# Service difficulty reports: Lycoming O-320-H2AD

A list on [Lycoming O-320-H2AD](https://openairdocs.org/engine/lycoming-o-320-h2ad.md).

Newest first. General aviation reporting is voluntary.

Page 1 of 7 · 326 reports

- [SDR 2025FA0000627](https://openairdocs.org/sdr/2025FA0000627.md): Control Cable · broken · Sep 2, 2025 · N737ET · Cessna 172N · Trailing Edge Flap Control System
  > WHILE ON APPROACH TO LAND AT KXBP BASE TO FINAL, THE CFII AND HER STUDENT HEARD A POP IN THE AIRFRAME. THEY NOTICED THE LEFT FLAP WAS "FLAPPING" A LITTLE AND DIDN'T SEEM TO BE SECURED IN THE PROPER CONFIGURATION COMPARED TO THE RH SIDE. THE CFII TOOK CONTROL
- [SDR 2025FA0000409](https://openairdocs.org/sdr/2025FA0000409.md): Crankcase · cracked · Jun 18, 2025 · N3080E · Cessna 172N · Reciprocating Engine Power Section
  > CASE CRACKED AT TOP BASE OF #2 CYLINDER, LEAKING OIL
- [SDR 2022FA0000327](https://openairdocs.org/sdr/2022FA0000327.md): None · none · Jul 1, 2022 · Fuselage Structure (General)
  > ENGINE WAS REMOVED FROM THE AIRCRAFT AND BROUGHT TO US BECAUSE IT STARTED RUNNING RUFF. UPON DISASSEMBLY WE FOUND A PUSHROD DRIVEN THROUGH THE ROCKER ARM. WE FOUND THREE HYDRAULIC LIFTERS SEVERELY WORN ON THE SURFACE THAT CONTACTS THE CAMSHAFT. THE SNAP RING T
- [SDR 2021FA0000165](https://openairdocs.org/sdr/2021FA0000165.md): Windscreen · scratched · Jun 8, 2021 · N739BE · Cessna 172N · Flight Compartment Windows
  > VISOR SCRATCHED WINDSCREEN CAUSING CRACK AT ALONG THE SCRATCH AND DISLODGING A PIECE OF THE WINDSCREEN FROM THE AIRCRAFT.
- [SDR IKBR2020100500013](https://openairdocs.org/sdr/IKBR2020100500013.md): Cylinder · cracked · Oct 5, 2020 · N737LG · Cessna 172N · Reciprocating Engine Cylinder Section
  > DURING 50HR INSPECTION FOUND CRACKED CYLINDER FIN AND BLENDED NR 1 CYLINDER COOLING FIN, AS PER LYCOMING O-320 OHM SECTION 6 PARAGRAPH 6-26(2). ENGINE TSMOH 1627.0.
- [SDR IKBR2020100500014](https://openairdocs.org/sdr/IKBR2020100500014.md): Carburetor · leaking · Oct 5, 2020 · N737LG · Cessna 172N · Fuel Control/Reciprocating Engines
  > DURING 50HR INSPECTION FOUND CARB P/N 10-5217 LEAKING. INSTALLED OVERHAULED CARB.
