Cessna 421C

Service difficulty reports · 427

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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 = '421C'
  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 20010501CW001Fuel Cap · crackedFUEL LEAK AT HEATER FUEL FILTER ASSEMBLY IN RIGHT WING. CAP ON TOP OF ASSEMBLY WAS FOUND TO HAVE CRACK IN THREADS. CAP IS MADE OF ALUMINUM. PART IS PRESUMED TO BE ORIGINAL EQUIPMENT. NO KNOW DISASSEMBLY IN SERVICE HISTORY. CAP WAS LOOSE IN SPITE OF LOCK TFeb 7, 2001 · N12RJ · Cessna 421C · Heating SystemSDR 2002FA0000560Combust Chamber · crackedOWNER REQUESTED PRESSURE DECAY TEST IAW AD. PRESSURE COULD NOT BE MAINTAINED. REMOVED HEATER, DISCOVERED LARGE CRACK AT AFT, LOWER WALL OF COMBUSTION CHAMBER, ALONG WELD LINE. THIS HEATER WAS INSTALLED 11/1/99 WITH ONLY 531.3 TT HEATER HOURS ON PART. FJan 17, 2001 · N6798V · Cessna 421C · Heating SystemSDR 20010222CW011Actuator · damagedDURING FLIGHT, OIL AND SMOKE REPORTED BY PILOT FROM LT ENGINE. ENGINE WAS SHUT DOWN AND AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. INSPECTION REVEALED OIL LEAKAGE FROM WASTEGATE ACTUATOR. OIL INLET FITTING LOOSE IN ACTUATOR DUE TO STRIPPED THREADS IN ACTUATODec 14, 2000 · N9RZ · Cessna 421C · Exhaust TurbochargerSDR AU001155Pipe · corroded(AUS) OXYGEN PIPE CORRODED AND LEAKING IN AREA BEHIND PILOTS SEAT SIDELINING. PIPE CONTAINED PIN HOLE CORROSION IN THE AREAS TOUCHING THE SCAT HOSE.Dec 11, 2000 · Cessna 421C · Crew Oxygen SystemSDR AU001139Hose · failed(AUS) LT ENGINE DRIVEN HYDRAULIC PUMP PRESSURE HOSE FAILED. SUSPECT HOSE WAS HEAT STRESSED.Nov 29, 2000 · Cessna 421C · Hydraulic System, MainSDR 20001206SH032Line · looseTHE LEFT ENGINE TURBOCHARGER COMPRESSOR DISCHARGE REFERENCE LINE CAME OFF AT CRUISE POWER AT 15,500 FEET CAUSING THE ENGINE TO DIE WITH AN EXCESSIVELY RICH MIXTURE. THE PILOT DID NOT ATTEMPT LEANING DURING TROUBLESHOOTING AND FEATHERED THE ENGINE, LANDED SAFENov 20, 2000 · N4119M · Cessna 421C · Exhaust TurbochargerSDR 20001206SH031Connecting Rod · failedAIRCRAFT WAS CLIMBING AFTER TAKEOFF, LOUD NOISE HEARD BY PILOT, OIL PRESSURE STARTED TO DROP, ENGINE FEATHERED. AIRCRAFT LANDED WITHOUT INCIDENT. FOUND NR 5 CYLINDER CONNECTING ROD FAILED, KNOCKED HOLE IN UPPER CRANKCASE. ENGINE TOTAL TIME 2,768.7 HOURS, 1Nov 16, 2000 · N410AJ · Cessna 421C · Reciprocating Engine Power SectionSDR 20001206SH022Crankshaft · brokenCRANKSHAFT BROKEN AFT ON NR 2 ROD JOURNAL AT NR 2 MAIN BEARING. ENGINE HAD 401.0 HOURS SINCE RE-MANUFACTURE. (X)Nov 14, 2000 · N11NP · Cessna 421C · Reciprocating Engine Power SectionSDR 20001109SH006Line · leakingRIGHT BRAKE INOPERATIVE. BRAKES WERE SERVICED AND BLED, THEN MECHANIC FOUND HYDRAULIC FLUID LEAKING