Cessna 172M

Service difficulty reports · 589

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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 aircraft_model_key = '172M'
  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 2026FA0000593Impulse Coupling · shearedAIRCRAFT REPORTED TO BE HARD TO START OVER MULTIPLE STARTS. DURING 100HR INSPECTION REMOVED LEFT MAGNETO P/N 4371 AND DISASSEMBLED FOR INSPECTION. DURING INSPECTION OF MAGNETO FOUND 1 PAWL PIN SHEARED FROM IMPULSE COUPLING.Jul 8, 2026 · N5367H · Cessna 172M · Magneto/DistributorSDR 2026FA0000386Stiffener · shearedFLAP TRACK STIFFENERS THAT KEEP THE FLAP TRACKS STRAIGHT AND TRUE WERE FOUND TO BE SHEARED OFF AND/OR CRACKED.May 15, 2026 · N61803 · Cessna 172M · Wing Miscellaneous StructureSDR 2026FA0000336Stiffener · shearedFLAP TRACK STIFFENERS THAT KEEP THE FLAP TRACKS STRAIGHT AND TRUE WERE FOUND TO BE SHEARED OFF AND/OR CRACKED.May 7, 2026 · N61803 · Cessna 172M · Trailing Edge FlapsSDR 2026FA0000349Flap Track · bindingDURING STALL TRAINING WITH FLAPS EXTENDED FULL, RECOVERED FROM STALL ATTEMPTED TO RAISE FLAPS AND WOULD NOT RAISE. FOUND RH FLAP TO BE TWISTED AND BENT. RH INBD FLAP TRACK LOWER BRACKETS WERE BROKEN. APPEARS RH INBD FLAP TRACK FAILED CAUSING FLAP TO BIND IN IMay 5, 2026 · N20544 · Cessna 172M · Trailing Edge Flap Control SystemSDR 2026FA0000253Bulkhead · crackedFOUND FORWARD PROPELLER SPINNER BULKHEAD CRACKED AT 3 PROPELLER BOLT HOLES. 428.3 HOURS ON PART. WAS REPLACED PRIOR ON APR 21, 2025. PROPELLER WAS BALANCED ON 1/13/2025. BALANCED TO .07 IPS.Apr 6, 2026 · N9698V · Cessna 172M · Propeller Hub SectionSDR 2026FA0000214Bushing Sleeve · migratedFOUND BRONZE PARTICLES IN FULL FLOW FILTER AT INSPECTION. TRACED TO MIGRATING CONNECTING ROD BUSHINGS ON ALL 4 RODSMar 25, 2026 · N1470 · Cessna 172M · Reciprocating Engine Power SectionSDR 2026FA0000201Impulse Coupling · defectiveMAGNETO PULLED DURING ROUTINE MAINTENANCE TO CHECK FOR THE PRESENCE OF A CHAMPION MANUFACTURED IMPULSE COUPLING. ONE WAS FOUND INSTALLED AND THUS REMOVED FOR REPLACEMENT WITH A NEW ES3163 IMPULSE COUPLING. AFTER REMOVAL OF THE OLD IMPULSE COUPLING, I DISASSEMMar 20, 2026 · N314AV · Cessna 172M · Magneto/DistributorSDR 2026FA0000159Cylinder · crackedPOSITION # 1 &2 CYLINDER EXHAUST PORT CRACK FROM THE INBOARD EXHAUST STUD EXTENDING TO THE BACK OF THE PORT. CRACK VISIBLE THROUGH THE FINS. SUPERIOR CYLINDERS PN: SL32006W-A1 SERIAL NUMBER 326W000003625 & 326W000003623.Mar 5, 2026 · N70052 · Cessna 172M · Reciprocating Engine Cylinder SectionSDR 2025FA0000723Sump · brokenSTATIC CONDENSATION BULB P/N S-1258-1 FOUND SEPARATED FROM AN 1/8 PIPE BY PIPE 90 DEGREE FITTING. THESE CONDENSATION BULBS ARE OF VERY CHEAP PLASTIC AND ARE FAMOUS FOR LEAKING RIGHT OUT OF THE