- [SDR 2020FA0000322](https://openairdocs.org/sdr/2020FA0000322.md): Tension Spring · broken · Jul 5, 2020 · N1459E · Cessna 172N · Rudder Control System
  > UNUSUAL RUDDER PEDAL DEFLECTION, AIRPLANE TRIM AND CONTROL FEEL WAS NOTED. MAINTENANCE PERSONNEL DISCOVERED LT RUDDER TENSION SPRING WAS BROKEN AT THE AFT END THAT ATTACHES TO THE RUDDER PEDAL. ALONG WITH THE RT SPRING, THIS SPRING PROVIDES TENSION FOR THE R
- [SDR 2020FA0000040](https://openairdocs.org/sdr/2020FA0000040.md): Rocker · broken · Aug 8, 2019 · N3076E · Cessna 172N · Reciprocating Engine Cylinder Section
  > DURING FLIGHT BOTH PUSHRODS ON THE NR 3 CYLINDER BROKE THROUGH THE ROCKER ARMS CAUSING IMMEDIATE LOSS OF POWER ON THAT CYLINDER AND ENGINE TO RUN ROUGH. AIRCRAFT WAS LANDED SAFELY, PARTS WERE CHARGED AND AIRCRAFT WAS RETURNED TO SERVICE. LIKELY CAUSE IS CRAC
- [SDR CA190717008](https://openairdocs.org/sdr/CA190717008.md): Camshaft · failed · Jul 2, 2019 · Cessna 172N · Reciprocating Engine Power Section
  > (CAN) ENGINE HAS 825 TT SINCE OVERHAUL (OTHER MTCE FACILITY 2018). AT 682 HRS TIS, CAMSHAFT REMOVED BY THE OTHER FACILITY DUE TO FAILURE. MARCH 2019 MAINTENANCE ENTRY INDICATES A NEW CAMSHAFT INSTALLED AT THIS TIME. 142 HRS TIS, ENGINE RECEIVED DUE TO METAL CO
- [SDR CA190717009](https://openairdocs.org/sdr/CA190717009.md): Lifter · failed · Jul 2, 2019 · Cessna 172N · Reciprocating Engine Cylinder Section
  > (CAN) ENGINE HAS 825 TT SINCE OVERHAUL (OTHER MTCE FACILITY 2018). AT 682 HRS TIS, LIFTERS REMOVED BY THE OTHER FACILITY DUE TO FAILURE. MARCH 20019 MAINTENANCE ENTRY INDICATES NEW LIFTERS INSTALLED. 142 TIS, ENGINE RECEIVED DUE TO METAL CONTAMINATION, LIFTERS
- [SDR CA190717006](https://openairdocs.org/sdr/CA190717006.md): Rocker · wrong part · Jul 2, 2019 · Cessna 172N · Reciprocating Engine Cylinder Section
  > (CAN) (*SUP*) DURING ENGINE REPAIR, ROCKER FULCRUMS REMOVED FOR CLEANING AND INSPECTION. ONE FULCRUM NOTICEABLY DIFFERENT THAN OTHER 7. VISUALLY DIFFERENT, DIMENSIONS DIFFERENT, AUTOMOTIVE STYLE PRODUCTION MARKS. LACKS: OEM PART NUMBER, MFG NUMBER, HEAT TREAT
- [SDR CA190717007](https://openairdocs.org/sdr/CA190717007.md): O-Ring · wrong part · Jul 2, 2019 · Cessna 172N · Reciprocating Engine Cylinder Section
  > (CAN) DURING ENGINE REPAIR, CYLINDER SHROUD TUBES REMOVED. SHROUD TUBE O RINGS PREVIOUSLY INSTALLED WERE BLACK IN COLOUR. BOTH OEM AND PMA O RINGS FOR THIS MODEL OF ENGINE ARE ORANGE IN COLOUR. COMPARED TO THE OEM O RING, THE BLACK O RINGS ARE DIMENSIONALLY DI
- [SDR CA190505001](https://openairdocs.org/sdr/CA190505001.md): Tube · punctured · May 4, 2019 · Cessna 172N · Tire Tube
  > (CAN) ON RECENT NUMEROUS OCCASIONS COMPANY AIRCRAFT (CESSNA 152/172 EXPERIENCE A RASH OF TIRE DEFLATION (BOTH MAIN AND NOSE WHEEL) WHILE EITHER UPON LANDING OR TAXIING. INVESTIGATION/INSPECTION OF WHEEL ASSEMBLIES REVEALED SMALL PUNCTURE IN INNER TUBES (GOODYE
- [SDR 2020FA0000034](https://openairdocs.org/sdr/2020FA0000034.md): Magneto · malfunctioned · Oct 1, 2018 · N4844F · Cessna 172N · Magneto/Distributor
  > RIGHT SIDE OF MAG FAILED CHECK. UPON INSPECTION IT WAS FOUND THAT THE LEFT SIDE WAS TIMED TO 22 AND THE RIGHT SIDE WAS TIMED TO 10 BTDC, ALSO THE RIGHT POINTS WERE ONLY OPENING EVERY OTHER CYLINDER CAUSING IT TO ONLY FIRE 2 OF THE 4 CYLINDERS. WHEN I OPENED
- [SDR 2017FA0000607](https://openairdocs.org/sdr/2017FA0000607.md): Collar · loose · Nov 6, 2017 · N734BB · Cessna 172N · Trailing Edge Flap Actuator
  > FLAPS FAILED IN FLIGHT: FOUND FLAP SWITCH'S ACTUATING COLLAR UNSCREWED FROM FLAP ACTUATING TUBE ON JACK SCREW.
