# Service difficulty reports: Cessna 421A A list on [Cessna 421A](https://openairdocs.org/model/cessna-421a.md). Newest first. General aviation reporting is voluntary. - [SDR 2014FA0000615](https://openairdocs.org/sdr/2014FA0000615.md): Trunnion · failed · May 24, 2014 · N936U · Cessna 421A · Fuselage, Landing Gear Attach Fittings > THE RT MAIN GEAR COLLAPSED DUE TO A BROKEN LANDING GEAR OVER-CENTER DOWNLOCK AND THAT THE LANDING GEAR EXTENSION/RETRACTION TORQUE TUBE HAD CAUSED AN OVERLOAD CONDITION ON ITS MOUNTING/PIVOT BOSS ON THE RT MLG. THIS OVERLOAD CONDITION MAY HAVE BEEN CAUSED BY - [SDR 2013FA0000425](https://openairdocs.org/sdr/2013FA0000425.md): Bolt · sheared · May 1, 2013 · N216WA · Cessna 421A · Landing Gear Retraction/Extension System > LEFT MAIN GEAR COLLAPSED ON LANDING ROLLOUT, PIC ADVISED 3 GREENS ON APPROACH, NORMAL LANDING UNTIL ACFT SETTLED ON GEAR AND LT SIDE COLLAPSED. WINDS LIGHT. ACFT PULLED LEFT INTO GRASS AND STRUCK LIGHTS AND POLE. LEFT ENGINE PROP SHOWS CURLED TIPS DUE TO GR - [SDR 2013FA0000358](https://openairdocs.org/sdr/2013FA0000358.md): Bolt · sheared · May 1, 2013 · N216WA · Cessna 421A · Landing Gear Retraction/Extension System > LEFT MAIN GEAR COLLAPSED ON LANDING. PIC ADVISED 3 GREENS ON APPROACH, NORMAL LANDING UNTIL ACFT SETTLED ON GEAR AND LEFT SIDE COLLAPSED. WINDS LIGHT, ACFT PULLED LEFT INTO GRASS AND STRUCK LIGHTS AND POLE. LEFT ENGINE PROP SHOWS CURLED TIPS DUE TO GROUND S - [SDR CA110804002](https://openairdocs.org/sdr/CA110804002.md): Pin · cracked · Jul 29, 2011 · Cessna 421A · Propeller Assembly > PROPELLER INSTALLED AS NEW ON AUG.8,2003. UPON ENGINE SHUTDOWN THE PROPELLER WOULD NOT LATCH AND TRAVELLED TO THE FULL FEATHER POSITION. WHEN THE CYLINDER WAS REMOVED IT WAS FOUND THAT THE LATCH PINS HAD FAILED. - [SDR D382008F00000](https://openairdocs.org/sdr/D382008F00000.md): Thru Bolt · broken · Aug 29, 2008 · N421RM · Cessna 421A · DC Generator-Alternator > 22.2 HOURS AFTER INSTALLING AN OVERHAULED (ALV9510) ALTERNATOR, THE PILOT CAME TO ME ABOUT A THRU BOLT THAT WAS COMING OUT OF THE ALTERNATOR CASE. THERE WAS ONE THRU BOLT STICKING OUT OF THE CASE AND ANOTHER HAD COME OUT AND WAS GONE. THE ALTERNATOR WAS CHARGI - [SDR 01676201](https://openairdocs.org/sdr/01676201.md): Bolt · failed · Jun 21, 2006 · N216WA · Cessna 421A · Main Landing Gear Strut/Axle/Truck > LANDING GEAR COLLAPSED DURING ROLLOUT AFTER LANDING. UPON INSPECTION IT WAS NOTED THAT A BOLT CONNECTING THE DOWNLOCK BELLCRANK TO THE UPPER STRUT ASSEMBLY HAD FAILED. THE BOLT HEAD WAS MISSING ALLOWING ALL OF THE FORCE FROM THE BELLCRANK TO BE APPLIED DIRECTL - [SDR 2006FA0000626](https://openairdocs.org/sdr/2006FA0000626.md): Cable · shorted · Jun 12, 2006 · N99VK · Cessna 421A · Electrical Power System Wiring > DURING STARTING OF LT ENGINE, SMOKE WAS OBSERVED COMING FROM THE LOUVERS ON TOP OF THE LT ENGINE. THE ENGINE WAS SHUTDOWN AND THE SMOKE SUBSIDED. INSP REVEALED THAT THE 2-GAUGE STARTER AND ALTERNATOR POWER CABLES WERE BURNED IN HALF NEAR THE TURBOCHARGER. F - [SDR 000](https://openairdocs.org/sdr/000.md): Bolt · departed · Mar 31, 2006 · N849JB · Cessna 421A · Main Landing Gear Strut/Axle/Truck > WHILE TAXING TO PARK THE RT MLG LINK ASSEMBLY BOLT CAME OUT CAUSING THE UPPER AND LOWER LINKS TO SEPERATE. THE RT LANDING