Cessna 421C

Service difficulty reports · 427

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 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 96ZZZX703Atttach Lug · brokenPILOT REPORTED 'GEAR UNLOCKED' LIGHT STAYED ON WHEN GEAR SELECTED UP AFTER TAKEOFF. AFTER A FLYBY, TOWER TOLD HIM NOSE GEAR WAS HANGING DOWN, IN TRAIL. PILOT SELECTED GEAR DOWN AND ALL 3 GREEN DOWN AND LOCKED LIGHTS CAME ON AS THE UNLOCKED LIGHT WENT OUT. ANov 30, 1995 · N888HT · Cessna 421C · Landing Gear Retraction/Extension SystemSDR 96ZZZX345Attach Lug · failedPILOT REPORTED 'GEAR UNLOCKED' LIGHT STAYED ON WHEN GEAR SELECTED UP AFTER TAKEOFF. AFTER A FLY-BY, THE TOWER TOLD PILOT NOSE GEAR WAS HANGING DOWN, IN TRAIL. PILOT SELECTED GEAR DOWN AND ALL 3 GREEN DOWN AND LOCKED LIGHTS CAME ON AS THE UNLOCKED LIGHT WENT Nov 30, 1995 · N888HT · Cessna 421C · Landing Gear Retraction/Extension SystemSDR CA951212007O-Ring · worn(CAN)WHILE COMPLYING WITH AD 90-02-13, THE L/H AND R/H PIN SUPPORT RINGS (SEAL SUPPORTS) WERE REMOVED AND FOUND TO HAVE RIPPED AND MISSING PHENOLIC TAPE ON THE INNER SURFACE. FOUR NEW PIN SUPPORT RINGS WER E INSTALLED IN BOTH GEAR.Nov 25, 1995 · Cessna 421C · Main Landing Gear Strut/Axle/TruckSDR 96ZZZX3083Sleeve · air leakPILOT REPORTED HAVING A LOW FUEL FLOW INDICATION. INSPECTION REVEALED AN AIR LEAK IN THE UPPER DECK, NR 3 CYLINDER SLEEVE, WHERE THE SHAFT AND BLOCK CONNECT. SUBMITTER RECOMMENDS VISUAL INSPECTION AND IF NECESSARY, PART REPLACEMENT.Nov 21, 1995 · N37404 · Cessna 421C · Reciprocating Engine Cylinder SectionSDR CA960311004Magneto · out of adjust(CAN) ON TAKEOFF, THE LEFT ENGINE SUFFERED A POWER LOSS, CAUSING A YAW TO THE LEFT. THE PILOT WAS UNABLE TO CONTROL OR STOP THE AIRCRAFT DUE TO ICY CONDITIONS AND THE AIRCRAFT RAN OFF THE END OF THE RUNWAY INTO GRASS AND BUSHES. INSPECTION BY MAINTENANCE REVNov 20, 1995 · Cessna 421C · Magneto/DistributorSDR 95ZZZX6734Control · bindingNUMEROUS INSTANCES OF PRESSURE AIR TEMPERATURE CONTROLS BINDING OR FAILING WHEN COCKPIT KNOB TURNED TO VARY AIR TEMPERATURE FOR COMFORT. HEAT EXCHANGER SHUTTERS BIND UP AND STAYS IN ONE POSITION. SUBMITTER SUGGESTS PART NEEDS REDESIGN; MAINTENANCE PROCEDURESNov 16, 1995 · N331JH · Cessna 421C · Cabin Pressure ControllerSDR 95ZZZX6401Pump · failedTHE VACUUM PUMP WAS OVERHAULED BY REPAIR STA NR 766-44. THE TIME SINCE OVERHAUL WAS 813 HOURS. SUBMITTER STATES THIS IS ABOUT NORMAL SERVICE LIFE FOR THIS TYPE OF PUMP, AND IS EVEN BETTER FOR AN OVERHAULED UNIT.Oct 26, 1995 · N265JJ · Cessna 421C · Vacuum Distribution SystemSDR 95ZZZX6053Crankcase · crackedINSPECTION FOUND CRACK IN CRANKCASE STARTING AT TOP CASE FLANGE BOLT DOWN UNDER ENGINE DATA PLATE, THEN DOWN BETWEEN NR 3 AND NR 5 CYLINDERS. CRACK IS 8 INCHES LONG. LEFT ENGINE HAD A CRACK SAME AREA 96 HOURS AGO.Oct 17, 1995 · N6834C · Cessna 421C · Reciprocating Engine Power SectionSDR 95ZZZX6303Adapter Assy · failedTHE OPERATOR INCURRED A STARTER ADAPTER FAILURE THAT CONTAMINATED THE ENGINE. DISASSEMBLY