MCCALL AVIATION, INC.

Operated by McCall Aviation Inc. (per NTSB report)

Operated by MCCALL AVIATION INC (per NTSB report)

Operated by McCall Aviation Inc. (per NTSB report)

ACFT STARTED AND RUNNING FOR A TRAINING FLIGHT, PILOTS NOTICED A VIBRATION OF THE ENGINE AND NO CYLINDER HEAD TEMP OR EXHAUST TEMP ON NR 6 CYLINDER IAW THE ENGINE MONITOR. PILOTS SHUT ENGINE DOWN AND NOTIFIED MAINTENANCE. AFTER INSPECTION OF CYLINDER NR 6, BY USE OF A BORSCOPE FOUND EXHAUST VALVE WAS MISSING A PORTION OF THE VALVE. REMOVED THE CYLINDER AND FOUND IT CRACKED FROM THE LOWER SPARK PLUG BOSS TO THE EXHAUST PORT, DAMAGE TO INNER CYLINDER HEAD MISSING MATERIAL AND MISSING PORTION OF EXHAUST VALVE.

PILOT HAD DEPARTED AND SHORTLY AFTER TAKEOFF EXPERIENCED SMOKE IN THE CABIN. LANDED. INSTALLED NEW EXHAUST TAILPIPE ASSEMBLY V-BAND CLAMP.

SHORTLY AFTER TAKEOFF, EXPERIENCED SMOKE IN THE CABIN. LANDED. INSTALLED NEW EXHAUST TAILPIPE ASSEMBLY V-BAND CLAMP, WHICH HAD BROKEN.

AFTER LANDING, DURING ROLLOUT, NLG COLLAPSED CAUSING PROPELLER TO STRIKE THE RUNWAY. GEAR LIGHS INDICATED "GEAR DOWN" AND VISUAL INSPECTION PRIOR TO LANDING CONFIRMED GEAR DOWN. (K)

THIS PART HAS 2 SMALL 90 DEGREE ANGLES AT EITHER SIDE BOTTOM. THEY HAVE LITTLE OR NO ACTUAL STRENGTH OTHER THAN TO PREVENT THE LOWER WING SKIN FROM NOT BEING SECURED. RT AILERON OTBD HINGE BRACKET. (K)

THIS PART HAD 1 OR 2, 90 DEGREE ANGLES ON THE BOTTOM SIDE, CRACKED. THIS WAS CAUSED MOST LIKELY FROM YEARS OF FATIGUE. DON`T THINK THIS WOULD HAVE CAUSED AN AIRWORTHINESS CONCERN AS IT DOES NOT APPEAR TO HAVE WEAKENED THE ATTACHMENT OF THE HINGE BRACKET. THIS TYPE OF FAILURE IS TO BE EXPECTED WHEN AN ACFT OF THIS TYPE HAS THIS MANY HOURS (12,000 HRS) OF OPERATION IN THE BACK COUNTRY STRIPS IT OPERATES ON DAILY. THIS TYPE OF ACFT SHOULD BE GROUNDED WHEN THEY HAVE 10,000 HRS OR MORE DUE TO THE METAL FATIGUE. (K)

LOWER SUPPORTING ANGLE CRACKED FROM MANY YEARS AND HOURS OF FATIGUE. THIS ACFT HAS BEEN OPERATED ON UNIMPROVED BACK COUNTRY DIRT LANDING STRIPS WHICH POUND AND SHAKE THESE ACFT EXTREMELY. THIS TYPE OF PART FAILURE IS TO BE EXPECTED UNDER THE CONDITIONS THIS ACFT HAS BEEN SUBJECTED TO. THIS WAS NOT A FAILURE WHICH WOULD CAUSE A CONTROL LOSS AIRWORTHINESS. (K)

DURING AN ENGINE START, THE STARTER BENDIX DRIVE GEAR BROKE. THIS IN TURN LOCKED THE RING GEAR WHICH LOCKS PROP AND ENGINE. (K)

RT ENGINE STARTER DRIVE GEAR SHAFT WAS DAMAGED TO THE EXTENT, THAT THE BENDIX COULD NOT RETRACT FROM THE ENGAGED POSITION. THUS CAUSING THE GEAR TO REMAIN ENGAGED AFTER START. THIS IN TURN BROKE THE DRIVE GEAR TEETH. THE BROKEN TOOTH THEN LOCKED UP THE RING GEAR CAUSING THE CRANKSHAFT TO STOP ROTATION. THIS CAUSED AN ENGINE FAILURE.

BENDIX DRIVE GEAR OF RT ENGINE BROKE LOCKING RING GEAR OF CRANKSHAFT LOCKING ENGINE TO A STOP CONDITION. (K)

THIS IS A RESULT OF HARD USE FOR MANY YEAR IN BACK COUNTRY. THE CRACKS WERE FOUND AT A PHASE II INSPECTION. THESE PARTS HAVE SERVED THEIR USEFUL LIFE AND SHOULD BE CHANGED WITH THIS MUCH TIME AND HARD USE. LANDING GEAR FITTINGS, LT AND RT, OB. (NM11200403612) (K)