GEAR TURNED 90 DEGREES BENDING THE GEAR DOOR COVER. - [SDR CA040105004](https://openairdocs.org/sdr/CA040105004.md): Strut · cracked · Dec 16, 2003 · Cessna 421A · Main Landing Gear Strut/Axle/Truck > (CAN) LT MAIN LANDING GEAR COLLAPSED UPON TOUCH-DOWN WITH ALL 3 GREEN LIGHTS ON. FOUND DOWN LOCK ARM BROKEN AWAY FROM LUG ON TOP END OF STRUT. LOCK ARM NORMALLY HOLDS SIDE BRACE IN PLACE AND ACTUATES DOWN SWITCH. REPLACED COMPLETE MAIN LANDING GEAR ASSEMBLY - [SDR 2003F00283](https://openairdocs.org/sdr/2003F00283.md): Gear · broken · Apr 1, 2003 · N421A · Cessna 421A · Reciprocating Engine Power Section > REMOVED RIGHT INOPERATIVE ALTERNATOR FOR REPAIR AND NOTED. CRANKCASE DAMAGED, ALTERNATOR FACE GEAR, BROKEN AND LOOSE. FACE GEAR ATTACH BOLTS, DAMAGED AND LOOSE. (M) - [SDR CA030210003](https://openairdocs.org/sdr/CA030210003.md): Windshield · failed · Jan 13, 2003 · Cessna 421A · Flight Compartment Windows > (CAN) WHILE CLIMBING TO FL190, AT APPROXIMATELY FL180 THE COPILOTS WINDSCREEN DEPARTED THE AIRCRAFT RESULTING IN INSTANTANEOUS DECOMPRESSION. OTHER COCKPIT ITEMS ALSO DEPARTED IE, GLARE SHIELD, SUN VISOR DOCUMENTS ETC. AIRCRAFT EMERGENCY DESCENDED TO FL110, RE - [SDR CA030116003](https://openairdocs.org/sdr/CA030116003.md): Shaft · broken · Jan 13, 2003 · Cessna 421A · Engine Starter > (CAN) ON DEPARTURE, ENGINE START RT ENGINE NO ROTATION. PILOT CALL MAINTENANCE. MAINTENANCE FOUND THAT STARTER CLUTCH WAS LOOSE. DISMANTLE, FOUND BAD GEAR ON SHAFT THAT IS RUNNING ON CRANKSHAFT GEAR. ENGINE REMOVED AND SEND TO REPAIR SHOP. - [SDR 20000523SH021](https://openairdocs.org/sdr/20000523SH021.md): Link · separated · Apr 13, 2000 · N2989Q · Cessna 421A · Landing Gear Retraction/Extension System > THE LINK SEPARATED IN THE THREADED AREA WHERE IT ENTERS THE ROD-END IN THE LINK ASSY. THIS IS PART OF BELLCRANK 5041001-2. THE FAILURE CAUSED THE RIGHT MAIN GEAR TO COME OUT OF OVERCENTER IN THE DOWN POSITION AND THEN COLLAPSE. (X) - [SDR 98ZZZX4571](https://openairdocs.org/sdr/98ZZZX4571.md): Shaft Gear · broken · Nov 15, 1998 · N200CH · Cessna 421A · Starter-Generator > GEARS ON SHAFT GEAR BROKEN OFF WHICH CAUSED SHAFT GEAR TO DAMAGE CASE WHERE PILOT BEARING GOES. - [SDR EY2R9601443](https://openairdocs.org/sdr/EY2R9601443.md): Piston Rod Assy · worn · Mar 1, 1996 · Cessna 421A · Propeller Assembly > PROP PISTON ROD ASSY WORN - [SDR EY2R9601441](https://openairdocs.org/sdr/EY2R9601441.md): Piston Rod Assy · worn · Mar 1, 1996 · Cessna 421A · Propeller Assembly > PROP PISTON ROD ASSY WORN - [SDR EY2R9600447](https://openairdocs.org/sdr/EY2R9600447.md): Hub · corroded · Mar 1, 1996 · Cessna 421A · Propeller Hub Section > HUB FOUND WITH CORROSION. - [SDR EY2R9600446](https://openairdocs.org/sdr/EY2R9600446.md): Nut · corroded · Mar 1, 1996 · Cessna 421A · Propeller Assembly > NUT CORRODED. - [SDR EY2R9600445](https://openairdocs.org/sdr/EY2R9600445.md): Retain Bearing · corroded · Mar 1, 1996 · Cessna 421A · Propeller Assembly > RETAIN BEARING CORRODED. - [SDR EY2R9600444](https://openairdocs.org/sdr/EY2R9600444.md): Dowel · corroded · Mar 1, 1996 · Cessna 421A · Propeller Assembly > DOWEL CORRODED. - [SDR EY2R9600443](https://openairdocs.org/sdr/EY2R9600443.md): Cylinder Pin · corroded · Mar 1, 1996 · Cessna 421A · Propeller Assembly > CYLINDER