BOX. THERE SEEMS TO BE NO OTHER PART OF BETTER QUALITY. I HAVE SEENOct 17, 2025 · N61789 · Cessna 172M · Fuselage Main, StructureSDR 2025FA0000666Wire Harness · chafedTHE BATTERY BOX FOR THE LEAD ACID BATTERY INTERFERES WITH THE LEFT MAGNETO HARNESS AND CHAFES THE HARNESS LEADS OVER TIME. THE INBOARD , FORWARD CORNER IS THE POINT OF CONTACT. I HAVE SEEN THIS SITUATION IN MANY 172S. ELECTRONIC MAGNETOS LIKE THE SUREFLY HAVE Sep 28, 2025 · N61789 · Cessna 172M · Electrical Power System WiringSDR 2026FA0000181Bulkhead · crackedFOUND SPINNER BULKHEAD CRACKED 273 HRS. REPLACED BULKHEAD WITH NEW P/N: 0550321-4Aug 19, 2025 · N73345 · Cessna 172M · Propeller AssemblySDR 2025FA0000427Flapper Valve · crackedON APPROACH CARBURETOR HEAT WAS APPLIED AND THE ENGINE IMMEDIATELY LOST POWER BUT DID NOT STOP RUNNING. THE PILOT ATTEMPTED TO DE-SELECT THE CARBURETOR HEAT AND THE LOSS OF POWER PERSISTED. THE AIRCRAFT WAS ABOUT 2300 FEET MSL AND 2 NM FROM THE RUNWAY. THE AIRJun 26, 2025 · N4454R · Cessna 172M · Engine Air Intake SystemSDR 2026FA0000180Bulkhead · crackedDURING A FLEET WIDE SAFETY STAND DOWN. REMOVED SPINNER TO INSPECT FRONT PROPELLER BULKHEAD FOR CRACKS. FOUND CRACKS AT BOLT HOLESApr 17, 2025 · N73345 · Cessna 172M · Propeller AssemblySDR 2025FA0000096Throttle Control · looseACFT RETURNED TO BASE DUE TO VIBRATION AT 300FT ON 2/8/25. PILOT REPORTED ENGINE STARTED SHAKING SIGNIFICANTLY. HE PULLED CARB HEAT HOT SAW NO CHANGE. TOLD TOWER HE WAS LANDING. CARB HEAT SYSTEM WAS INSPECTED WITH NO DEFECTS FOUND. CARB WAS REPLACED. CARBFeb 8, 2025 · N73454 · Cessna 172M · Fuel Control/Reciprocating EnginesSDR 2024FA0000599Case Half · wornREMOVED AND REPLACED RH MAGNETO DUE TO 500 HOUR OVERHAUL LIMIT. NEW MAGNETO INSTALLED FOR 78.2 HOURS BEFORE A FLIGHT WAS CANCELLED DUE TO EXCESSIVE VIBRATION AND HIGH MAG DROP ON RH SIDE AT PRE-RUN. ATTEMPTED TO TIME RH MAGNETO TO ENGINE. POINTS APPEARED TO OPAug 13, 2024 · N20565 · Cessna 172M · Magneto/DistributorSDR 2024FA0000258Crankshaft · crackedTOTAL INTERNAL CRANKSHAFT FAILURE AT CHEEK BETWEEN #3 AND #4 CONNECTING ROD JOURNALS CAUSING CRANKCASE TO COMPLETELY SEPARATE IN THE CENTER. CRACK APPEARS TO HAVE STARTED IN THE REAR THRUST RADIUS OF #3 CONNECTING ROD JOURNAL. PILOT HAD REPORTED ENGINE ROUMar 26, 2024 · N70392 · Cessna 172M · Engine (Reciprocating)SDR 2023FA0000751Pushrod · damagedDURING INSPECTION FOR ROUGH RUNNING ENGINE, PERFORMED SB388C (EXHAUST VALVE GUIDE INSPECTION) & FOUND 3EA ROCKER ARMS P/N 17F19357 & 3EA PUSH RODS P/N 15F19957-10 WITH MECHANICAL DAMAGE (HEAVY SCUFF - SCORING). ROCKER ARMS & PUSH RODS TSN: 147.9. PREVIOUSLY RENov 9, 2023 · N9012H · Cessna 172M · Reciprocating Engine Cylinder SectionSDR 2023FA0000613Rocker · damagedLYCOMING FACTORY OVERHAULED O-320-D2J, S/N