J-3Cub

Parts most often named Coil (1) · Wire (1) · Gear (1)

DURING TAKE-OFF THE ENGINE QUIT. THE AIRCRAFT WAS DESTROYED. INVESTIGATION BY THE FAA INSPECTOR PROVED THAT THE PROBABLE CAUSE OF THE ENGINE FAILURE WAS ATTRIBUTED TO BOTH MAGNETO P-LEAD WIRES BEING GROUNDED OUT AGAINST A SCREW THAT SECURED THE LEFT-HAND INNER AND OUTER WINDOW TRIM PIECES.

WHILE DETERMINING C/W TELEDYNE AD 94-01-03R2, FOUND RIGHT MAGNETO TO HAVE AN UNAIRWORTHY COIL. UPON REMOVAL, COIL WAS FOUND CRACKED IN TWO PLACES ORIGINATING FROM THE CORE ON THE GROUND LEAD END. LOG ENTRY OF 2-20-88 INDICATES THIS MAGNETO COIL WAS CHANGED TO THE 'NEW STYLE', BUT DID NOT GIVE A PART NUMBER.

Parts most often named Fittings (2)

DURING A ROUTINE INSPECTION, FOUND CRACK ON THE BASE OF THE MOUNTING LUG ON THE AFT RT WING STRUT/GEAR ATTACH FITTING, PN 20401-01. AFTER PEELING OFF THE REMAINING DOPE FINISH ON THE FITTING, DISCOVERED A SECOND CRACK. AT LT FITTING, PN 20401-00, AND AFTER SCRAPING OFF THE DOPE FINISH, DISCOVERED TWO MORE CRACKS. POSSIBLE CAUSE, PREVIOUS AIRCRAFT DAMAGE. SUBMITTER RECOMMENDED PAINTING FITTINGS, NOT COVER THEM UP WITH DOPE FINISH.

Parts most often named Cable Assy (1) · Tab (1)

WITH RUDDER PEDAL IN NEUTRAL POSITION, RUDDER WAS AT ALMOST FULL LEFT DEFLECTION. UPON INVESTIGATION, FOUND THAT RUDDER CABLES HAD BEEN REPLACED AND WERE OF DIFFERENT LENGTHS. SUBMITTER STATED FAILURE TO FOLLOW AIRWORTHY PRACTICES WAS THE OBVIOUS CAUSE. REPLACED CABLES WITH CURRENT PART NUMBERS AND RIGGED SYSTEM.

Parts most often named Spar (2)

SEVERE CORROSION ON LT AND RT AILERON MAIN SPARS BETWEEN SPAR AND BRACKETS. SPAR BULGES AROUND RIVETS ATTACHING THE BRACKETS TO THE SPAR. THIS CONDITION WAS FOUND WHEN INSPECTING AILERONS PRIOR TO RECOVERING. SUSPECT THEY MAY HAVE BEEN ON SEA PLANE OPERATED ON SALT WATER.

DURING REMOVAL OF LT WING FOR INSTALLATION OF WING FUEL TANK, A QUESTIONABLE PREVIOUS REPAIR WAS FOUND AT THE FRONT WOOD SPAR ROOT. FURTHER INVESTIGATION FOUND LONGNATUDINAL CRACKS OF THE LT AND RT, FOR AND AFT WOOD WING SPARS. THESE CRACKS WERE VISIBLE WITH A BARE EYE WHEN THE FRONT SPAR CARRY ATTACH INSPECTION PANEL WAS REMOVED AND INSPECTED FROM THE FRONT CABIN AREA. CRACKS ARE NOT UNCOMMON AFTER 60 YEARS OF HARD [S/N removed] AND NATURAL DEGRADATION OF THE WOOD. (K)

Parts most often named Axle (1) · Strut (1)

ACFT WAS FLOWN FOR 45 HRS ON SNOW SKIES BEFORE THE RT SHOCK STRUT BROKE AT LOW SPEED TAXI. THE RT LONG SHOCK STRUT BROKE HALF WAY DOWN THE TUBE WITH NO SIGNS OF PREVIOUS CRACKING. BRAKE OCCURRED DURING COMPRESSION OF THE SHOCK STRUT DUE TO HIGH SIDE LOADS FROM HEAVY SNOW AND ICE.

Parts most often named Cylinder (1) · Plug (1)

DURING A 100 HR INSPECTION COMPRESSION TEST FOUND NR 1 CYLINDER CRACKED FROM BEHIND FIRST FIN TO SPARK PLUG HOLE (UPPER) ABOVE EXHAUST PORT. REPLACED WITH NEW CYLINDER ASSY.

FOLLOWING MAJOR OVERHAUL, ALUM PARTICLES WERE FOUND IN THE OIL SCREEN AT 30, 55, AND 75 HOURS. CYLINDERS WERE REMOVED AND THE PISTON PIN PLUGS WERE FOUND WORN ON THE SHANK IN THE FORM OF A TAPER. THE PINS AND PLUGS WERE NEW AND CAME FROM A SET. THE OVERHAUL MANUAL CALLS FOR THESE TO BE A .0005 INCH TO .0025 INCH TIGHT FIT, BUT THE [S/N removed] LIMIT IS .003 INCH LOOSE AND PLUGS HAVE ALWAYS SLID IN AND OUT. SUBMITTER STATED THEIR FIX WAS TO GET PLUGS WITH A .0025 INCH FIT. (X)

Parts most often named Hinge Bracket (1) · Bracket (1)

(CAN) ON ACCOMPLISHING ANNUAL INSPECTION, FOUND DIS-COLOURED SPOT ON BOTTOM OF HINGE BRACKET PIVOT. ON APPLYING "MAULE TESTER" FOR STRENGTH TEST. TUBE COLLAPSED. INSPECTION FOUND THE SUPPORT TUBE WAS NOT DRILLED FOR DRAINAGE. THE NEW REPLACEMENT BRACKET WAS RECEIVED WITH A MFG DRILLED DRAINAGE HOLE. CHECKING THE REMAINING HINGES FOUND NO CORRODED TUBES. IT WAS NOTED THAT 3 HINGES WERE NOT DRILLED FOR DRAINAGE. DRAIN HOLES ADDED TO THIS BRACKETS.

Parts most often named Connecting Rod (1) · Housing (1)

DUE TO A "STUCK" EXHAUST VALVE IN 1 CYLINDER, THE ROCKER ARM BROKE, AND THE PUSHROD ASSOCIATED WITH THAT ROCKER ARM DAMAGED AND CRACKED THE FLANGE-PUSHROD HOUSING. THE CRACKED FLANGE-PUSHROD HOUSING CREATED AN OIL LEAK. THE "STUCK" EXHAUST VALVE WAS CAUSED BY THE HIGH LEAD LEVEL OF THE AV-GAS 100LL.

Parts most often named Engine (1)

ENGINE POWER FAILURE DURING TAKEOFF. MAINTENANCE INVESTIGATION AND POST-ENGINE RUN WAS CONDUCTED. ENGINE RAN SATISFACTORY. MAINTENANCE ADVISED, SUSPECT FUEL STARVATION DUE TO FREEZING OF WATER CONTAMINATION IN LOW SECTION OF FUEL LINE.

Parts most often named Muffler (1)