FROM BOTTOM OF AIRCRAFT. ON FURTHER INSPECTION, LINE PN 5100106-159 WAS FOUND TO HAVE PIN HOLES IN IT. SUBMITTER RECOMMENDED: INSPECT THIS LINE IN MORE DETANov 1, 2000 · N748CA · Cessna 421C · Landing Gear Brake SystemSDR CA001106008Crankcase · cracked(CAN) ON A LEG BETWEEN WPG TO YTH, THE PILOT SNAGGED AN OIL TANK ON RT ENGINE. UPON INVESTIGATION MAINTENANCE FOUND RT ENGINE S/N 239841R RT CASE HALF CRACKED UNDER MAG. MAINTENANCE REMOVED ENGINE AND REPLACED WITH 0 SMOH UNIT S/N 810549R AND RETURNED THE AIOct 20, 2000 · Cessna 421C · Reciprocating Engine Power SectionSDR 20001012SH009Horn · malfunctionedLANDING GEAR WARNING HORN SOUNDED WITH GEAR EXTENDED WHEN FLAPS WERE MOVED FROM 15 DEGREES TO 30 DEGREES. AFTER CYCLING GEAR AND FLAPS 2-3 TIMES, SYSTEM FUNCTIONED PROPERLY. AIRCRAFT LANDED WITHOUT INCIDENT. FLAP SWITCH, THROTTLE SWITCH, AND WIRING WERE INSSep 25, 2000 · N6793V · Cessna 421C · Leading Edge Slat Position Indicating SystemSDR 20001016SH022Line · crackedWHILE CHANGING DEFECTIVE FUEL TANK SELECTOR VALVE (LEFT), FOUND MAIN FUEL LINE TO BOOST PUMP HAD A CRACKED COLLET. NEW LINE INSTALLED. SUBMITTER STATED LEAK OR FAILURE OF THIS LINE COULD CAUSE ENGINE FAILURE AND/OR FIRE. CAUSE OF FAILURE UNKNOWN. (X)Sep 11, 2000 · N3237U · Cessna 421C · Aircraft Fuel Distribution SystemSDR 20001016SH021Skin · damagedDURING AIRCRAFT INSPECTION, FOUND RT STC''ED BAGGAGE LOCKER 28 GAL - FUEL TANK HOLD-DOWNS PULLING THROUGH UPPER WING SKIN. 337 FORMS FOUND, BUT NO STC CERTIFICATE. FURTHER INSPECTION REVEALED THIS ENTIRE INSTALLATION DOES NOT SEEM TO MEET INDUSTRY STANDARDS.Sep 11, 2000 · N3237U · Cessna 421C · Wing, Plate/SkinSDR 20001016SH020Uplock · wornOPERATOR COMPLAINED OF HYDRAULIC SYSTEM STAYING ON AFTER LANDING GEAR RETRACTION. COULD NOT DUPLICATE ON JACKS. CESSNA FIELD SERVICE SUGGESTED INSTALLING NEW IMPROVED PARTS FOR UPLOCK HOOKS AND SWITCHES PER CESSNA SI LETTER NR M81-2. NEW PARTS WERE MORE SUBSep 11, 2000 · N3237U · Cessna 421C · Landing Gear Retraction/Extension SystemSDR 20001016SH019Seat · misinstalledUPON C/W CESSNA MANDATORY SB MEB 00-3, FOUND ALL 4 CABIN SEATS INSTALLED IN WRONG POSITIONS. PLACARDED AND REINSTALLED SEATS FOR SB. SUBMITTER SUGGESTED A RECURRING AD NOTE BE ISSUED TO REQUIRE C/W THIS BULLETIN. IMPROPER INSTALLATION OF FORWARD AND AFT FACSep 11, 2000 · N3237U · Cessna 421C · Passenger Compartment EquipmentSDR 20001016SH018Beam · crackedWHILE PERFORMING ANNUAL INSPECTION, FOUND LEFT ENGINE BEAM WITH 1.50 INCH CRACK ON UPPER CAP. CRACK HAD BEEN STOP DRILLED, BUT THIS IS NOT A LEGAL REPAIR. BEAM MUST BE REPLACED WITH NEW. CESSNA FIELD SERVICE HAD TO ASSIST TO OBTAIN NEW PARTS THAT WOULD FIT.Sep 11, 2000 · N3237U · Cessna 421C · Engine Mount