N275AS

Part: AUDIO PANEL — FAULTY (COCKPIT)

FLT 4916 - ON DESCENT INTO DFW, FIRST OFFICER SMELLED AN ELECTRICAL SMELL FOLLOWED BY VISUALLY SEEING SMOKE COMING FROM HIS COMM PANEL. AN EMERGENCY WAS NOT DECLARED, BUT FIRE TRUCKS WERE REQUESTED. AIRCRAFT LANDED SAFELY IN DFW. AFTER LANDING NO FURTHER SMOKE WAS VISIBLE. UPON INSPECTION MAINTENANCE FOUND THE FIRST OFFICERS AUDIO CONTROL PANEL TO BE HOT AND EMITTING A BURNING SMELL. MAINTENANCE REMOVED AND REPLACED THE FIRST OFFICERS AUDIO CONTROL PANEL. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. (M)

Part: SERVO — BINDING (ELEVATOR)

FLT 4810 - FLT FROM DFW-TUL, THE A/C WAS HARD TO CONTROL. WHEN THE A/P WAS DISCONNECTED, ELEVATOR AND RUDDER WERE HEAVY AS IF THEY WERE STILL CONNECTED TO THE A/P. PULLED THE A/P CIRCUIT BREAKERS, DID NOT FIX PROBLEM. DECLARED EMERGENCY AND A/C LANDED IN TUL W/O INCIDENT. INSP A/C FLT CONTROLS SYSTEMS, FLT CONTROL SURFACES, AND CABLE BELLCRANKS AND FOUND NO DEFECTS. FOUND ELEV TRIM SERVO MOTOR BINDING. REMOVED AND REPLACED ELEVATOR TRIM SERVO MOTOR (P/N 6225734002). RECONNECTED ELEVATOR TRIM CABLES AND TENSIONED. OPERATIONAL CHECK GOOD. AFTER TEST FLT, PILOT REPORTED THAT WITH YAW DAMPER ENGAGED, RUDDER PEDALS WOULD NOT MOVE. MAINTENANCE FOUND RUDDER SERVO MOUNT DEFECTIVE. REMOVED AND REPLACED THE RUDDER SERVO

Part: MOUNT — DEFECTIVE (RUDDER SERVO)

FLT 4810 - DURING FLIGHT, REPORTED THE A/C WAS HARD TO CONTROL. WHEN THE A/P WAS DISCONNECTED, THE ELEV AND RUDDER WERE HEAVY AS IF THEY WERE STILL CONNECTED TO THE A/P. PULLED THE A/P C/B, BUT DID NOT FIX PROBLEM. DECLARED AN EMERGENCY AND A/C LANDED WITHOUT INCIDENT. MX INSP A/C FLT CONTROL SYS, CONTROL SURFACES, AND CABLE BELLCRANKS AND FOUND NO DEFECTS. THE A/P PANEL WAS R&R BY MX AS A PRECAUTIONARY MEASURE. WHILE INSPECTING THE A/P SYS, MX FOUND ELEV TRIM SERVO MOTOR BINDING. MX R&R THE ELEV TRIM SERVO MOTOR. MX R&R THE ELEV TRIM SERVO. OPS CHECK GOOD. AFTER TEST FLT, WITH YAW DAMPER ENGAGED, RUDDER PEDALS WOULD NOT MOVE. INSP, MX FOUND RUDDER SERVO MOUNT DEFECTIVE. MAINTENANCE REMOVED AND REPLACED THE R

Part: SERVO — WORN (ELEVATOR)

