N1799U

Part: BATTERY PACK — DISCHARGED (CABIN) · airframe 87,684 hrs · 95,908 cycles

DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING FOR THE CATWALK IN THE TAIL COMPARTMENT WAS INOPERATIVE. MAINTENANCE REPLACED THE BATTERY PACK AND THE LIGHTS RETURNED TO AN OPERATIONAL CONDITION.

Part: LIGHT — INOPERATIVE (EXTERIOR) · airframe 87,621 hrs · 95,867 cycles

DURING PREFLIGHT CHECK THE FLIGHT CREW FOUND THAT THE LEFT SIDE EXTERIOR EMERGENCY FLOOD LIGHT WAS INOPERATIVE. MAINTENANCE REPLACED THE LIGHT ASSEMBLY AND PERFORMED A SATISFACTORY FUNCTIONAL CHECK.

Part: BATTERY PACK — MALFUNCTIONED (EMERGENCY LIGHTS) · airframe 87,556 hrs · 95,806 cycles

DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROWS 8-10 AND THE LEFT OVERWING EMERGENCY EXIT SIGN AT ROW 11 WERE SHOWING INTERMITTENT OPERATION. MAINTENANCE REPLACED THE BATTERY PACK AND THE LIGHTS RETURNED TO AN OPERATIONAL CONDITION.

Part: BATTERY — DISCHARGED (CABIN) · airframe 87,509 hrs · 95,772 cycles

DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROWS 18-21 OF THE CABIN WERE INOPERATIVE. MAINTENANCE REPLACED THE BATTERIES. OPERATIONAL CHECK WAS GOOD.

Part: BATTERY PACK — INOPERATIVE (EMERGENCY LIGHTS) · airframe 84,429 hrs · 93,313 cycles

DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN THE VENTRAL STAIRWAY WAS INOPERATIVE. MAINTENANCE REPLACED THE POWER PACK AND OPERATIONALLY CHECKED THE SYSTEM. THE AIRCRAFT HAS RETURNED TO SERVICE.

Part: SKIN — CORRODED (FUSELAGE) · corrosion level 2 · airframe 83,287 hrs · 92,420 cycles

DURING "H" CHECK, FOUND CORROSION ON AFT CORNER OF FORWARD CARGO DOOR LOWER CUTOUT SKIN. REPAIRED PER EA 99-209907.

Part: SKIN — FAILED (FUSELAGE) · airframe 83,091 hrs · 92,274 cycles

THE AIRCRAFT WAS CLIMBING THROUGH FL200 WHEN IT EXPERIENCED A RAPID DECOMPRESSION OF THE CABIN AFTER A LOUD BANG. CREW INITIATED AN EMERGENCY DESCENT TO 10,000 FT AND COMPLIED WITH COM PROCEDURES. THE CABIN THEN FILLED WITH A BURNING ODOR SO THE CREW DIVERTED TO AN EMERGENCY LANDING AT BUF AND LANDED WITHOUT FURTHER INCIDENT. CFR CONFIRMED NO FIRE OR SMOKE AND THE AIRCRAFT TAXIED TO THE GATE. MAINTENANCE DISCOVERED A HOLE IN THE FUSELAGE FORWARD OF THE FWD CARGO DOOR. AIRCRAFT WAS FERRIED UN-PRESSURIZED TO MSP WHERE MAINTENANCE REPAIRED THE DAMAGED SKIN AND VERIFIED THAT THERE WAS NO DAMAGE TO ANY LONGERON. THE AIRCRAFT HAS RETURNED TO SERVICE.

Part: CYLINDER — MALFUNCTIONED (MLG) · airframe 82,291 hrs · 91,671 cycles

AFTER DEPARTURE, THE FLIGHT CREW NOTICED A LOSS OF HYDRAULIC FLUID FROM THE RIGHT HYDRAULIC SYSTEM AND THEN SYSTEM PRESSURE DIMINISHED TO ZERO. COM PROCEDURES WERE COMPLIED WITH AND WHEN THE LANDING GEAR FAILED TO EXTEND NORMALLY CREW UTILIZED THE ALTERNATE EXTENSION METHOD. THE AIRCRAFT LANDED UNEVENTFULLY AT SCHEDULED DESTINATION OF MSP. MAINTENANCE REPLACED A DAMAGED RIGHT MAIN LANDING GEAR RETRACT CYLINDER. ALSO REPLACED BOTH MAIN GEAR DOOR SKIDS DUE TO FLOATING DOORS DURING LANDING. THE RIGHT ENGINE DRIVEN HYDRAULIC PUMP AND ASSOCIATED FILTERS WERE ALSO REPLACED. FUNCTIONAL CHECKS AND LEAK CHECKS WERE GOOD AND THE AIRCRAFT HAS RETURNED TO SERVICE.

