N763NW

Part: LIGHT — INOPERATIVE (CABIN) · airframe 87,304 hrs · 76,958 cycles

DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROW 6 WAS INOPERATIVE. MAINTENANCE REPLACED THE LIGHT ASSEMBLY AND FUNCTIONALLY CHECKED IT.

Part: BATTERY PACK — INOPERATIVE (EMERGENCY LIGHTS)

DURING LINE CHECK, MX FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROWS 9-12 OF THE CABIN WERE INOPERATIVE. MX REPLACED THE BATTERIES IN THE POWER SUPPLY AND THE LIGHTS RETURNED TO AN OPERATIONAL CONDITION. (K)

Part: BATTERY PACK — INOPERATIVE (EMERGENCY LIGHTS)

DURING LINE CHECK, MX FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROWS 9-11 OF THE CABIN WERE INOPERATIVE. MX REPLACED BATTERIES. OPS CHECK WAS GOOD. (K)

Part: BATTERY PACK — INOPERATIVE (EMERGENCY LIGHT) · airframe 85,348 hrs · 75,284 cycles

DURING LINE CHECK THE AFT LT OVERWING EMERGENCY EXIT SIGN WAS FOUND TO BE INOPERATIVE. MX REPLACED THE BATTERIES. OPS CHECK WAS GOOD.

Part: BATTERY PACK — DISCHARGED (CABIN) · airframe 85,348 hrs · 75,284 cycles

DURING LINE CHECK MX FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROWS 12-15 OF THE CABIN GO OUT AFTER ABOUT 10 SECONDS. MX CHARGED THE BATTERY PACK AND THE LIGHTS RETURNED TO AN OPERATIONAL CONDITION.

Part: BATTERY — INOPERATIVE (EMERGENCY LIGHTS) · airframe 84,547 hrs · 74,543 cycles

DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN THE FIRST CLASS ROWS OF SEATS IN THE CABIN HAD FAILED. MAINTENANCE REPLACED THE BATTERIES. OPERATIONAL CHECK WAS GOOD. (A)

Part: VALVE — LEAKING (HYD SYSTEM) · airframe 82,072 hrs · 72,459 cycles

FLIGHT CREW NOTICED THE RIGHT HYDRAULIC SYSTEM HAD LOST ALL FLUID AND PRESSURE WHILE AT CRUISE. COM PROCEDURES WERE COMPLIED WITH AND VERIFIED SYSTEM INOPERATIVE. THE FLIGHT RETURNED TO A NORMAL SAFE LANDING BACK AT DEPARTURE AIRPORT AND WAS TOWED TO THE GATE. MAINTENANCE AT DTW FOUND THE RT HYDRAULIC SYSTEM VACUUM BREAKER VALVE LEAKING AND REPLACED IT. STANDARD COMPONENT REPLACEMENT DUE TO LOSS OF FLUID ALSO ACCOMPLISHED. FUNCTIONAL CHECKS OF RELATED SYSTEMS, INCLUDING GEAR SWINGS, PERFORMED SATISFACTORILY, LEAK CHECKS WERE ALL GOOD, AND THE AIRCRAFT WAS RETURNED TO SERVICE.

Part: CONTROLLER — MALFUNCTIONED (CABIN PRESSURE) · airframe 81,726 hrs · 72,149 cycles

THE FLIGHT CREW NOTICED THE LOSS OF CABIN PRESSURE WHILE IN CRUISE FLIGHT AND ATTEMPTED TO RECOVER IT WITH MANUAL CONTROL. COM PROCEDURES WERE COMPLIED WITH AND CREW TRIED AUTO CONTROL AGAIN BUT AFTER 2 - 3 MINUTES THE SYSTEM WENT TO FULL CLIMB. AT THAT POINT THE RED "CABIN PRESS" WARNING LIGHT ILLUMINATED AND THE CREW INITIATED A RAPID DESCENT. THE AMBER "CABIN PRESS AUTO FAIL" LIGHT DID NOT ILLUMINATE UNTIL 4000 FEET ON APPROACH. THE PASSENGER MASKS WERE NOT DEPLOYED AND THE LANDING AT MSP WAS UNEVENTFUL. MAINTENANCE REPLACED BOTH CABIN PRESSURE CONTROLLERS AND SOME NAVIGATION INSTRUMENTS. THE AIRCRAFT HAS RETURNED TO SERVICE.

