# Service difficulty reports: Cessna 401B A list on [Cessna 401B](https://openairdocs.org/model/cessna-401b.md). Newest first. General aviation reporting is voluntary. - [SDR CA140328005](https://openairdocs.org/sdr/CA140328005.md): Pump · leaking · Mar 28, 2014 · Cessna 401B · Fuel Boost Pump > (CAN) DURNING AN INSPECTION, FUEL WAS SEEN UNDER THE RT WING LANDING LIGHT. THE WING TIP TANK END COVER WAS REMOVED AND THE FUEL WAS SEEN COMING OUT OF THE TIP TANK AFT FUEL PUMP. FUEL WAS DRIPING ON TOP OF THE LANDING GEAR RETRACTION MOTOR. THE FUEL PUMP W - [SDR CA131209002](https://openairdocs.org/sdr/CA131209002.md): Capacitor · burned · Nov 29, 2013 · Cessna 401B · Communications System Wiring > (CAN) PILOTS REPORTED BURNING ODOR IN THE COCKPIT AND THE LOSS OF 1 RADIO. THE ACFT LANDED WITHOUT INCIDENT OR IMPACT ON OPERATIONS. MAINTENANCE DISCOVERED THE SOURCE OF THE BURNING ODOR WAS FROM THE NR 1 COMM. THE NR 1 COMM WAS SENT TO A REPAIR BS FOR A TE - [SDR CA130523002](https://openairdocs.org/sdr/CA130523002.md): Sprocket · broken · May 21, 2013 · Cessna 401B · Trailing Flap Position Indicating System > (CAN) DURING THE ACFT RUNUP, THE PILOT SELECTED FLAPS DOWN. AT 30 DEGREE OF FLAP DOWN POSITION, A NOISE WAS HEARD AND THE FLAPS STOPPED. THE ACFT TAXIED BACK TO THE RAMP. AFTER INSPECTION, THE RT CONTROL SPROCKET, PN 0861500-71 ON THE FLAP ACTUATOR WAS FOUN - [SDR 2012FA0000276](https://openairdocs.org/sdr/2012FA0000276.md): Landing Gear · collapsed · Mar 8, 2012 · N44349 · Cessna 401B · Nose/Tail Landing Gear > ACFT LANDED & NLG COLLAPSED. NLG REPORTED TO HAVE BEEN OPERATED FOR A PERIOD OF TIME WITH A DEFLATED NOSE STRUT. STRUT SERVICED, ALSO REPORTED NLG HAD BEEN SUBJECT TO ROUGH OPERATION, OPERATED IN & OUT OF A GRASS AIRSTRIPS. NLG EXTENDED & RETRACTED USING E - [SDR CA100824003](https://openairdocs.org/sdr/CA100824003.md): Chain · broken · Aug 20, 2010 · Cessna 401B · Trailing Edge Flap Actuator > WHILE ON SHORT FINAL, AFTER FULL FLAPS HAD BEED SELECTED A LARGE BANG WAS HEARD. AIRPLANE ROLLED HARD TO THE RT. THE ALTITUDE WAS AT 200 FT. INPUT OPPOSITE AILERON TO BRING THE LOW WING UP. FLAPS WERE THEN SELECTED TO THE UP POSITION BUT NO CHANGE. ABORTED - [SDR CA090807004](https://openairdocs.org/sdr/CA090807004.md): Support Bracket · broken · Jul 8, 2009 · Cessna 401B · Exhaust Turbocharger > RT TURBO SUPPORT BRACKET FOUND BROKEN DURING INSP. - [SDR CA090520003](https://openairdocs.org/sdr/CA090520003.md): Crankcase · cracked · May 20, 2009 · Cessna 401B · Reciprocating Engine Power Section > (CAN) AN OIL LEAK WAS NOTED ON THE LT ENGINE. A CRACK WAS FOUND IN THE RT CRANKCASE HALF. THE CRACK WAS LOCATED AFT OF THE ALTERNATOR, FWD OF THE NR 5 CYL, 7TH STUD. THE ENGINE WAS REMOVED FOR REPAIR. - [SDR CA080328007](https://openairdocs.org/sdr/CA080328007.md): Arm · broken · Mar 27, 2008 · Cessna 401B · Landing Gear Doors > DURING PILOT WALKAROUND THE RT MAIN GEAR DOOR WAS HANGING SLIGHTLY DOWN FROM RETRACTED POSITION. MAINTENANCE TO REPLACE PART. (TC NR 20080328007) - [SDR CA070125002](https://openairdocs.org/sdr/CA070125002.md): Screw · broken · Jan 