Part: BULKHEAD — CORRODED (FUSELAGE) · corrosion level 2 · airframe 70,395 hrs · 82,809 cycles

CORROSION ON AFT PRESSURE BULKHEAD DOUBLER AT JACK PAD AREA. REPLACED DOUBLER PER EA 99-177281 AND SRM 51-30-2 AND 51-30-4.

Part: SPAR — CORRODED (LT WING) · corrosion level 2 · airframe 70,395 hrs · 82,809 cycles

BULGED CORROSION ON LEFT WING LEADING EDGE SPAR XRS 290. REMOVED FASTENERS, CUT OUT DAMAGE, FABRICATED FILLER FORM 7075-T6. FABRICATED DOUBLER FROM .063 17-7, HEAT TREATED TO 1050. REINSTALLED PER EA 99-177304.

Part: SPAR CAP — CORRODED (WING) · corrosion level 2 · airframe 70,395 hrs · 82,809 cycles

AREAS OF CORROSION ON WING STA XRS 225 TO 234 AND 260 TO 290. AREAS INCLUDED LEADING EDGE SKIN, SPAR CAP, WING SURFACE. REPAIRS ACOMPLISHED ACCORDING TO EA 99-177304 AND EA 99-177299. L/P''S 1498556, 1497625, 1497623, 1498548, 1498466, AND 1498473.

Part: PRESSURE PANEL — CRACKED (RT MLG WW) · airframe 70,395 hrs · 82,809 cycles

CRACKED ANGLE ABOVE SLANT PRESSURE PANEL IN RT MLG W/W 20 INCHES OF C/L APPROX 2 INCHES LONG. REPAIRED PER EA 99-177258. L/P 1497078

Part: DOUBLER — CORRODED (DOOR FRAME) · corrosion level 2 · airframe 70,395 hrs · 82,809 cycles

CORROSION ON INSIDE OF THE AFT CARGO DOOR JAMB INTERNAL PLATING DOUBLER AT FWD LOWER CORNER AND AT MIDDLE LOWER AREA. REMOVED DAMAGED AREA, FABRICATED NEW DOUBLER PER EA 99-177242. L/P 1496935

Part: SHUTOFF VALVE — LEAKING (RUDDER) · airframe 70,265 hrs · 82,717 cycles

SMOKE AND HAZE REPORTED IN CABIN DURING TAXI-OUT. PASSENGERS COMPLAINED OF BURNING EYES. AIRCRAFT WAS RETURNED TO THE GATE. MAINTENANCE REPLACED THE RUDDER HYDRAULIC POWER SHUTOFF VALVE WHICH WAS LEAKING FLUID INTO APU INTAKE. ALSO, REPLACED COALESCER BAGS DUE TO CONTAMINATION. AIRCRAFT RETURNED TO SERVICE.

Part: POWER SUPPLY — FAILED (CABIN)

LEFT FORWARD OVERWING EMERGENCY EXIT LIGHT INOPERATIVE. REPLACED POWER SUPPLY, OPERATIONAL CHECK NORMAL.

Part: WINDSHIELD — CRACKED (LT COCKPIT)

ON LEVEL OFF AT FL330, FOUND A CRACK IN THE FIRST OFFICER'S WINDSHIELD, ACCOMPLISHED COM PROCEDURE. FLIGHT RETURNED TO DTW AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED WINDSHIELD. AIRCRAFT RETURNED TO SERVICE.

Part: INDICATOR — FAILED (COCKPIT)

FLIGHT WAS EN ROUTE AND APPROXIMATELY FORTY MILES FROM DESTINATION WHEN AN UNUSUAL FUEL QUANTITY IMBALANCE WAS EXPERIENCED AND THE FUEL QUANTITY TEST FUNCTION BECAME INOPERATIVE. THE CAPTAIN DECLARED A FUEL EMERGENCY AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE RIGHT MASTER FUEL QUANTITY INDICATOR. OPERATIONAL CHECK OK.

Part: CONNECTOR — LOOSE (CABIN)

FLIGHT ATTENDANT REPORTED FLOOR PROXIMITY LIGHTS BETWEEN ROWS 3 AND 6 INOPERATIVE. MAINTENANCE FOUND FEEDER PLUG AT 6L UNPLUGGED. RECONNECTED PLUG, OPERATIONAL CHECK NORMAL.

Part: FITTING — CRACKED (BS 579)

DURING M-CHECK, FOUND CRACK IN LONGERON END FITTING FS 579, LONGERON 29L. REPLACED FITTING PER SRM 51-30-5.

Part: FLOORBEAM — CRACKED (BS 237)

DURING M CHECK, FOUND CRACK IN FLOORBEAM AT FS 237 UNDER AFT SIDE OF FLOOR PANEL NR 23. REPAIRED PER EA 99-151684.