Part: COALESCER BAG — CONTAMINATED (AC SYSTEM) · airframe 79,704 hrs · 70,368 cycles

JUST BEFORE LANDING AN ACRID SMELL WAS NOTICED IN THE AIRCRAFT. THE FLIGHT ATTENDANTS REPORTED THE RT AFT LAVATORY SMOKE DETECTOR WAS SOUNDING. NO VISIBLE SMOKE WAS SEEN AND NO FIRE WAS LOCATED. IT WAS NOTED THAT THE APU WAS NOT OPERATING. AIRCRAFT LANDED NORMALLY AND TAXIED TO THE GATE WITHOUT INCIDENT. MAINTENANCE DID NOT FIND A SOURCE FOR THE FUMES BUT REPORTED THE RT SEPARATOR SOCK AS (CONTAMINATED). NO LEAKS OF ANY TYPE (FLUID OR AIR) COULD BE FOUND. COMPLIED WITH BURNOUT PROCEDURES, REPLACED THE RT COALESCER BAG, AND RETURNED THE AIRCRAFT TO SERVICE.

Part: ODOR — DETECTED (CABIN) · airframe 77,639 hrs · 68,488 cycles

ON APPROACH, FLIGHT ATTENDANT REPORTED BRIEF HOT ELECTRICAL ODOR AROUND ROWS 8-16. NO SMOKE WAS OBSERVED. ALL INDICATIONS WERE NORMAL. FLIGHT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED CEILING AND SIDEWALL AND EMERGENCY LIGHTS. NO TROUBLE FOUND. RAN PACKS WITH NO ODORS OR IRREGULARITIES NOTED. OPERATIONAL CHECK GOOD.

Part: LINE — FAILED (HYD SYSTEM) · airframe 76,208 hrs · 67,178 cycles

AT TOP OF DESCENT, RIGHT HYDRAULIC QUANTITY INDICATED ZERO. A SHORT TIME LATER, THE RIGHT HYDRAULIC PRESSURE LOW LIGHT ILLUMINATED. FOLLOWED COM PROCEDURES AND LANDING GEAR EXTENDED NORMALLY WITHOUT THE USE OF ALTERNATE EXTENSION PROCEDURES. FLIGHT LANDED WITHOUT INCIDENT AT RDU, STOPPED ON THE RUNWAY, AND WAS TOWED TO THE GATE. MAINTENANCE FOUND A HOLE IN THE RIGHT HYDRAULIC PRESSURE RETURN LINE. LINE WAS REPLACED, FILTERS AND PUMP WERE CHECKED, AND SYSTEM WAS RESERVICED. AIRCRAFT RETURNED TO SERVICE.

Part: SMOKE DETECTOR — MALFUNCTIONED (CARGO BAY) · airframe 72,867 hrs · 64,306 cycles

DURING LANDING ROLL, THE MASTER WARNING LIGHT ILLUMINATED ALONG WITH THE FORWARD CARGO FIRE BELL AND CARGO SMOKE WARNING ANNUNCIATOR. COMPLIED WITH COM PROCEDURES BUT THE WARNING INDICATIONS REMAINED. CREW DISCHARGED THE CARGO FIRE SUPPRESSION AGENT PER COM. LANDING WAS WITHOUT FURTHER INCIDENT AND THE FIRE INDICATIONS STAYED UNTIL ARRIVAL AT THE GATE. CFR RESPONDED AND CLEARED THE CARGO HOLD. NO SIGNS OF FIRE OR SMOKE FOUND. MAINTENANCE REPLACED THE CARGO SMOKE DETECTORS AND THE NR 1 CARGO FIRE BOTTLE. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.