FLT 4810 - DURING FLIGHT, REPORTED THAT THE A/C WAS HARD TO CONTROL. WHEN THE AUTOPILOT WAS DISCONNECTED, THE ELEV AND RUDDER WERE HEAVY AS IF THEY WERE STILL CONNECTED TO THE AUTOPILOT. PULLED THE AUTOPILOT CIRCUIT BREAKERS, BUT THIS DIDN`T FIX THE PROBLEM. DECLARED AN EMERGENCY AND A/C LANDED IN TUL WITHOUT INCIDENT. THE TEARDOWN REPORT STATE THERE WERE PROBLEMS WITH THE ELEV TRIM SERVO AS WELL AS THE RUDDER SERVO MOUNT. THE ELEV TRIM SERVO WAS FOUND TO HAVE A WORN CLUTCH WHICH COULD CAUSE THE TRIM SERVO TO ENGAGE AND DISENGAGE IMPROPERLY. THE TEARDOWN ON THE RUDDER SERVO MOUNT FOUND THAT THE CAPSTAN WAS WORN MORE THAN USUAL. BOTH COMPONENTS WILL BE OVERHAULED. (M)

Part: MOUNT — DEFECTIVE (RUDDER SERVO)

FLT 4810 - FLT FROM DFW-TUL, THE A/C WAS HARD TO CONTROL. WHEN THE A/P WAS DISCONNECTED, ELEVATOR AND RUDDER WERE HEAVY AS IF THEY WERE STILL CONNECTED TO THE A/P. CREW PULLED THE A/P CIRCUIT BREAKERS, BUT DID NOT FIX THE PROBLEM. DECLARED AN EMERGENCY AND A/C LANDED IN TUL W/O INCIDENT. WHILE INSP THE A/P SYS, FOUND ELEVATOR TRIM SERVO MOTOR BINDING. REMOVED AND REPLACED THE ELEVATOR TRIM SERVO (P/N 6225734002). OPS CHECK GOOD. AFTER TEST FLT, PILOT REPORTED WITH YAW DAMPER ENGAGED, RUDDER PEDALS WOULD NOT MOVE. UPON INSP, FOUND RUDDER SERVO MOUNT DEFECTIVE. MAINTENANCE REMOVED AND REPLACED THE RUDDER SERVO MOUNT (P/N 6225735004) OPS CHECKS GOOD. (M)

Part: BATTERY PACK — DISCHARGED (CABIN)

DURING C-CHECK INSPECTION, MAINTENANCE DISCOVERED EMERGENCY EXIT TRACK LIGHTING DIM. MAINTENANCE REPLACED EMERGENCY LIGHT BATTERY PACK. SYSTEM OPS CHECKS GOOD. (M)

Part: SEAL — FAILED (CARGO DOOR)

DURING FLIGHT FROM LFT TO MEI, AIRCRAFT EXPERIENCED AN FLIGHT LEVEL 17,000 FEET. PASSENGER OXYGEN MASKS DEPLOYED IN THE CABIN. CAPTAIN DECLARED AN EMERGENCY AND LANDED SAFELY IN MEI. MAINTENANCE REMOVED AND REPLACED THE CARGO DOOR SEAL. OPS AND LEAK CHECKS WERE GOOD. AIRCRAFT RETURNED TO SERVICE. (M)

Part: STRINGER — CRACKED (RT WING)

DURING INSPECTION, FOUND NR 10 RIGHT WING STRINGER CRACKED. MAINTENANCE REPAIRED CRACK FOLLOWING EO 120-57-0103 WHICH OUTLINES PROCEDURES FOR STRINGER 10 CRACK REPAIR. (M)

Part: FUSE — FAILED (CABIN)

DURING INSPECTION, NR 1 EMERGENCY BATTERY PACK FOUND TO BE INOPERATIVE. MCN MAINTENANCE REMOVED AND REPLACED THE FUSE. OPERATIONAL CHECKS WERE GOOD. AIRCRAFT RETURNED TO SERVICE. (M)

Part: BATTERY PACK — DISCHARGED (CABIN)

DURING INSPECTION, NR 1 EMERGENCY BATTERY PACK FOUND TO BE INOPERATIVE. MCN MAINTENANCE REMOVED AND REPLACED THE NR 1 EMERGENCY BATTERY PACK. OPERATIONAL CHECKS WERE GOOD. AIRCRAFT RETURNED TO SERVICE. (M)