OF THE ENGINE REVEALED THAT BEARING, PN 537721, HAD FAILED FIRST CAUSING THE STARTER ADAPTER TO BIND AS IT ROTATED WHICH CAUSED IT TO FAIL. THE ADAPTER HAD BEEN REMOVEDSep 25, 1995 · N2683Y · Cessna 421C · Reciprocating Engine Rear SectionSDR 95ZZZX5931Control Arm · misadjustedGEAR WOULD NOT UNLOAD IN UP POSITION WHEN RETRACTED IN SHOP. FOUND RIGHT GEAR DOOR OUTBOARD END HAD LOOSE LOCKNUT. SUSPECT MECHANIC ADJUSTED DOOR AND DID NOT TIGHTEN NUT. IF DOOR WAS LATER DISCONNECTED, THE CONTROL ARM COULD HAVE BEEN MOVED INADVERTENTLY WHSep 12, 1995 · N421CV · Cessna 421C · Landing Gear Door Retract SectionSDR 95ZZZX3576Window · crackedAIRCRAFT HAD PROBLEMS WITHHOLDING PRESSURIZATION. FOUND 1 WINDOW WITH 50 PERCENT OF THE SCREW HOLES WITH CRACKS. CRACKS WERE FOUND AFTER PRESSURIZING THE AIRCRAFT AND PUTTING SOAP ON WINDOWS. AFTER REMOVING THE RETAINERS, CRACKS WERE FOUND WHERE MARKED. WIJun 26, 1995 · N43H · Cessna 421C · Passenger Compartment WindowsSDR 95ZZZX3575Window · crackedAIRCRAFT HAD PROBLEMS WITH HOLDING PRESSURIZATION. FOUND 1 WINDOW WITH 50 PERCENT OF THE SCREW HOLES WITH CRACKS. CRACKS WERE FOUND AFTER PRESSURIZING THE AIRCRAFT AND PUTTING SOAP ON WINDOWS. AFTER REMOVING RETAINERS, CRACKS WERE FOUND WHERE MARKED. WINDOJun 26, 1995 · N43H · Cessna 421C · Passenger Compartment WindowsSDR 95ZZZX3574Window · crackedAIRCRAFT HAD PROBLEMS WITH HOLDING PRESSURIZATION. FOUND 5 CABIN WINDOWS WITH CRACKS GOING THROUGH 50 PERCENT OF THE SCREW HOLES. CRACKS FOUND AFTER PRESSURIZING THE AIRCRAFT AND PUT SOAP ON WINDOWS. AFTER REMOVING RETAINERS, CRACKS WERE WHERE THEY WERE MARJun 26, 1995 · N43H · Cessna 421C · Passenger Compartment WindowsSDR 95ZZZX3213Bushing · splitFOUND NR 1 PISTON PIN ROD BUSHINGS CRACKED CIRCUMFERENCE WISE .3750 INCH AND SPLIT ABOUT .0312 INCH. FOUR OUT OF 6 BUSHINGS CRACKED. NR 2 CYLINDERS WERE REMOVED FOR LOW COMPRESSION AT ANNUAL.Jun 15, 1995 · N525RG · Cessna 421C · Reciprocating Engine Cylinder SectionSDR 95ZZZX4480Ring Pack · wornRIGHT MAIN STRUT LEAKING HYDRAULIC FLUID. DISASSEMBLED STRUT AND FOUND RING PACK SUPPORT INNER BEARING MATERIAL LOOSE, WORN AND TORN. REPLACED RING PACK SUPPORT AND O-RINGS. NORMAL WEAR AND POSSIBLE ROUGH GEAR HANDLING.May 22, 1995 · N3968G · Cessna 421C · Main Landing Gear Strut/Axle/TruckSDR 95ZZZX3138Support · crackedFOUND CRACK IN ENGINE MOUNT TOP SUPPORT OF BEAM. LOCATED ON LT SIDE. THIS SUPPORT ALSO SUPPORTS THE TURBOCHARGER BRACE. THIS PART IS THE REAR CROSSOVER OF THE ENGINE BEAM.May 4, 1995 · N110KU · Cessna 421C · Engine Mount SectionSDR 95ZZZX2405Fitting · corrodedDURING MAJOR AIRFRAME REPAIR WITH WINGS OFF, INSPECTION OF THE WING ATTACH FITTINGS REVEALED BOTH LEFT AND RIGHT UPPER MAIN SPAR FITTINGS HAD INTERGRANULAR CORROSION AT THE POINT WHERE THE FITTINGS CAME OUT OF THE FUSELAGE SPAR ASSEMBLY. THERE WAS NO APPARENTApr 28, 1995 · N421CC · Cessna 421C · Wing, Attach FittingsSDR 95ZZZX2645Crankcase · crackedDURING INSPECTION, FOUND CASE CRACKED THROUGH NR 5 CYLINDER STUD