- [SDR CA160114007](https://openairdocs.org/sdr/CA160114007.md): Lifter · loose · Jan 9, 2016 · Cessna 172N · Reciprocating Engine Cylinder Section
  > (CAN) UPON TAKEOFF, THE PILOT FELT SIGNIFICANT ENGINE VIBRATION AND REDUCTION OF POWER. AN UNSCHEDULED AND UNEVENTFUL LANDING WAS EXECUTED. ON INSPECTION, MAINTENANCE FOUND THE NR 2 CYLINDER INTAKE HYDRAULIC LIFTER, PN 15B28040/17113IM, HAD LOST THE RETAINING
- [SDR 2015FA0000558](https://openairdocs.org/sdr/2015FA0000558.md): Bolt · broken · Oct 30, 2015 · N999AR · Cessna 172N · Reciprocating Engine Power Section
  > PISTON CONNECTING ROD BOLT BROKE CAUSING PISTON ROD TO PENATRATE ENGINE CRANKCASE CAUSING OIL DEPLETION AND ENGINE FAILURE.
- [SDR CA151008006](https://openairdocs.org/sdr/CA151008006.md): Exhaust Valve · failed · Oct 6, 2015 · Cessna 172N · Reciprocating Engine Cylinder Section
  > (CAN) A FLIGHT INSTRUCTOR AND STUDENT WERE PRACTISING PRECAUTIONARY LANDINGS. AFTER INSPECTING A SUITABLE FIELD, STUDENT PROCEEDED TO OVERSHOOT. AFTER FULL POWER WAS APPLIED, THE ENGINE BEGAN TO RUN ROUGH WITH LOSS OF RPM OBSERVED. THE FLIGHT INSTRUCTOR TO
- [SDR FTUR20150526002](https://openairdocs.org/sdr/FTUR20150526002.md): Rotor · loose · May 26, 2015 · N4818D · Cessna 172N · Magneto/Distributor
  > REMOVED AND DISASSEMBLE MAGNETOS FOR 500 HOUR INSPECTION AND FOUND ELECTRODE ON ROTOR LOOSE AND CAM EXCESSIVELY WORN.
- [SDR CA150526001](https://openairdocs.org/sdr/CA150526001.md): Transponder · smoke · May 22, 2015 · Cessna 172N · ATC Transponder System
  > (CAN) DURING TAXI OF ACFT, SMOKE WAS NOTICED COMING OUT FROM FACE OF TRANSPONDER. ACFT WAS SHUTDOWN & MAIN BASE NOTIFIED. AN INSPECTION WAS CARRIED OUT FROM A LOCAL AMO & DETERMINED TO BE AN INTERNAL PROBLEM WITH THE TRANSPONDER. THE UNIT WAS REMOVED & ACFT
- [SDR CA150417007](https://openairdocs.org/sdr/CA150417007.md): Starter · failed · Apr 15, 2015 · Cessna 172N · Engine Starter
  > (CAN) BETWEEN 2014-06-20 TO 2014-12-16 STARTER WAS CHANGED 5 TIMES, 2 OF THE TIMES IT WAS A LOADER STARTER AFTER THE O/H STARTER DID NOT WORK PROPERLY. THE STARTER USED WAS PN MZ 4222.