Part: FUSE — BLOWN (CABIN)

EMERGENCY LIGHTING FLOOR LIGHTS OUT. MAINTENANCE REMOVED AND REPLACED BLOWN FUSE. OPERATIONAL CHECKS WERE GOOD AND AIRCRAFT IS OK FOR SERVICE. (M)

Part: DRIVE SHAFT — FAILED (LT ENGINE)

EN ROUTE ATL-CRW AT FL230, THE LEFT ENGINE 'ENGINE CONTROL' AND 'OIL PRESSURE' AURAL WARNINGS CAME ON. CREW NOTED THAT THE OIL PRESSURE, NH AND TORQUE ALL READ ZERO, WITH AN OIL PRESSURE LIGHT ON THE MAP. CREW SHUT DOWN THE LEFT ENGINE, DECLARED AN EMERGENCY, ELECTRICALLY FEATHERED THE LEFT ENGINE AND LANDED UNEVENTFULLY AT TRI. ASA MAINTENANCE REMOVED AND REPLACED THE LEFT ENGINE. OPERATIONAL AND LEAK CHECKS WERE GOOD AND THE AIRCRAFT WAS RELEASED FOR FURTHER SERVICE. TEARDOWN REPORT INDICATES THE ACCESSORY DRIVE SHAFT FAILED AT THE UPPER END. THIS LEAD TO THE LOSS OF FUEL PUMP DRIVE AND SUBSEQUENT ENGINE FLAME OUT. (M)

Part: ENGINE — FAILED (LEFT)

FLT 4069 - EN ROUTE ATL-CRW AT FL230, THE LEFT ENGINE 'ENGINE CONTROL' AND 'OIL PRESSURE' AURAL WARNINGS CAME ON. CREW NOTED THAT THE OIL PRESSURE, NH AND TORQUE ALL READ ZERO, WITH AN OIL PRESSURE LIGHT ON THE MAP. CREW SHUT DOWN THE LEFT ENGINE, DECLARED AN EMERGENCY, ELECTRICALLY FEATHERED THE LEFT ENGINE AND LANDED UNEVENTFULLY AT TRI. ASA MAINTENANCE REMOVED AND REPLACED THE LEFT ENGINE. OPERATIONAL AND LEAK CHECKS WERE GOOD AND THE AIRCRAFT WAS RELEASED FOR FURTHER SERVICE. (M)

Part: AILERON CONTL — ROLL RIGHT (LT/RT WINGS)

FLT NR 7259 - OUTBOUND ATL-BQK, CAPTAIN EXPERIENCED A STRONG RIGHT ROLL TENDENCY IN THE AILERONS WITH AUTOPILOT OFF. CREW ELECTED TO RETURN TO ATL AND REQUESTED EQUIPMENT TO MEET THE AIRCRAFT. LANDING WAS MADE SAFELY IN ATL WITHOUT FURTHER INCIDENT. EXTENSIVE TROUBLESHOOTING AND OPERATIONAL CHECKS WERE GOOD, THE PROBLEM COULD NOT BE DUPLICATED. A TEST FLIGHT WAS REQUESTED TO CHECK THE AILERON AND AUTOPILOT SYSTEMS AND WAS COMPLETED SATISFACTORILY. (M)

Part: PRESS REG — DEFECTIVE (LT WING)

MCN/ATL - FLT 7219 - DURING FLIGHT, LEFT ENGINE DUCT LEAK LIGHT ILLUMINATED. THE LEFT ENGINE WAS SHUT DOWN AND SECURED PER POH PROCEDURES, AND THE CREW MADE A SUCCESSFUL SINGLE ENGINE LANDING SAFELY IN ATL. REMOVED AND REPLACED THE LEFT DE-ICE PRESSURE REGULATOR. S/N OFF PE2120, S/N ON RF1842. OPERATIONAL AND LEAK CHECK GOOD IAW/MM. (X)