Part: SMOKE DETECTOR — MALFUNCTIONED (CARGO BAY) · airframe 68,738 hrs · 60,868 cycles

CLIMBING OUT OF BNA, CREW HAD FORWARD CARGO SMOKE INDICATION. FOLLOWED COM PROCEDURE, DISCHARGED FIRE BOTTLE, BUT WAS UNABLE TO EXTINGUISH WARNING LIGHT. FLIGHT RETURNED TO BNA AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE FIRE BOTTLE AND PERFORMED A SYSTEM SELF-TEST ON THE CARGO SMOKE DETECTION/FIRE SUPPRESSION SYSTEM. OPERAITONAL CHECK OK. AIRCRAFT RETURNED TO SERVICE.

Part: BATTERY — DISCHARGED (TAIL CONE)

DURING LINE CHECK, FOUND AFT STAIRWAY AND TAIL CONE EMERGENCY LIGHTING INOPERATIVE. MAINTENANCE REPLACED BATTERIES, OPERATIONAL CHECK NORMAL.

Part: OUTFLOW VALVE — MALFUNCTIONED (CABIN)

LOSS OF CABIN PRESSURIZATION OCCURRED DURING CRUISE FLIGHT AT 29,000 FEET. CABIN ALTITUDE ROSE TO 17,000 FEET AND OXYGEN MASKS WERE DEPLOYED THROUGHOUT THE CABIN. CREW EXECUTED EMERGENCY DESCENT TO 11,000 FEET. FLIGHT WAS DIVERTED TO CRW AND LANDED WITHOUT INCIDENT. AIRCRAFT WAS FERRIED TO ATL FOR REPAIRS. MAINTENANCE REPLACED CABIN PRESSURE AMPLIFIER, OUTFLOW VALVE, AND RADIO RACK VENTURI VALVE. OPERATIONAL CHECK NORMAL.

Part: FUEL CONTROL — MALFUNCTIONED (LT ENGINE)

DURING CLIMB TO MAINTAIN EQUAL POWER SETTINGS, THE POWER LEVERS WERE SPLIT WITH THE LEFT FORWARD OF THE RIGHT. CREW ELECTED TO RETURN TO DTW. MAINTENANCE REPLACED THE LEFT ENGINE FUEL CONTROL UNIT. ENGINE OPERATIONAL CHECK OK.

Part: POWER SUPPLY — INOPERATIVE (CABIN)

DURING LINE CHECK, FOUND FORWARD OVERWING EMERGENCY LIGHTS INOPERATIVE. MAINTENANCE REPLACED POWER SUPPLY. OPERATIONAL CHECK OK.

Part: CLIPS — OUT OF ADJUST (TAIL CONE)

DURING TAIL CONE FUNCTIONAL CHECK, FOUND THAT INADEQUATE FORCE WAS REQUIRED TO PULL THE EXTERIOR RELEASE HANDLE FROM THE RETAINING CLIPS. ALSO, FOUND THAT 6 ALIGNMENT PINS BOTTOM OUT. SHIMMED ALIGNMENT PINS AND ADJUSTED CLIPS, FUNCTIONAL CHECK OK.

Part: RELEASE MECH — OUT OF ADJUST (TAIL CONE)

DURING TAILCONE FUNCTIONAL CHECK, FOUND THE TAIL CONE DID NOT DROP AND EXCESSIVE FORCE WAS REQUIRED TO REMOVE HANDLE FROM CLIPS. ALSO, FOUND THE UPPER TWO GUIDE PIN BEARING PLATES ON THE TAIL CONE WORN AND NIINE GUIDE PINS WORN. CLEANED SEAL, REPLACED BEARING PLATES AND GUIDE PINS, AND ADJUSTED CLIPS, OPERATIONAL CHECK OK.

Part: OUT FLOW VALVE — FAILED (CABIN)

AFTER TAKEOFF, THE AIRCRAFT WOULD NOT PRESSURIZE. FOLLOWED COCKPIT OPERATING MANUAL PROCEDURE. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. REPLACED OUTFLOW VALVE ACTUATOR, OPERATIONAL CHECK OK.

Part: BATTERY PACK — DISCHARGED (CABIN)

DURING LINE CHECK, FOUND MID SECTION EMERGENCY LIGHTS BY EMERGENCY EXIT DOORS INOPERATIVE. REPLACED 05-903 BATTERY PACK AND CHARGER. OPERATION CHECKS GOOD.