SectionSDR 20001016SH017Window · crackedWHILE REPLACING PRESSURIZATION SEAL ON EMERGENCY EXIT, UPHOLSTERY WAS REMOVED. FOUND OUTER WINDOW BROKEN BETWEEN FASTENER HOLES. PIECES WERE GLUED IN WITH RTV. CAUSE OF FAILURE BELIEVED TO BE IMPROPER INSTALLATION. NEW WINDOW INSTALLED ALONG WITH METAL RETSep 11, 2000 · N3237U · Cessna 421C · Flight Compartment WindowsSDR CA000927006Shaft · loose(CAN) THE FLAPS WOULD NOT MOVE DURING TAXI. PILOTS WERE ADVISED TO ENSURE THE FLAPS WERE RETRACTED, PULL AND SECURE THE FLAP CIRCUIT BREAKER, AND RETURN TO MAINTENANCE FLAPLESS FOR REPAIRS. MAINTENANCE FOUND THE INPUT ROD OR SHAFT THAT MOVES THE CAM TO THE UPAug 27, 2000 · Cessna 421C · Trailing Edge Flap Control SystemSDR CA000927007Static Line · cracked(CAN) DURING CLIMB OUT OF ZWH, PILOT NOTICED A SIGNIFICANT DROP IN AIRSPEED WITH THEALTIMETER & VSI ACTING ERRATICCALLY. THE ALTERNATE PITOT STATIC SOURCE WAS SELECTED & AIRSPEED VSI & ALTIMETER RETURNED TO NORMAL. PRESSURIZATION DIFFERENTIAL INDICATOR STAYED Aug 24, 2000 · Cessna 421C · Pitot/Static SystemSDR 20000808SH018Rivet · frettedDURING ROUTINE INSPECTION, LOOSE RIVETS WERE FOUND IN THE TOP PLATE CURBED AREA AFT OF THE ENGINE IN BOTH MOUNT BEAMS OF LEFT ENGINE. SOME RIVET HEADS HAD FRETTED INTO THE SURFACE OF THE PLATE. THE SUSPECTED CAUSE WOULD BE A VIBRATION IN THIS AREA. AN ENGINJul 24, 2000 · N942SW · Cessna 421C · Engine Air Intake SystemSDR 20000808SH017Rivet · frettedDURING ROUTINE INSPECTION, LOOSE RIVETS WERE FOUND IN THE TOP PLATE CURBED AREA AFT OF THE ENGINE IN BOTH MOUNT BEAMS OF LEFT ENGINE. SOME RIVET HEADS HAD FRETTED INTO THE SURFACE OF THE PLATE. THE SUSPECTED CAUSE WOULD BE A VIBRATION IN THIS AREA. AN ENGINJul 24, 2000 · N942SW · Cessna 421C · Engine Mount SectionSDR 20000609SH018Mount · crackedDURING ANNUAL INSPECTION, FOUND ONE INCH CRACK LEFT SIDE, AFT CORNER, LEFT ENGINE BAY, CANTED BULKHEAD TOP CAP. EXHAUST CORROSION IN THIS AREA WAS NOTED. PER AD 2000-01-16 EXHAUST SYSTEM, FOUND CRACKS ON EXHAUST COMPONENTS ALSO IN THIS AREA THAT MAY HAVE COMay 19, 2000 · N5491G · Cessna 421C · Engine Mount SectionSDR 20000531SH012Hose · rupturedWHILE AT 13,000 FEET, PILOT NOTICED HYDRAULIC ANNUNCIATOR FLICKERING. WITHIN 2-3 MINUTES, PILOT HAD COMPLETE HYDRAULIC FAILURE. PILOT DEPLOYED LANDING GEAR IMMEDIATELY AND STARTED DESCENT. HE GOT 3 GREEN AND CONTINUED DOWN. LANDED WITH NO MISHAP. UPON INSMay 12, 2000 · N49TD · Cessna 421C · Landing Gear Retraction/Extension SystemSDR AU000334Bearing · disintegrated(AUS) STARTER ADAPTER FRONT SUPPORT BEARING DISINTEGRATED. METAL CONTAMINATION OF ENGINE OIL SYSTEM.Apr 27, 2000 · Cessna 421C · Reciprocating Engine Rear SectionSDR 20000912SH028Taper Pin · looseELEVATORS IN ACFT ARE