L-17060-39E. DURING ROUTINE MX, SB388C (EXHAUST VALVE GUIDE INSP.) FOUND 4EA PUSH RODS P/N 15F28835-10, 2EA PUSH RODS P/N 15F28835-09, 6EA ROCKER ARMS P/N17F19357, 6EA SOCKETS P/N 15B21319 & 6EA LIFTERS P/N 15B26066 TOct 19, 2023 · N9643Q · Cessna 172M · Reciprocating Engine Cylinder SectionSDR 2023FA0000602Rocker · damagedLYCOMING FACTORY REBUILT - O-320-D2J, S/N RL-20892-39E. DURING ROUTINE MX. SB388C (EXHAUST VALVE GUIDE INSPECTION) FOUND 3EA HYDRUALIC TAPPETS P/N 15B21319, 3EA HYDRAULIC LIFTERS P/N 15B26066, 3EA ROCKER ARMS P/N 17F19357, 2EA PUSH RODS P/N 15F28835-10 & 1EA POct 18, 2023 · N9936V · Cessna 172M · Engine (Reciprocating)SDR 2023FA0000539Rocker · damagedLYCOMING FACTORY REBUILT O-320-D2J, S/N RL-20764-39E. DURING ROUTINE MX, SB388C (EXHAUST VALVE GUIDE INSPECTION) FOUND 7EA ROCKER ARMS P/N 17F19357, 1 EA PUSH ROD P/N 15F28835-09, 6EA PUSH RODS P/N 15F28835-10, 7EA TAPPET SOCKETS P/N 15B21319 & 7EA PLUNGERS P/Sep 14, 2023 · N9012H · Cessna 172M · Engine (Reciprocating)SDR 2023FA0000467Rocker · damagedLYCOMING FACTORY REBUILT O-320-D2J, TSN / TT: 2089.1. DURING ROUTINE MX, LYCOMING SB388C (EXHAUST VALVE GUIDE INSPECTION) FOUND 6EA VALVE PUSH RODS P/N 15F28835-10, 6EA ROCKERS P/N 17F19357 & 1EA TAPPET SOCKET P/N 15B21319 TO HAVE MECHANICAL DAMAGE (HEAVY SCUAug 25, 2023 · N17HZ · Cessna 172M · Engine (Reciprocating)SDR 2023FA0000358Unknown · unknownBROKEN- CRACKEDJul 7, 2023 · Cessna 172M · Standard Practices/StructuresSDR 2023FA0000311Oil System · leakingTEST, TEST, TEST: N5171H, C172, DECLARED AN EMERGENCY DUE TO SMOKE IN THE COCKPIT AND LANDED WITHOUT INCIDENT. 01/24/2023 1705Z///// MAINTENANCE FOUND THAT OIL CAME OUT OF THE OIL LINE GOING TO THE OIL PRESSURE GAGE AND WENT ONTO THE EXHAUST PIPE CAUSING THE SJun 12, 2023 · N5171H · Cessna 172M · Turbine Engine Oil SystemSDR 2023FA0000620Cylinder · damagedNUMBER 5 CYLINDER EXHAUST VALVE BROKE AT THE VALVE STEAM KEEPER. THE BRAKE WAS A CLEAN BRAKE, PICTURES AVAILABLE ON REQUEST. THE CYLINDER WAS COMPLETELY DESTROYED PISTON BUSTED IN HALF. THE CYLINDER P/N 658319A2BP HAD APPROXIMATELY 35HRS. FROM NEW. CUSTOMER May 10, 2023 · N2671L · Cessna 172M · Reciprocating Engine Cylinder SectionSDR 2023FA0000097Battery Pack · mismanufacturedA NEW ARTEX ELT WITH A NEW BATTERY WAS INSTALLED IN THE AIRCRAFT ON 8/16 AND THE BATTERY PACK LABEL HAD A MANUFACTURE DATE OF 5/16 AND AN EXPIRATION DATE OF 10/23. UPON ROUTINE INSPECTION ON 2/23, THE BATTERY DID NOT HAVE ENOUGH ENERGY TO PASS ITS INTERNAL TESFeb 22, 2023 · N12492 · Cessna 172M · Emergency Locator BeaconSDR 2023FA0000066Crankshaft · corrodedSIGNIFICANT CORROSION WAS FOUND ON THE INTERIOR OF THE CRANKSHAFT NEAR THE PROPELLER FLANGE, JUST BEHIND THE SHAFT PLUG. THIS AREA IS REGULARLY INSPECTED IF THE ENGINE IS RATED FOR 160HP PER AD 98-02-08. SINCE THIS AIRCRAFT IS ONLY RATED FOR 150HP IT IS NOT REFeb 6, 2023 · N20093 · Cessna 172M · Engine (Reciprocating)SDR 2023FA0000086Oil System · leakingN5171H, C172, DECLARED AN EMERGENCY DUE TO SMOKE IN THE COCKPIT AND LANDED WITHOUT INCIDENT. 