Part: HIGH TEMP SENSOR — MALFUNCTIONED (LEFT)

AFTER TAKEOFF POWER WAS APPLIED, THE LEFT ICE PROTECTION TEMPERATURE HIGH LIGHT ILLUMINATED. NO ICE PROTECTION WAS SELECTED ON. LIGHT REMAINED ON UNTIL HIGH PRESSURE BLEED SWITCH WAS TURNED OFF. REPLACED THE HIGH TEMPERATURE SENSOR, OPERATIONAL CHECK OK.

Part: ANNUNCIATOR MOD — FAILED (COCKPIT)

ON APPROACH, NOSE GEAR LIGHT FAILED TO ILLUMINATE THE FIRST TWO TIMES GEAR WAS LOWERED. ON THE THIRD ATTEMPT, ALL INDICATIONS WERE NORMAL. PROBLEM FOUND TO BE IN NOSE GEAR ANNUNCIATOR MODULE. CLEANED ANUNCIATOR, CHANGED BULB, AND SWUNG GEAR TEN TIMES. ALL GEAR POSITION INDICATIONS CHECK GOOD.

Part: VERTICAL GYRO — FAILED (E/E COMPT)

DURING CRUISE, WEATHER RADAR BECAME INOPERATIVE. DUE TO EN ROUTE WEATHER, FLIGHT DIVERTED TO ATL AND LANDED WITHOUT INCIDENT. REPLACED NR 1 VERTICAL GYRO, OPERATIONAL CHECK OK.

Part: FRAME — CORRODED (FS 1072)

DURING H-CHECK, FOUND CORROSION ON THE FS 1072 FRAME AT THE LEFT CUSP ANGLE. REPAIRED FRAME (P/N 5910163-73) PER EA 97-108880.

Part: FITTING — CORRODED (FS 1056)

DURING H-CHECK, FOUND CORROSION ON THE FS 1056 FLOOR BEAM END FITTING AT THE LEFT CUSP. REPLACED FITTING PER SRM 51-30-5.

Part: FITTING — CRACKED (CARGO DOOR)

DURING H-CHECK, FOUND A CRACK IN THE AFT CARGO DOOR NR 4 BEAM AFT END FITTING. REPLACED FITTING.

Part: FITTING — CRACKED (SERVICE DOOR)

DURING H-CHECK, FOUND A CRACK IN THE FORWARD SERVICE DOOR END FITTING AT THE LOWER FORWARD HINGE. REPLACED FITTING PER SRM 51-30-5.

Part: FITTING — CRACKED (CARGO DOOR)

DURING "H" CHECK, FOUND A CRACK IN THE AFT CARGO DOOR NR 1 BEAM FORWARD END FITTING. REPLACED FITTING PER SRM 51-30-5.

Part: BATTERY PACK — DISCHARGED (CABIN)

DURING LINE CHECK, FOUND ONE SECTION OF EMERGENCY LIGHTS INOPERATIVE AT SECTION 886. REPLACED BATTERY PACK AND OPERATIONAL CHECK GOOD.

Part: RADAR SYST — MALFUNCTIONED (FWD FUSELAGE)

WEATHER RADAR WOULD NOT PAINT GROUND RETURNS AND BEGAN SPOKING AFTER TAKEOFF. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED RADAR TRANSCEIVER AND INDICATOR WITH NO HELP. DEFERRED RADAR SYSTEM PER MEL 34-19 AND AIRCRAFT RETURNED TO SERVICE.

Part: DOOR SWITCH — FAILED (LT MLG)

DURING CLIMB, LANDING GEAR DOOR OPEN LIGHT REMAINED ILLUMINATED AFTER LANDING GEAR RETRACTION. RECYCLED LANDING GEAR AND LIGHT REMAINED ILLUMINATED. AIRCRAFT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED LEFT MAIN LANDING GEAR DOOR WARNING SWITCH AND OPERATIONAL CHECK GOOD.

Part: SKIN — CRACKED (LT/RT TE FLAP)

DURING LINE CHECK, FOUND CRACKS IN THE LEFT AND RIGHT FLAP TRAILING EDGES. REPAIRED FLAPS PER EA 98-104972, -104973 RESPECTIVELY.