ATTACHED TO A FLANGED COLLAR WITH TAPER PIN, PN 5035017-1. TAPER PIN WORKED LOOSE WHICH OVALED OUT THE HOLES IN THE COLLAR AND TORQUE TUBE. AT INSP, COULD HOLD ONE ELEV RIGID, MOVE OTHER ELEV APPROX 1 INCH ON BOTH SIDES. CESSNA TECH REApr 26, 2000 · N88EQ · Cessna 421C · Elevator Control SystemSDR AU000335Seal · worn(AUS) BRAKE MASTER CYLINDER LOC O SEAL'' FAILED.Apr 8, 2000 · Cessna 421C · Master Cylinder/Brake ValveSDR 20000427SH027Spar · crackedA CRACK INDICATION WAS NOTED IN THE LT FORWARD UPPER WING SPAR. THE CRACK INDICATION IS ABOVE THE OUTBOARD HI-LOK AND RUNS SPANWISE. THE INDICATION IS .765 INCH PLUS/MINUS LONG AND IS .3401 PLUS/MINUS ABOVE THE HI-LOK. INSPECTION WAS PERFORMED PER AD 91-25Mar 17, 2000 · N60RR · Cessna 421C · Wing SparSDR 20000427SH026Wye Duct · crackedWYE WAS CRACKED IN 2 PLACES ON A WELDMENT. (X)Mar 17, 2000 · N60RR · Cessna 421C · Engine Collector/Tailpipe/NozzleSDR 20000403SH002Stud · failedDURING NORMAL ENGINE OPERATION, NOTICED OIL LEAK ON FRONT OF ENGINE. AFTER CLEANING AND INSPECTION, FOUND THE FRONT THROUGH-STUD BROKEN. POSSIBLE CAUSE COULD BE IMPROPER HARDENING OF THE BOLT. (X)Mar 6, 2000 · N421LH · Cessna 421C · Reciprocating Engine Cylinder SectionSDR 2000ZZZX567Gear · damagedON ROLL-OUT AFTER LANDING, PILOT OBSERVED THE ENGINE HAD SHUT DOWN. ON ATTEMPTED START, THERE WAS NO PROPELLER MOVEMENT. STARTER WAS CHECKED ON THE BENCH, AND STARTER ADAPTER WAS REMOVED FOR ENGINE TO REVEAL SEVERE GEAR DAMAGE TO THE MAIN CRANKSHAFT GEAR ANDJan 11, 2000 · N421PJ · Cessna 421C · Reciprocating Engine Power SectionSDR 2000ZZZX111Capacitor · failedUPON INITIAL INSTALLATION OF FACTORY REBUILT COMBUSTION HEATER ASSEMBLY, ATTEMPTED OPERATIONAL CHECK OF HEATER. ATTEMPTED TO ENERGIZE HEATER IGNITION CIRCUIT RESULTED IN IMMEDIATE TRIP OF HEATER CIRCUIT BREAKER. FOUND CAPACITOR SHORTED. PART TOTAL TIME UNKNODec 23, 1999 · N81RD · Cessna 421C · Heating SystemSDR 99ZZZX4140Shaft Gear · brokenAFTER A FLIGHT FROM CPK TO FRANKFORT, KY, PILOT TRIED TO START THE RIGHT ENGINE AND IT WOULD NOT START. A MECHANIC TRIED TO START IT ALSO AND ONLY THE STARTER MOTOR WOULD SPIN. THE MECHANIC REMOVED THE STARTER GEAR AND FOUND THE TEETH GONE. ENGINE WAS PLACEOct 11, 1999 · N49TD · Cessna 421C · Engine StarterSDR 99ZZZX4549Support Pin · failedFOREIGN OBJECT DAMAGE WITHIN LEFT ENGINE ASSEMBLY CAUSED IDLER GEAR SUPPORT PIN BETWEEN MAGNETO DRIVES TO SHEAR CAUSING MOUNT STUDS TO BREAK AND THE GEAR IT RIDES ON TO ROTATE AND BECOME UNMESHED. IT AFFECTED MAGNETO TIMING AND CAUSED ENGINE TO LOSE POWER ANDSep 21, 1999 · N6VH · Cessna 421C · Reciprocating Engine Rear SectionSDR CA990927042Beam · cracked(CAN) DURING SCHEDULED INSPECTION, CRACKS WERE DETECTED ON BEAM CAP AT EITHER