://openairdocs.org/sdr/A6WA200260044.md): Floor Support · corroded · Oct 10, 2002 · Bag BAE146300A · Fuselage Miscellaneous Structure
  > CORROSION FOUND ON FLOOR SUPPORT STRUCTURE FRAME 15 - 2.5 INCH PORT OF AIRCRAFT CENTERLINE RIL.
- [SDR A6WA200260041](https://openairdocs.org/sdr/A6WA200260041.md): Structure · dented · Oct 8, 2002 · N612AW · Bac 146300A · Trailing Edge Flaps
  > RIGHT FLAP INBOARD AND OUTBOARD TABS DENTED, RECEIVED CONCESSION.
- [SDR A6WA200260042](https://openairdocs.org/sdr/A6WA200260042.md): Tab · dented · Oct 8, 2002 · N612AW · Bac 146300A · Elevator, Tab Structure
  > DENTS TO LEFT ELEVATOR AND TABS X 8 RECEIVED CONCESSION.
- [SDR A6WA200260043](https://openairdocs.org/sdr/A6WA200260043.md): Tab · dented · Oct 8, 2002 · N612AW · Bac 146300A · Elevator, Tab Structure
  > DENTS TO RT ELEVATOR AND TABS X 34 RECEIVED CONCESSION.
- [SDR A6WA200260035](https://openairdocs.org/sdr/A6WA200260035.md): Tab · dented · Oct 4, 2002 · N612AW · Bac 146300A · Ailerons
  > DENTS LEFT AILERON TABS X 9 RECEIVED CONCESSION.
- [SDR A6WA200260036](https://openairdocs.org/sdr/A6WA200260036.md): Tab · dented · Oct 4, 2002 · N612AW · Bac 146300A · Ailerons
  > DENTS RIGHT AILERON INBOARD AND OUTBOARD TABS X 32 RECEIVED CONCESSION.
- [SDR A6WA200260037](https://openairdocs.org/sdr/A6WA200260037.md): Tab · dented · Oct 4, 2002 · N612AW · Bac 146300A · Leading Edge Devices
  > DENT LEFT FLAP INBOARD TAB X RECEIVED CONCESSION.
- [SDR A6WA200260038](https://openairdocs.org/sdr/A6WA200260038.md): Door · dented · Oct 4, 2002 · N612AW · Bac 146300A · Landing Gear Doors
  > DENTS LEFT MAIN LANDING GEAR DOOR X 18 RECEIVED CONCESSION.
- [SDR A6WA200260039](https://openairdocs.org/sdr/A6WA200260039.md): Door · dented · Oct 4, 2002 · N612AW · Bac 146300A · Landing Gear Doors
  > DENTS RT MAIN LANDING GEAR X 26 RECEIVED CONCESSION.
- [SDR A6WA200260040](https://openairdocs.org/sdr/A6WA200260040.md): Skin · dented · Oct 4, 2002 · N612AW · Bac 146300A · Fuselage Main, Plate/Skin
  > DENTS RIGHT FUSELAGE X 4 RECEIVED CONCESSION.
- [SDR A6WA200260033](https://openairdocs.org/sdr/A6WA200260033.md): Fuel Control · malfunctioned · Jul 17, 2002 · N614AW · Bac 146300A · Fuel Control/Turbine Engines
  > NR 2 ENGINE WENT SUB-IDLE ON APPROACH, HUNG AT 39-40 PERCENT NR 2 AND WOULD NOT ACCELERATE. CREW SHUT DOWN ENGINE. MAINTENANCE REMOVED AND REPLACED FUEL CONTROL.
- [SDR A6WA200260002](https://openairdocs.org/sdr/A6WA200260002.md): Connector · failed · Feb 5, 2002 · N609AW · Bac 146200A · AC Generation System
  > ENROUTE, NR 1 GENERATOR FAILED, NO VOLTS OR HZ, NR 1 AC BUSS AND AC ESSENTIAL BUSS FELL OFF LINE. NR 4 GEN FELL OFF LINE MOMENTARILY WITH AC NR 2 BUSS OFF LINE ALSO. RESET NR 4 GENERATOR BUT ONLY ABLE TO REGAIN AC NR 2 BUSS. STARTED APU, APU GENERATOR SHOW
- [SDR A6WA200100047](https://openairdocs.org/sdr/A6WA200100047.md): Control Box · failed · Aug 10, 2001 · N612AW · Bac 146300A · Turbine Governor
  > NR 1 ENGINE FAILED IN FLIGHT, NO LEAKS NOTED OR DAMAGE NOTED. MAINTENANCE REMOVED AND REPLACED THE HIGH AND LOW PRESSURE FUEL FILTERS, FUEL CONTROL AND PRIMARY OVERSPEED CONTROL BOX.
- [SDR AUS20010766](https://openairdocs.org/sdr/AUS20010766.md): Connector · loose · Jul 19, 2001 · Bag BAE146300A · Engine Indicating System
  > (AUS) NR 4 ENGINE VIBRATION HARNESS PLUG LOOSE.

Next page: https://openairdocs.org/engine/lycoming-alf-502-ser-series/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 engine_model_key = 'ALF502'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/engine/lycoming-alf-502-ser-series/reports

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