01/24/2023 1705Z///// MAINTENANCE FOUND THAT OIL CAME OUT OF THE OIL LINE GOING TO THE OIL PRESSURE GAGE AND WENT ONTO THE EXHAUST PIPE CAUSING THE SMOKE.Jan 24, 2023 · N5171H · Cessna 172M · Turbine Engine Oil SystemSDR 2022FA0000272Cowl Fastener · brokenI DO NOT KNOW IF I OR THE MANUFACTURER NEED TO REPORT THIS. I BOUGHT A FEW COWLING FASTENERS AND THEY ALL FAILED WITHIN 30 HOURS OF INSTALLATION. FEB 2022 I BOUGHT 4 SKYBOLT SK2003-42A COWLING MOUNT FASTENERS FROM THE MANUFACTURER. 3 WERE INSTALLED ON THEMay 22, 2022 · N3JA · Cessna 172M · FastenersSDR 2020FA0000318Cylinder · separatedINSPECTION OF THE ENGINE FOUND FORWARD RIGHT CYLINDER SPLIT MIDWAY IN TWO SECTIONS EXPOSING PISTON AND COMBUSTION CHAMBER LEAVING 1 /1/2 INCH. ROCKER ARM TUBES ALSO SEPARATED FROM ENGINE BLOCK. CYLINDER ASSEMBLY PN: SL32006W-A20P WAS INSTALLED NEW ON LAST OVJun 30, 2020 · N555CV · Cessna 172M · Reciprocating Engine Cylinder SectionSDR 3WF2020F00000Drive Assy · crackedDURING FLIGHT THE LEFT FLAP WAS RETRACTED AFTER A LANDING AND TAKEOFF. UP WIND THE STUDENT ADVISED HIS INSTRUCTOR THAT HE WAS HAVING CONTROL ISSUES. THE INSTRUCTOR QUICKLY ASCERTAINED THAT HE HAD ASYMMETRICAL FLAP DEPLOYMENT. HE LOWERED THE FLAPS AGAIN AND Nov 2, 2019 · N9904V · Cessna 172M · Trailing Edge Flap ActuatorSDR CA190808002Impulse Coupling · failed(CAN) DURING PRE-TAKEOFF GROUND RUN THE PILOT REPORTED A "DEAD RH MAG". MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THE IMPULSE COUPLING ON THE RH MAGNETO HAD BROKEN WHICH CAUSED A SHIFT IN MAGNETO-TO-ENGINE TIMING CAUSING THE ENGINE TO NOT RUN ON THE RH MAGNJul 31, 2019 · Cessna 172M · Magneto/DistributorSDR CA190731031Lock Nut · undertorqued(CAN) CREAKING NOISE REPORTED FROM TAIL OF AIRCRAFT. MAINTENANCE NOTED THAT THE TORQUE ON THE NAS679 LOCK NUTS AS USED BY CESSNA ON THE HORIZONTAL STABILIZER WERE LOOSE. THE NAS679A3 NUTS WERE PART OF A RECALL FROM CESSNA SE69-28, BUT ONLY IN THE -3 SIZE. THE Jul 31, 2019 · Cessna 172M · Horizontal Stabilizer StructureSDR CA190731029Circuit Breaker · failed(CAN) THE AVIONICS WERE REPORTED TO BE UNSERVICEABLE. THE AVIONICS MASTER CIRCUIT BREAKER SWITCH WAS FOUND TO BE IN A `NEUTRAL` POSITION AND WHEN POSITIONED TO THE ON POSITION THE AVIONICS WORKED. IT WAS DETERMINED THAT DURING ENGINE OPERATION THE VIBRATION WAJul 22, 2019 · Cessna 172M · Electrical Power SystemSDR 2019FA0000221Tube · failedINSTALLED 600 X 6 MAIN GEAR TUBES IN JAN 2019 AND AT THE FIRST 100 HOUR I ROTATED TIRES AND UPON ROTATING THE TUBES