24, 2007 · Cessna 401B · Landing Gear Door Retract Section > (CAN) UPON LANDING RT MLG INADVETENTLY RETRACTED. AIRCRAFT VEERED OFF RUNWAY. AIRCRAFT INSPECTED AND CAUSE DEEMED FAILURE OF RT MLG ADJUSTING SCREW CAUSING SIDE BRACE ASSY TO UNLOCK. (TC NR 20070125002) - [SDR 2006FA0000682](https://openairdocs.org/sdr/2006FA0000682.md): Crankcase · cracked · Jul 17, 2006 · N7916Q · Cessna 401B · Reciprocating Engine Power Section > FOUND A CRACK IN BOTH CASE HALF AT THE FOURTH AFT BOLT HOLE FROM FRONT OF CASE AT 12 O'CLOCK POSITION. CRACKS WERE FOUND ON AN INSPECTION OF ENGINE. - [SDR 2006FA0000683](https://openairdocs.org/sdr/2006FA0000683.md): Crankcase · cracked · Jul 17, 2006 · N7916Q · Cessna 401B · Reciprocating Engine Power Section > FOUND A CRACK IN BOTH CASE HALVES AT THE FOURTH AFT BOLT HOLE FROM FRONT OF CASE AT 12 O'CLOCK POSITION. CRACKS WAS FOUND ON AN INSPECTION OF ENGINE. - [SDR CA060510011](https://openairdocs.org/sdr/CA060510011.md): Trunnion · cracked · May 2, 2006 · Cessna 401B · Main Landing Gear Strut/Axle/Truck > THE RT MAIN LANDING GEAR OLEO WENT FLAT AFTER LANDING. A CRACK WAS NOTICED ON THE UPPER TRUNNION, JUST UNDER THE SIDE BRACE ATTACH FITTING. THE UPPER TRUNNION WAS REPLACED. - [SDR CA041025001](https://openairdocs.org/sdr/CA041025001.md): Bellcrank · unserviceable · Oct 20, 2004 · Cessna 401B · Landing Gear Door Retract Section > (CAN) LANDING GEAR IDLER BELCRANK PN 0541106-6 ON NR 2 MAIN LANDING GEAR, GEAR DOOR CONTROL LOBE FOUND SEVERED RESULTING IN GEAR DOOR HANGING DOWN. UPON INSPECTION OF RT LANDING GEAR SYSTEM FOUND A CRACKED WELD ON THE NR 2 TORQUE TUBE ASSEMBLY RESULTING FROM B - [SDR CA040621011](https://openairdocs.org/sdr/CA040621011.md): Actuator · worn · Jun 17, 2004 · Cessna 401B · Trailing Edge Flap Actuator > ON APPROACH, THE FLAPS WERE LOWERED TO 45 DEG BUT ONLY WENT TO 30 DEG. THE AIRCRAFT LANDED SAFELY. THE FLAP ACTUATOR INTERNAL GEARS WERE FOUND STRIPPED. THE ACTUATOR WAS REPLACED WITH AN OVERHAULED UNIT. - [SDR CA040616011](https://openairdocs.org/sdr/CA040616011.md): Door · separated · May 19, 2004 · Cessna 401B · Emergency Exits > AFTER TAKEOFF A GROWING WHISTLING SOUND DEVELOPED IN INTENSITY OVER PILOTS LEFT SHOULDER. THERE WAS A LOUD POP OF A NOISE AND THE PILOT SAW THE STARBOARD EMERGENCY EXIT SELF EJECT OUT AND BACK FROM THE REST OF THE PLANE. AIRSPEED WAS REDUCED 170 MPH. PLANE - [SDR CA030826003](https://openairdocs.org/sdr/CA030826003.md): Plate · cracked · Aug 8, 2003 · Cessna 401B · Fuel Storage > (CAN) DURING A NR 3 INSPECTION, A FUEL STAIN WAS NOTICED AROUND THE RT NAVIGATION LIGHTCOVER. THE COVER WAS REMOVED AND A CRACK WAS FOUND ON THE FORWARD FUEL TANK PLATE. THE CRACK WAS UNDER THE LOWER STROBE LIGHT BRACKET, CAUSING FUEL TO LEAK INTO THE STROBE L - [SDR CA011030005](https://openairdocs.org/sdr/CA011030005.md): Bracket · cracked · Oct 9, 2001 · Cessna 401B · Wing, Landing Gear Attach Fittings > (CAN) DURING RETRACTION OF GEAR AFTER TAKEOFF PILOT HEARD A BANG. UPON LANDING AT BASE THE AIRCRAFT WAS INSPECTED AND THE RT FORWARD GEAR DOOR HINGE BRACKET WAS FOUND TO BE CRACKED. - [SDR