AT 5 O'CLOCK POSITION, APPROXIMATELY 1 INCH IN LENGTH. CRACK WAS LEAKING OIL.Apr 26, 1995 · N6866L · Cessna 421C · Reciprocating Engine Power SectionSDR 95ZZZX2644Crankcase · crackedDURING INSPECTION, FOUND CASE CRACKED THROUGH NR 5 CYLINDER STUD AT 5 O'CLOCK POSITION, APPROXIMATELY 1 INCH IN LENGTH. CRACK WAS LEAKING OIL.Apr 26, 1995 · N6866L · Cessna 421C · Reciprocating Engine Power SectionSDR 95ZZZX1450Wye Collector · crackedDURING A ROUTINE INSPECTION, THE EXHAUST Y-COLLECTOR WAS FOUND WITH A ONE INCH CRACK. AN EXHAUST STAIN WAS PRESENT. RECOMMEND A THOROUGH INSPECTION OF THE EXHAUST SYSTEM EVERY 100 HOURS, ESPECIALLY ON LARGE TURBOCHARGED ENGINES. AD 75-23-08 R5 PERTAINS TO TMar 4, 1995 · N100QC · Cessna 421C · Engine Collector/Tailpipe/NozzleSDR 95ZZZX1166Shaft Gear · failedDURING DISASSEMBLY OF THIS ENGINE, THE 'NEW STYLE' STARTER CLUTCH (REF: SB M92-10) GEAR GEETH WERE STARTING TO FAIL. ALSO, REF: CRITICAL SB 94-4.Feb 16, 1995 · N88604 · Cessna 421C · Reciprocating Engine Rear SectionSDR 95ZZZX1165Shaft Gear · failedDURING DISASSEMBLY OF THIS ENGINE, THE 'NEW STYLE' STARTER CLUTCH (REF: SB M92-10) GEAR TEETH WERE STARTING TO FAIL. ALSO, REF: CRITICAL SB 94-4.Feb 16, 1995 · N88604 · Cessna 421C · Reciprocating Engine Rear SectionSDR 95ZZZX803Retainer · brokenANOTHER OPERATOR OF CESSNA 421'S ADVISED THE NEED TO REMOVE VALVE SPRINGS TO CHECK THE SPRING RETAINER (PN 642343) FOR BREAKAGE DUE TO VALVE GUIDE NOT BEING INSTALLED ALL THE WAY - THEREBY CAUSED 'ROCKING' AS SEAT IS HELD OFF OF CYLINDER. THIS OPERATOR DISCOVEJan 31, 1995 · N234CN · Cessna 421C · Reciprocating Engine Cylinder SectionSDR 95ZZZX1104Dampener · separatedFOUND METAL IN OIL. FOUND REAR ACCESSORY CASE JOURNAL HOLDING STARTER ADAPTER SHAFT SEVERELY WORN AND WALLOWED OUT. VISCOUS DAMPENER SEPARATED FROM HUB.Jan 31, 1995 · N6794D · Cessna 421C · Reciprocating Engine Rear SectionSDR 95ZZZX797Beam · crackedUPON REMOVING LEFT ENGINE FOR TBO REPLACEMENT, INSPECTION OF THE NACELLE STRUCTURE REVEALED THE AFT ENGINE BEAM WAS CRACKED AT THE BEND WHERE THE OUTBOARD TAB ATTACHES TO THE FORE AND AFT ENGINE BEAM. THE CRACK IS APPROXIMATELY ONE INCH LONG AND ORIGINATES FRJan 23, 1995 · N58ZP · Cessna 421C · Engine Mount SectionSDR 95ZZZX746Stud · shearedAIRCRAFT MADE AN EMERGENCY LANDING DUE TO PROBLEM WITH LT ENGINE. 1) INVESTIGATION REVEALED NR 5 CYL TOP 4 CYL HOLD-DOWN STUDS SHEARED OFF AND MOVEMENT OF CYL TOP AWAY FROM ENG CASE CAUSED A LARGE CRACK IN THE ENG CASE COMING FROM LOWER CYL FLANGE AREA. 2) Jan 7, 1995 · N593C · Cessna 421C · Reciprocating Engine Power SectionSDR 95ZZZX745Stud · shearedAIRCRAFT MADE AN EMERGENCY LANDING DUE TO PROBLEM WITH LT ENGINE. 1) INVESTIGATION REVEALED NR 5 CYL TOP 4 CYL HOLD-DOWN STUDS SHEARED OFF AND MOVEMENT OF CYL TOP AWAY FROM ENG CASE CAUSED A LARGE CRACK IN THE ENG CASE COMING FROM LOWER CYL FLANGE AREA. 2) Jan 7, 1995 · N593C · Cessna 421C · Reciprocating Engine Power Section
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