AND AIRING UP TIRES BOTH TUBES FAILED AT THE PARTING SEAM IN THE MIDDLE OF THE TIRE ALMOST LIKE THERE WASN'T A GOOD BOND BETWEEN THE TUBE HALVEJul 11, 2019 · N1674V · Cessna 172M · Tire TubeSDR 2019FA0000193Bolt · brokenRIGHT HAND MAIN LANDING GEAR BOLT, PN S3461-108, WAS FOUND BROKEN DURING ANNUAL INSPECTION. DUE TO THE BOLT BEING BROKEN, THE LANDING GEAR WAS ABLE TO MOVE IN THE RIGHT HAND INBOARD SUPPORT, PN 0541195-6, CAUSING IT TO WEAR. WE REPLACED THE SUPPORT ON THE RIGHJun 25, 2019 · N1666V · Cessna 172M · Main Landing Gear Attach SectionSDR CA190618012Structure · failed(CAN) C XXXX FLAP RETRACTION INCIDENT REPORT 14 JUNE 2019 OCCURRENCE DATE: 12 JUNE 2019 CALLED TO EXAMINE AIRCRAFT AS PARKED ON TAXIWAY IN FRONT OF HANGAR FOLLOWING AN INCIDENT WHERE THE FLAPS FAILED TO RETRACT IN THE GO-AROUND DURING CIRCUITS. FOUND RIGHT HANJun 13, 2019 · Cessna 172M · Trailing Edge FlapsSDR CA190325013Magneto · malfunctioned(CAN) WHILE PERFORMING PRE-FLIGHT ENGINE RUN UP, WHEN RIGHT MAGNETO WAS SELECTED, THE ENGINE BEGAN TO RUN VERY ROUGH ALMOST TO THE POINT OF STOPPING. THE AIRCRAFT RETURNED TO THE HANGAR AND THE FLIGHT WAS CANCELLED.Mar 21, 2019 · Cessna 172M · Magneto/DistributorSDR CA190325012Magneto · malfunctioned(CAN) WHILE PERFORMING PRE-FLIGHT ENGINE RUN UP, WHEN RIGHT MAGNETO WAS SELECTED, THE ENGINE BEGAN TO RUN VERY ROUGH ALMOST TO THE POINT OF STOPPING. THE AIRCRAFT RETURNED TO THE HANGAR AND THE FLIGHT WAS CANCELLED. DECIDED TO REMOVE BOTH MAGNETOS AND INSTALL Mar 21, 2019 · Cessna 172M · Magneto/DistributorSDR 2020FA0000066Cylinder Head · crackedAPPROXIMATELY 2 INCH RADIAL CRACK IN CYLINDER HEAD ADJACENT TO AND OUTSIDE OF THE INTAKE VALVE. EXTERNAL EVIDENCE OF EXHAUST GASSES ESCAPING FROM CRACK WAS PRESENT AND COMPRESSION TEST PRODUCED FREE FLOW OF SHOP AIR FROM CYLINDER HEAD BETWEEN THE 9TH AND 10THDec 11, 2018 · N63SA · Cessna 172M · Reciprocating Engine Cylinder SectionSDR 2020FA0000072Cylinder Head · crackedAPPROXIMATE 1.5 INCH RADIAL CRACK IN CYLINDER HEAD ADJACENT TO AND OUTSIDE OF THE INTAKE VALVE. EXTERNAL EVIDENCE OF EXHAUST GASSES ESCAPING FROM CRACK WAS PRESENT AND COMPRESSION TEST PRODUCED FREE FLOW OF SHOP AIR FROM CYLINDER HEAD BETWEEN THE 9TH AND 10THNov 13, 2018 · N63SA · Cessna 172M · Reciprocating Engine Cylinder SectionSDR CA180925011Impulse Coupling · loose(CAN) DURING FIRST 500 HOUR INSPECTION ON THE MAGNETO THE RIVETS ON THE IMPULSE COUPLING WERE FOUND TO BE LOOSE. THE MANUFACTURER WAS CONTACTED AND THE IMPULSE COUPLING WAS REPLACED. (TC# 20180925011)Sep 21, 2018 · Cessna 172M · Magneto/DistributorSDR 2020FA0000071Cylinder Head · crackedAPPROXIMATELY 2 INCH RADIAL CRACK IN CYLINDER HEAD ADJACENT TO AND OUTSIDE OF THE INTAKE VALVE. EXTERNAL EVIDENCE OF EXHAUST GASSES ESCAPING FROM CRACK WAS