END OF THE PART, CLOSE / NEXT TO THE LONGITUDINAL ENGINE MOUNT BEAMS. PART IS SITUATED DIRECTLY UNDER THE TURBOCHARGER.Sep 14, 1999 · Cessna 421C · Engine Mount SectionSDR 99ZZZX3590Windscreen · failedAIRCRAFT WAS AT 17,000 FEET, WHEN IT EXPERIENCED A CATASTROPHIC FAILURE OF THE PILOT'S WINDSCREEN CAUSING INSTANT DEPRESSURIZATION OF CABIN. CAUSE OF THIS FAILURE AT THIS TIME IS UNKNOWN. A POSSIBILITY IS THAT THE WINDSCREENS WERE REWORKED TO REMOVE SCRATCHESep 11, 1999 · Cessna 421C · Flight Compartment WindowsSDR 99ZZZX3611Transponder · intermittentREMOVED KXP 755 TRANSPONDER FROM AIRCRAFT. FOUND RECEIVER INTERMITTENT, FOUND BURST CLOCK TOO LONG, CHANGED COIL AND ASSOCIATED PARTS, FOUND POWER OUTAGE ONLY 10 WATTS, AND FREQUENCY UNRECOGNIZABLE. SWAPPED CAVITIES AND FOUND LOWER SUPPLY TOO LOW, TREAD PROBAug 1, 1999 · N510DB · Cessna 421C · ATC Transponder SystemSDR 99ZZZX2804Bearing Plate · misinstalledLOWER RUDDER BEARING PLATE INSTALLED BY MANUFACTURER UPSIDE DOWN ALLOWING BEARINGS TO MOVE DOWN, FROM WEIGHT OF RUDDER, CAUSING RUDDER INTERFERENCE WITH CLOSE-OUT FAIRING AT TOP SIDE OF HORIZONTAL.Jul 13, 1999 · N762CA · Cessna 421C · Rudder StructureSDR 99ZZZX2802Bearing Plate · misinstalledLOWER RUDDER BEARING PLATE INSTALLED BY MFG UPSIDE DOWN ALLOWING BEARINGS TO MOVE DOWN, FROM WEIGHT OF RUDDER, CAUSING RUDDER INTERFERENCE WITH CLOSE-OUT FAIRING AT TOP SIDE OF HORIZONTAL.Jul 13, 1999 · N6793V · Cessna 421C · Rudder StructureSDR 99ZZZX2957Elt · inoperatableUNIT WILL NOT TRANSMIT. INSTALLED 5-7-98 AS A REPLACEMENT FOR ANOTHER AK-450 WITH SAME PROBLEM.Jul 7, 1999 · N421RX · Cessna 421C · Emergency Locator BeaconSDR 99ZZZX2645Sight Gauge · splitHYDRAULIC LEAK IN NOSE COMPARTMENT. INSPECTION REVEALED RESERVOIR SIGHT TUBE SPLIT AT TOP AND BOTTOM ATTACH TO RESERVOIR. TUBE WAS PURCHASED NEW AND INSTALLED APPROXIMATELY 50 HOURS BEFORE. TUBE ALSO REPLACED ON SECOND AIRCRAFT, SN 421C0236. INSPECTION REVJul 5, 1999 · N421WT · Cessna 421C · Hydraulic Reservoir, MainSDR 99ZZZX2378Bearing Plate · misinstalledAFTER HAVING BEEN ALERTED TO THE POSSIBILITY BY PUBLISHED REPORTS, INSPECTED LOWER RUDDER PIVOT BEARING SUPPORT PLATE AND FOUND IT TO HAVE BEEN INSTALLED UPSIDE DOWN. RECORDS INDICATE THIS IS THE ORIGINAL FACTORY INSTALLATION.May 26, 1999 · N81RD · Cessna 421C · Rudder StructureSDR 99ZZZX2395Engine · failedOIL PRESSURE DROPPED, ENGINE PROPELLER STARTED SLOWING. PILOT FEATHERED PROPELLER AND MADE SAFE, PRECAUTIONARY LANDING. APPEARS ENGINE HAD CATASTROPHIC FAILURE. CRANK, ROD, OR COUNTERWEIGHT HAD COME APART. SUBMITTER STATED TOO EARLY IN INVESTIGATION TO NAMMay 1, 1999 · N5488G · Cessna 421C · Engine (Reciprocating)SDR 99ZZZX2275Crack · crackedPILOT REPORTED EXCESSIVE OIL