CA011003015](https://openairdocs.org/sdr/CA011003015.md): Spacer · wrong part · Sep 16, 2001 · Cessna 401B · Engine Mount Section > (CAN) WHILE INSTALLING NEW ENGINE NOTICED THAT ENGINE ATTACH BOLTS WERE TOO SHORT. PART NR OF BOLTS WERE CORRECT. ENGINE MOUNTS WERE FOUND TO BE PROBLEM. SPACERS IN ENGINE MOUNT KITS WERE WRONG LENGTH & WRONG PART NR. - [SDR CA010507010](https://openairdocs.org/sdr/CA010507010.md): Terminal · loose · Apr 16, 2001 · Cessna 401B · Landing Gear Selector > (CAN) WHEN GEAR WAS SELECTED UP AFTER TAKEOFF IF DID NOT RETRACT. UNTIL THE PILOT HAD TURNED FOR RETURN TO RUNWAY. SUBSEQUENT INVESTIGATION REVEALED LOOSE WIRING TERMINALS ON GEAR SELECTOR HANDLE. - [SDR CA001205021](https://openairdocs.org/sdr/CA001205021.md): Gear · cracked · Nov 16, 2000 · Cessna 401B · Trailing Edge Flap Control System > (CAN) - IN FLIGHT, FLAPS SELECTED, FLAPS DID NOT RESPOND. ON GROUND CHECKED ELECTRICAL CONNECTIONS & TESTED. FOUND THAT THE FLAPS EXTENDED, BUT WOULD NOT RETRACT FULLY. ISOLATED PROBLEM TO STRIPPED REDUCTION GEAR BOX AS FLAPS COULD BE HELD IN POSITION BY HAN - [SDR CA990224010](https://openairdocs.org/sdr/CA990224010.md): Resistor · burnt · Jan 28, 1999 · Cessna 401B · Flight Compartment Lighting > (CAN) IN CRUISE, A SMALL AMOUNT OF SMOKE NOTICED FOLLOWED BY BURNT SMELL. SMOKE COMING FROM CENTER INSTRUMENT PANEL. SMOKE QUIT AND ALL SYSTEMS SEEMED OK. ON GROUND, FOUND THE COPILOT'S POST LIGHTS NOT WORKING. RESISTOR MOUNTED ON THE BACK OF CIRCUIT RHEO - [SDR AU981172](https://openairdocs.org/sdr/AU981172.md): Window · separated · Aug 16, 1998 · Cessna 401B · Emergency Exits > (AUS) EMERGENCY EXIT WINDOW SEPARATED FROM THE AIRCRAFT. WINDOW HAD BEEN REMOVED AND RE-FITTED DURING AN EXTENDED 100-HOUR INSPECTION THAT HAD TAKEN SEVERAL MONTHS. AT SOME TIME BETWEEN THE FITTING OF THE WINDOW AND THE WINDOW SEPARATION, THE EMERGENCY EXIT - [SDR 96ZZZX1524](https://openairdocs.org/sdr/96ZZZX1524.md): Oil Filter · leaking · Mar 1, 1996 · N401GB · Cessna 401B · Reciprocating Engine Oil System > WHILE AIRCRAFT IN-FLIGHT, PILOT REPORTED OIL LEAKING FROM LEFT ENGINE. DURING INSPECTION OF LEFT ENGINE, FOUND OIL FILTER AND SURROUNDING AREA OIL SOAKED. AFTER CLEANING AND RUNNING ENGINE FOUND OIL LEAKING FROM HEXHEAD OF OIL FILTER (CH48108). REMOVED FILT - [SDR 95ZZZX4190](https://openairdocs.org/sdr/95ZZZX4190.md): Hub · cracked · Apr 12, 1995 · Cessna 401B · Propeller Hub Section > UPON INSPECTION, HUB FOUND CRACKED IN BLADE SOCKET NR 2. HUB HAS BEEN SCRAPPED. - [SDR 95ZZZX2415](https://openairdocs.org/sdr/95ZZZX2415.md): Servo · jammed · Feb 15, 1995 · N3013Q · Cessna 401B · Autopilot Main Servo > PITCH CONTROLS JAMMED. UPON INSPECTION, FOUND PITCH SERVO BRIDLE CABLE RETAINING BALL HAD SLIPPED OUT OF SLOT AND JAMMED AGAINST CABLE GUARD POST AND CAPSTAN. REMOVED SERVO AND NO DAMAGE EVIDENT, HOWEVER, WAS UNABLE TO TIGHTEN SET SCREW TIGHT ENOUGH TO RETAI ## 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 = '401B' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/model/cessna-401b/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.