- [SDR CA141029011](https://openairdocs.org/sdr/CA141029011.md): Chain · disconnected · Oct 28, 2014 · Cessna 172N · Elevator Tab Control System
  > (CAN) AN ACCEPTANCE INSPECTION OF OUTSIDE CONTRACT WORK, WAS PERFORMED ON THIS AIRCRAFT, AFTER WORK WAS PERFORMED ON THE HORIZONTAL STAB. IT WAS FOUND THAT THE ELEVATOR TRIM CHAIN WAS NOT CONNECTED TO THE SPROCKET AT THE PILOTS TRIM HAND WHEEL. THE TRIM MOVED
- [SDR 2014FA0000533](https://openairdocs.org/sdr/2014FA0000533.md): Stud · backed out · Sep 15, 2014 · Reciprocating Engine Cylinder Section
  > ENGINE NR 1 CYLINDER EXHAUST ROCKER ARM RETAINER STUD BACKED OUT, LOOSENED, THE CYLINDER HEAD CAUSING THE EXHAUST VALVE TO NOT OPEN.
- [SDR CA140910010](https://openairdocs.org/sdr/CA140910010.md): Cylinder Head · damaged · Sep 8, 2014 · Cessna 172N · Reciprocating Engine Cylinder Section
  > (CAN) SEPTEMBER 8, 2014, PILOT REPORTS THAT ENGINE RAN ROUGH IN DOWNWIND OF FIRST CIRCUIT. MAGS FUNCTIONED NORMALLY. NO DIFFERENCE WITH CARB HEAT. ENGINE WAS POPPING ON TAXI BACK IN. ABNORMAL ENGINE NOISE OBSERVED BY MAINTENANCE PERSONEL WHILE AIRCRAFT TAXIED
- [SDR CA140827008](https://openairdocs.org/sdr/CA140827008.md): Lifter · damaged · Aug 14, 2014 · Cessna 172N · Reciprocating Engine Cylinder Section
  > (CAN) A/C WAS FLYING FOR 10 MINUTES WHERE THE ENGINE STARTED TO RUN ROUGH. PILOT CHECKED MAGS AND CARB HEAT (NO CHANGE). PILOT DECIDED TO MAKE PRECAUTIONARY LANDING OUTSIDE OF CITY LIMITS ON PRIVATE ROAD INSTEAD OF FLYING OVER CITY. MAINTENANCE WAS SENT TO HAV
- [SDR CA140312008](https://openairdocs.org/sdr/CA140312008.md): Selector Valve · malfunctioned · Mar 7, 2014 · Cessna 172N · Fuel Selector/Shut-Off Valve
  > ORIGINAL EQUIPMENT SHOWS LARGE DEVIATIONS IN ACCURACY OF THE FUEL VALVE SELECTOR. WHEN INCORRECTLY POSITIONED, EG BETWEEN BOTH AND LT ENGINE WILL OPERATE AT LOWER RPM. FULL POWER APPLICATION SEES A DEGRADATION OF AVAILABLE POWER 20-30 SECS AFTER ADVANCE OF TH
- [SDR 2013FA0000718](https://openairdocs.org/sdr/2013FA0000718.md): Brake Assy · dragging · Oct 9, 2013 · N6303E · Cessna 172N · Landing Gear Brake System
  > BRAKE CALIPER DRAGGING.
- [SDR 2013FA0000510](https://openairdocs.org/sdr/2013FA0000510.md): Lifter · spalled · Sep 10, 2013 · N733LK · Cessna 172N · Reciprocating Engine Power Section
  > INSPECTED FILTER DURING ROUTINE OIL CHANGE, FOUND EXCESSIVE FERROUS METAL. DISCUSSION WITH O/H FACILITY CAUSED US TO REMOVE LIFTERS FOR INSPECTION. FOUND 7 OF 8 LIFTERS WITH DAMAGE. SUBSEQUENT DISASSEMBLY OF THE ENGINE REVEALED THE CAMSHAFT WAS ALSO DAMAGED
- [SDR CA130918014](https://openairdocs.org/sdr/CA130918014.md): Oil System · overpressured · Sep 6, 2013 · Cessna 172N · Reciprocating Engine Oil System
  > (CAN) ENGINE FOUND TO HAVE EXTREME LOW OIL PRESSURE WITH EXTREME HIGH OIL TEMP ON INTIAL POST ENGINE INSTALLATION. ENGINE RUN-UP WITH A NEW REFURBISHED O-320-H2AD.