PIN FOUND CORRODED. - [SDR EY2R9600442](https://openairdocs.org/sdr/EY2R9600442.md): Blade · corroded · Mar 1, 1996 · Cessna 421A · Propeller Blade Section > BLADE, SN B16100YS, FOUND CORRODED. - [SDR EY2R9600441](https://openairdocs.org/sdr/EY2R9600441.md): Hub · corroded · Mar 1, 1996 · Cessna 421A · Propeller Hub Section > CORROSION FOUND ON HUB. - [SDR EY2R9600440](https://openairdocs.org/sdr/EY2R9600440.md): Nut · corroded · Mar 1, 1996 · Cessna 421A · Propeller Assembly > NUT CORRODED. - [SDR EY2R9600439](https://openairdocs.org/sdr/EY2R9600439.md): Ferrule · corroded · Mar 1, 1996 · Cessna 421A · Propeller Assembly > CORROSION FOUND ON FERRULE. - [SDR 96ZZZX798](https://openairdocs.org/sdr/96ZZZX798.md): Quill Shaft · failed · Jan 26, 1996 · N200CH · Cessna 421A · Reciprocating Engine Rear Section > LEFT ENGINE QUIT ON CLIMB-OUT. PROP FEATHERED AIRCRAFT, MADE SAFE LANDING. FOUND HOLE IN CASE UNDER INTERCOOLER FROM FAILED CONNECTING ROD. PROP TURNS FREELY. ENGINE NOT TORN DOWN AT THIS DATE. SUBMITTER SUSPECTS QUILL SHAFT FAILED ALLOWING ENGINE TO OVER - [SDR 96ZZZX179](https://openairdocs.org/sdr/96ZZZX179.md): Bearing · failed · Nov 30, 1995 · N2219Q · Cessna 421A · Reciprocating Engine Rear Section > PILOT REPORTED LOWER OIL PRESSURE, RT ENGINE. TROUBLESHOT TO BROKEN TOOTH ON STARTER ADAPTER SHAFT AND FAILED BEARING IN CRANKCASE. BEARING SUPPORT WAS OVERSIZED, FILLING ENGINE OIL SYSTEM WITH METAL. NO PREVIOUS INDICATION OF C/W TCM CSB NR 94-4 COULD BE F - [SDR 96ZZZX178](https://openairdocs.org/sdr/96ZZZX178.md): Shaft Tooth · broken · Nov 30, 1995 · N2219Q · Cessna 421A · Reciprocating Engine Rear Section > PILOT REPORTED LOWER OIL PRESSURE, RT ENGINE. TROUBLESHOT TO BROKEN TOOTH ON STARTER ADAPTER SHAFT AND FAILED BEARING IN CRANKCASE. BEARING SUPPORT WAS OVERSIZED, FILLING ENGINE OIL SYSTEM WITH METAL. NO PREVIOUS INDICATION OF C/W TCM CSB NR 94-4 COULD BE F - [SDR 95ZZZX5928](https://openairdocs.org/sdr/95ZZZX5928.md): Shaft · sheared · Jun 16, 1995 · N422RD · Cessna 421A · Reciprocating Engine Front Section > AIRCRAFT ARRIVED AT FBO WITH RIGHT ALTERNATOR PROBLEM. REPAIRED RIGHT ALTERNATOR. WHEN AIRCRAFT START ATTEMPTED, LEFT STARTER FOUND TO HAVE SHEARED THROUGH-BOLT. NEW STARTER INSTALLED. AIRCRAFT DEPARTED FBO AND RETURNED ABOUT 30 MINUTES LATER WITH LEFT ENG - [SDR 95ZZZX3205](https://openairdocs.org/sdr/95ZZZX3205.md): Torque Tube · broken · Jun 9, 1995 · N2957Q · Cessna 421A · Landing Gear Retraction/Extension System > PILOT REPORTED NO GREEN ON RT MLG. INSPECTED RT MLG AND FOUND TORQUE TUBE BROKEN AWAY AT PUSH/PULL ROD ATTACH POINT. PUSH/PULL TUBE SEVERED (PN 0840125-15). UPLOCK PUSH/PULL TUBE (PN 0841121-1) WAS BENT. REPLACED ALL PARTS WITH NEW. TOTAL TIME UNKNOWN. H - [SDR 95ZZZX1456](https://openairdocs.org/sdr/95ZZZX1456.md): Starter Adapter · failed · Feb 10, 1995 · N44SC · Cessna 421A · Reciprocating Engine Rear Section > AIRCRAFT LANDED AFTER DARK 2-9-95, WITH THE LEFT ENGINE SHUT DOWN. FOUND STARTER ADAPTER HAD TWO BROKEN TEETH AND METAL THROUGHOUT THE ENGINE. VERY ROUGH AIRCRAFT. ## 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 aircraft_model_key = '421A' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/model/cessna-421a/reports --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.