LEAK ON RIGHT ENGINE CAWLING PULLED AND 3 INCH - 4 INCH CRACK NOTED AT NR 5 CYLINDR BASE. IDENTIDAL PROBLEM OCCURRED.May 1, 1999 · N421GF · Cessna 421C · Engine (Reciprocating)SDR 99ZZZX2411Ramp · brokenDURING PRE-FLIGHT, RAMP ON REAR OF NOSE GEAR THAT CONTACTS ARM TO CLOSE NOSE GEAR DOORS WAS FOUND BROKEN. SUBMITTER SUSPECTED DAMAGE OCCURRED FROM TOWING WITH NOSE GEAR LIFTING CRADLE THAT HAS STRAP TO SECURE NOSE GEAR. SUGGEST CAUTION PLACARD BE PLACED ON NApr 12, 1999 · N5478G · Cessna 421C · Landing Gear Retraction/Extension SystemSDR 99ZZZX1733Fuel Line · brokenPILOT LANDED AND STATED THAT DURING FLIGHT, THE LEFT ENGINE STARTED TO VIBRATE AND EGT INDICATION ON NR 4 CYLINDER WENT TO ZERO. PILOT ELECTED TO SHUT DOWN THE LEFT ENGINE, FEATHER THE PROPELLER AND CONTINUE ON TO HOME BASE. INSPECTION OF THE LT ENGINE NR 4 Apr 12, 1999 · N264DC · Cessna 421C · Aircraft Fuel Distribution SystemSDR 99ZZZX1454Pitot System · contaminatedDURING CRUISE FLIGHT AFTER BEING ON THE GROUND IN A RAINSTORM, THE PILOT'S INSTRUMENTS BEGAN ACTING ERRATICALLY. THE PILOT'S AIRSPEED WENT TO ZERO THEN 240 KNOTS. COPILOT'S INSTRUMENTS READ APPROPRIATELY. CLEARING THE ENTIRE SYSTEM OF MOISTURE, THEN PERFORMINMar 11, 1999 · N321FL · Cessna 421C · Pitot/Static SystemSDR 99ZZZX1358Line · chafedTHIS AIRCRAFT INCORPORATES PRATT & WHITNEY PT6-135A ENGINES INSTALLED IAW STC SA136150. INSPECTION REVEALED SEVERE CHAFING OF THE SECONDARY FUEL PRESSURE TUBE ASSEMBLIES OF BOTH ENGINES APPROXIMATEY 2.50 INCHES AFT OF THE TUBE FORWARD ENDS DUE TO CONTACT WITH Mar 2, 1999 · N81RD · Cessna 421C · Aircraft Fuel Distribution SystemSDR 99ZZZX1004Terminal Strip · failedCONNECTOR LUGS ON CABLES FROM ALTERNATORS TO TERMINAL STRIP CORRODED CAUSING HIGH RESISTANCE AND OVERHEATING UNDER FULL ALTERNATOR LOAD, NR 1 TERMINAL POST MELTED AWAY FROM TERMINAL STRIP ALLOWING PRIMARY DC WIRING TO CONTACT AIRFRAME STRUCTURE. RESULT: DUALMar 2, 1999 · N421SR · Cessna 421C · Electrical Power SystemSDR 99ZZZX1200Bolt · brokenWHILE TROUBLESHOOTING AN OIL LEAK, THE LOWER THRU-BOLT BETWEEN THE NR 4 AND NR 5 CYLINDER WAS FOUND BROKEN APPROXIMATELY .50 INCH FROM THE END. AFTER CYLINDER REMOVAL AND COMPLETE CRANKCASE AND TORQUE INSPECTION, NO OTHER DEFECTS WERE FOUND.Mar 1, 1999 · N215MP · Cessna 421C · Reciprocating Engine Power SectionSDR 99ZZZX1049Window · crackedDURING AIRFRAME REFURBISHMENT, EMERGENCY EXIT WINDOW WAS FOUND CRACKED AND BROKEN BETWEEN PERIPHERY OF WINDOW AND SCREW HOLES AT 6 CONSECUTIVE HOLE LOCATIONS. RETAINER RING HAD BEEN PREVIOUSLY INSTALLED. DAMAGE WAS NOT APPARENT UNTIL RING WAS REMOVED FOR WINFeb 26, 1999 · N81RD · Cessna 421C · Passenger Compartment Windows
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