- [SDR CA130304010](https://openairdocs.org/sdr/CA130304010.md): Seat Belt · malfunctioned · Feb 27, 2013 · Cessna 172N · Emergency Equipment
  > (CAN) ON ROUTINE INSPECTION IT WAS FOUND THAT THE PILOT SIDE SECONDARY SEAT RESTRAINT, PN 505590-403 REEL ASSY OF SERVICE KIT SK210-174B WAS NOT LOCKING WHEN ENGAGED. ADJUSTMENT OF THE CABLE WAS CARRIED OUT IAW ICA AND STILL THE REEL WOULD NOT LOCK INTO PLACE
- [SDR CA130115017](https://openairdocs.org/sdr/CA130115017.md): Cable · broken · Jan 12, 2013 · Cessna 172N · Fuel Control/Reciprocating Engines
  > (CAN) PILOT WAS ON APPROACH WHEN HE PULLED CARB HEAT. THE CONTROL CAME OUT TO A POINT WHERE HE COULD SEE IT WAS NOT ATTACHED AND BROKEN. IT WAS THEN PLACED BACK INTO THE HOLE. IT WAS REPORTED THAT HE DID NOT PULL EXCESSIVELY HARD ON IT AND WAS NOT BINDING BE
- [SDR 2013FA0000024](https://openairdocs.org/sdr/2013FA0000024.md): Seal · leaking · Jan 8, 2013 · N738JX · Cessna 172N · Engine Collector/Tailpipe/Nozzle
  > FRONT CRANKSHAFT OIL SEAL DETERMINED TO BE LEAKING, AND ALLOWING OIL TO DRIP INTO CABIN HEAT EXCHANGER ON MUFFLER, WHICH WAS THE SOURCE OF A SMOKE ODOR. SEAL REPLACED AND ACFT WAS GROUND RUN AND TEST FLOWN WITHOUT DISCREPANCIES.
- [SDR CA121130007](https://openairdocs.org/sdr/CA121130007.md): Exhaust Valve · stuck · Nov 27, 2012 · Cessna 172N · Reciprocating Engine Cylinder Section
  > (CAN) DURING ROUTINE ACFT INSPECTION THE NR 3 CYLINDER HAD A READING OF "0" ON A COMPRESSION LEAK DOWN CHECK. UPON FURTHER INSPECTION THE EXHAUST VALVE WAS STUCK IN THE OPEN POSITION. THE CYLINDER HAD APPROXIMATELY 700 HRS ON IT SINCE IT WAS LAST O/H WO 10-1
- [SDR CA121126016](https://openairdocs.org/sdr/CA121126016.md): Limit Switch · failed · Nov 23, 2012 · Cessna 172N · Trailing Edge Flap Control System
  > (CAN) UPON DAILY INSPECTION BY DISPATCH, FLAPS WOULD NOT EXTEND. NO MOVEMOVEMENT NOTED WHEN SELECTING FLAPS DOWN. ACFT TAKEN OUT OF SERVICE. MAINTENANCE PERSONAL DISCOVERED FAULTY LIMIT SWITCH DURING INSPECTION. REPLACED SWITCH WITH NEW PN S1906-1. FUNCT
- [SDR CA121121006](https://openairdocs.org/sdr/CA121121006.md): Cylinder · damaged · Nov 14, 2012 · Cessna 172N · Reciprocating Engine Cylinder Section
  > (CAN) PILOT REPORTED ROUGH RUNNING ENGINE. RETURNED FOR LANDING. ACFT RUN UP AND INSPECTED ON NOV 19, 2012. ENGINE RAN ROUGH ON RUN UP BY MAINTENANCE PERSONAL. UPON INSPECTION -NR 3 PUSHROD TUBE WAS BENT. NR 3 EXHAUST VALVE STUCK OPEN. CYLINDER REMOVED FOR
- [SDR CA121018003](https://openairdocs.org/sdr/CA121018003.md): Bearing · cracked · Oct 17, 2012 · Cessna 172N · Rudder Control System
  > (CAN) RUDDER PEDALS BEARING HALF FOUND CRACKED, PROABLE CAUSE FROM EXCESSIVE BRAKING OR RUDDER TRAVEL. REPLACED WITH NEW, NO OTHER DAMAGE FOUND UPON INSPECTION.