PRESENT AND COMPRESSION TEST PRODUCED FREE FLOW OF SHOP AIR FROM CYLINDER HEAD BETWEEN THE 9TH AND 10THMar 9, 2018 · N63SA · Cessna 172M · Reciprocating Engine Cylinder SectionSDR 2018FA0000001Engine · power lossMOMENTARY 200 RPM DROP DURING CRUISE. MADE PRECAUTIONARY LANDING, PERFORMED ENGINE RUN UPS AND COULD NOT DUPLICATE THE MALFUNCTION.Jan 3, 2018 · N73435 · Cessna 172M · Engine (Reciprocating)SDR 2017FA0000491Connecting Rod · misinstalledDURING INSPECTION OF CONNECTING RODS FOR AD2017-16-11, MSB 632B, AN CONNECTING ROD BOLT WAS FOUND WITH INSUFFICIENT THREADS TO HOLD THE CONNECTING ROD TOGETHER.Sep 14, 2017 · N3TN · Cessna 172M · Reciprocating Engine Power SectionSDR 2017FA0000347G Switch · no testELT FAILED TEST OF THE INTERNAL G-WITCH. ELT WOULD NOT SWITCH FROM STANDBY TO ACTIVATE DURING TEST. OPERATIONAL CHECK OF ELT IN ON POSITION GOOD.Aug 4, 2017 · N1955V · Cessna 172M · Emergency Locator BeaconSDR 2017FA0000284Seat · failedDURING THE PILOT'S GROUND PREFLIGHT, THE PILOT SEAT (ADJUSTABLE HEIGHT AND BACK SUPPORT ANGLE) WAS ADJUSTED FOR CONFIGURATION. THE BACK SUPPORT PORTION OF PILOT SEAT FELL BACK ONTO THE REAR SEAT. THE JACK SCREW THAT ADJUSTS THE POSITION OF THE SEAT BACK ANGLE Jul 8, 2017 · N9121H · Cessna 172M · Flight Compartment EquipmentSDR 2017FA0000026Processor · burned outPILOT EXPERIENCED AN ELECTRICAL BURNING ODOR DURING FLIGHT. THE ODOR ORIENTED IN THE VICINITY OF THE CAMERA SYSTEM'S COMPUTER. PILOT DISENGAGED THE CIRCUIT BREAKER AND OBSERVED AN IMMEDIATE DISSIPATION OF THE ELECTRICAL ODOR. PILOT PERFORMED A NORMAL LANDIDec 28, 2016 · N903NS · Cessna 172M · Cabin Equipment/FurnishingsSDR 2016FA0000361Throttle Arm · looseAFTER ABOUT 15 MINUTES OF CONDUCTING A CURRENCY FLIGHT, THE PILOT WAS TURNING BASE LEG FOR RUNWAY 10, THE PILOT TRIED TO REDUCE THE POWER AND DISCOVERED THAT THE THROTTLE WAS NOT RESPONDING, IT WAS STILL PRODUCING FULL POWER. A GO AROUND WAS INITIATED, WE REMJul 28, 2016 · N1256U · Cessna 172M · Fuel Control/Reciprocating EnginesSDR 2016FA0000329Butterfly Valve · tornPILOT REPORTED LOSS OF RPM DURING TAKEOFF, DURING TROUBLESHOOTING IT WAS DISCOVERED RPM WOULD RETURN WHEN THE MIXTURE CONTROL WAS LEANED, INDICATING A RICH MIXTURE CONDITION. DURING A VISUAL INSPECTION OF THE INDUCTION SYSTEM (I.E. AIRBOX AND CARBURETOR) A PIEJul 13, 2016 · N20357 · Cessna 172M · Engine Air Intake SystemSDR 2016FA0000370Rotor · crackedAIRCRAFT CAME INTO SHOP FOR ANNUAL INSPECTION AND PILOT MENTIONED THAT ON LAST FLIGHT HE HAD AROUND A 300 RPM DROP ON RT MAGNETO. PILOT LEANED MIXTURE AND PERFORMED ANOTHER CHECK DURING THE ANNUAL INSPECTION THE TIMING VARIED FROM 25 TO 0 DEGREES BEFORE TOP DJun 9, 2016 · N13295 · Cessna 172M · Magneto/Distributor
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