- [SDR CA121016005](https://openairdocs.org/sdr/CA121016005.md): Flange · broken · Oct 16, 2012 · Cessna 172N · Engine Collector/Tailpipe/Nozzle
  > (CAN) EXHAUST FLANGE BROKEN IN HALF.
- [SDR 2012FA0000430](https://openairdocs.org/sdr/2012FA0000430.md): Points · loose · Jun 22, 2012 · N5089G · Cessna 172 · Magneto/Distributor
  > ENGINE WOULD NOT START. AFTER INSPECTING MAGNETO FOUND MISFIRE ON TEST STAND. OPENED MAGNETO FOR INSPECTION FOUND CONTACT POINT LOOSE WHERE RIVETED TO GROUND. THE POINTS WERE INSTALLED AS PART OF A 500 INSPECTION REPAIR, WITH APROX 25 HRS IN SERVICE.
- [SDR CA120529013](https://openairdocs.org/sdr/CA120529013.md): Discharge Nozzle · damaged · May 6, 2012 · Cessna 172 · Fuel Control/Reciprocating Engines
  > (CAN) STATEMENT AS GIVEN BY CUSTOMER, THE STUDENT AND INSTRUCTOR WERE RECOVERING FROM A POWER ON STALL EXERSIZE. HE COULD NOT REDUCE THE POWER AS THE THROTTLE WAS JAMMED OPEN AT FULL RPM. NEITHER STUDENT NOR INSTRUCTOR COULD REMEDY THE PROBLEM. INSTRUCTOR
- [SDR CA120322003](https://openairdocs.org/sdr/CA120322003.md): Tube · punctured · Mar 21, 2012 · Cessna 172N · Tire Tube
  > (CAN) NOSEWHEEL TIRE WENT FLAT DURING LANDING ROLLOUT. TUBE FOUND TO HAVE.5" CUT. TIRE INSPECTED AND NO OUTSIDE PUNCTURE OR INTERIOR OBJECT OR DEFECTS FOUND TO CAUSE PROBLEM.
- [SDR CA111223006](https://openairdocs.org/sdr/CA111223006.md): Stud · broken · Dec 22, 2011 · Cessna 172N · Reciprocating Engine Cylinder Section
  > (CAN) ENGINE HAD A SUDDEN LOSS OF POWER. ACFT DIVERTED & LANDED SAFELY. UPON INSPECTION THE ENGINE NR 2 CYLINDER INTAKE VALVE RETAINING STUD WAS FOUND BROKEN. CYLINDER INTERIOR INSPECTED W/BOROSCOPE & NO FAULTS FOUND. CYLINDER VALVE DRIVE TRAIN INSPECTED & NO
- [SDR CA111208009](https://openairdocs.org/sdr/CA111208009.md): Skin · damaged · Dec 7, 2011 · Cessna 172N · Trailing Edge Flaps
  > (CAN) ON PREFIGHT WALKAROUND, PILOT DISCOVERED THE RT FLAP TOP CENTER SKIN TO BE TORN WHERE THE CONTROL ROD ATTACHES TO THE FLAP BRACKET.
- [SDR CA111201008](https://openairdocs.org/sdr/CA111201008.md): Tube · split · Dec 1, 2011 · Cessna 172N · Tire Tube
  > (CAN) AS ACFT TAXIED OUT FOR A TRAINING FLIGHT THE RT TIRE WENT FLAT. UPON REMOVAL OF TIRE AND TUBE IT WAS FOUND THAT THE TUBE HAD A.5" LONG SPLIT IN IT. NO FOREIGN OBJECTS FOUND IN TIRE. THIS HAS BEEN AN ONGOING PROBLEM IN THE LAST FEW YEARS AS THE TUBES
- [SDR CA111118017](https://openairdocs.org/sdr/CA111118017.md): Skin · damaged · Nov 17, 2011 · Cessna 172N · Elevator, Plate/Skin
  > (CAN) DURING A PRE-FLIGHT INSPECTION, PILOT NOTICED ELEVATOR BINDING WHEN ELEVATOR FULL NOSE DOWN. CONSIDERABLE FORCE WAS NECESSARY TO FREE THE ELEVATOR. FLIGHT CANCELLED, ACFT SENT FOR INVESTIGATION. AMO REPORTED TWO TEMP RIVETS BINDING ON HS SKIN WHEN ELE
- [SDR CA111117005](https://openairdocs.org/sdr/CA111117005.md): Bulkhead · cracked · Nov 1, 2011 · Cessna 172N · Propeller Spinner Section
  > (CAN) CRACKS FOUND AT PROPELLER BOLT HOLES.
- [SDR CA110920011](https://openairdocs.org/sdr/CA110920011.md): Engine · making metal · Sep 20, 2011 · Cessna 172N · Engine (Reciprocating)
  > (CAN) ON 100HR SCHEDULED INSPECTION, METAL DEBRIS FOUND IN OIL FILTER. ON FURTHER INSPECTION, SCORING FOUND ON CAMSHAFT AND LIFTER "MISSING A CHUNK (OF METAL)". ACFT REMOVED FROM SERVICE, ENGINE REMOVED FROM AIRFRAME AND SENT FOR MAJOR O/H.
- [SDR 2011FA0000428](https://openairdocs.org/sdr/2011FA0000428.md): Pushrod · broken · Jun 30, 2011 · N172N · Cessna 172N · Reciprocating Engine Cylinder Section
  > CYLINDER NR 3 EXHAUST VALVE PUSH ROD BROKE, DUE TO A STUCK VALVE IN THE CLOSED POSITION. THE VALVE WAS NOT STUCK AT THE TIME OF THE INVESTIGATION. NO MARKS WERE SEEN ON THE TOP OF THE PISTON AS VIEWED THROUGH A BORESCOPE. THE SPARK PLUGS HAD ONLY SLIGHT BLA
- [SDR 2011FA0000429](https://openairdocs.org/sdr/2011FA0000429.md): Pushrod · broken · Jun 30, 2011 · N172NT · Cessna 172N · Reciprocating Engine Cylinder Section
  > CYLINDER NR3 EXHAUST VALVE PUSH ROD BROKEN, DUE TO A STUCK VALVE IN THE CLOSED POSITION. THE VALVE WAS NOT STUCK AT THE TIME OF THE INVESTIGATION. NO MARKS WERE SEEN ON THE TOP OF THE PISTON AS VIEWED THROUGH A BORESCOPE. THE SPARK PLUGS HAD ONLY SLIGHT BLA
- [SDR CA110609005](https://openairdocs.org/sdr/CA110609005.md): Tube · split · Jun 9, 2011 · Cessna 172N · Tire Tube
  > ACFT WAS PARKED ON RAMP AFTER FLIGHT AND A COUPLE HOURS LATER A PASSING PILOT NOTICED THE NOSE TIRE COMPLETELY FLAT. MX REMOVED THE TIRE AND DISCOVERED THAT THE TUBE HAD A 1" LONG SPLIT IN IT. THIS HAS BEEN A COMMON OCCURRENCE ON THIS SIZE OF TUBE OVER THE LA
- [SDR CA110531009](https://openairdocs.org/sdr/CA110531009.md): Retainer · failed · May 31, 2011 · Cessna 172N · Wheel/Ski/Float
  > DURING A WALKAROUND THE PILOT NOTICED AN ODD NOSEWHEEL WOBBLE. UPON INSP BY THE AMO, IT WAS DISCOVERED THAT THE INNER BEARING RACE RETAINER ON 1 OF THE WHEEL HALVES HAD CRACKED FREE, ALLOWING THE RACE, BEARING, SEALS AND RINGS TO FALL INTO THE INTERIOR OF THE

Next page: https://openairdocs.org/engine/lycoming-o-320-h2ad/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 = 'O320H2AD'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/engine/lycoming-o-320-h2ad/reports

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