Part: FITTING — CRACKED (BS 580)

DURING M-CHECK, FOUND CRACKED LONGERON END FITTING LONGERON 29L, FS 580. REPLACED FITTING PER SRM 51-30-5.

Part: LONGERON — CORRODED (BS 608)

DURING M-CHECK, FOUND CORROSION ON FORWARD END OF LONGERON 30 AT FS 608. REPAIRED PER EA 99-151679.

Part: JAMB — CRACKED (AFT PRESS BLKHD)

DURING M CHECK, FOUND CRACK ON THE 5910130-9 CHANNEL AT THE LEFT AFT PRESSURE BULKHEAD DOOR JAMB. REPAIRED PER EA 99-151653.

Part: CALL SWITCH — WIRE FAILED (LT AFT LAVATORY)

LEFT AFT LAVATORY SMOKE DETECTOR SOUNDED DURING TAXI-OUT. AIRCRAFT WAS RETURNED TO THE GATE. MAINTENANCE FOUND LAVATORY CALL BUTTON JAMMED AND WIRING BURNED BEHIND SWITCH. REPLACED SWITCH AMD MODULE, OPERATIONAL CHECK NORMAL.

Part: RELEASE MECH — OUT OF ADJUST (TAILCONE)

DURING TAIL CONE FUNCTIONAL CHECK, FOUND THAT EXCESSIVE FORCE WAS REQUIRED TO DEPLOY TAIL CONE. RIGGED TAIL CONE RELEASE SYSTEM, FUNCTIONAL CHECK OK.

Part: BATTERIES — DISCHARGED (COCKPIT)

COCKPIT EMERGENCY LIGHTS INOPERATIVE DURING TEST. REPLACED BATTERIES IN PACK. OPERATIONAL CHECK NORMAL.

Part: BULKHEAD — CRACKED (BS 105)

DURING LINE CHECK, FOUND CRACK IN NOSE LANDING GEAR WHEEL WELL HORIZONTAL PRESSURE BULKHEAD AT FS 105. REPAIRED PER EA 99-122993.

Part: POWER LEVER — OBSTRUCTED (LT ENGINE)

AS POWER WAS REDUCED FOR DESCENT, THE LEFT ENGINE POWER LEVER WOULD NOT RETARD FROM CURRENT POSITION. CREW CONTINUTED TO DESCEND AND AT FL200 THE POWER LEVER BEGAN TO FUNCTION NORMALLY. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND FIRE RETARDANT MATERIAL OBSTRUCTING LEFT ENGINE CONTROL CABLE PULLEY. MATERIAL WAS REMOVED, OPERATIONAL CHECK OK.

Part: STRUT — INOPERATIVE (NLG)

AIRCRAFT FAILED TO SHIFT FROM GROUND MODE TO FLIGHT MODE AFTER TAKEOFF. AIRCRAFT WOULD NOT PRESSURIZE AND NOSE WHEEL WAS STEERABLE. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE LUBED GROUND SHIFT MECHANISM AND REPLACED NOSE GEAR STRUT ASSEMBLY, OPERATIONAL CHECK NORMAL.

Part: FUEL CONTROL — MALFUNCTIONED (LT ENGINE)

DURING TAKEOFF ROLL AT 75 KNOTS, THE LEFT ENGINE EPR, FUEL FLOW, AND N1 INDICAITONS BEGAN FLUCTUATING. CREW ABORTED TAKEOFF AND RETURNED TO THE GATE. MAINTENANCE REPLACED THE LEFT ENGINE FUEL CONTROL. RAN ENGINE TO TAKEOFF POWER AND ALL PARAMETERS WERE NORMAL.

Part: POWER SUPPLY — INOPERATIVE (TAIL COMPT)

DURING LINE MAINTENANCE INSPECTION, FOUND TAIL COMPARTMENT EMERGENCY LIGHTS INOPERATIVE. REPLACED POWER SUPPLY B5-28, OPERATIONAL CHECK NORMAL.

Part: BATTERIES — DISCHARGED (CABIN)

DURING LINE MAINTENANCE INSPECTION, FOUND OVERHEAD EMERGENCY LIGHTS JUST AFT OF FIRST CLASS CABIN INOPERATIVE. REPLACED BATTERIES, OPERATIONAL CHECK NORMAL.

Part: BATTERY PACK — DISCHARGED (CABIN)

DURING LINE CHECK, FOUND EMERGENCY EXIT LIGHTS INOPERATIVE AT FORWARD ENTRY DOOR AND BOTH AFT OVERWING DOORS INOPERATIVE. REPLACED FUSE AT ENTRY DOOR AND REPLACED BATTERIES IN PACKS AT BOTH OVERWING EXITS, ALL OPERATIONAL CHECKS GOOD.

Part: BATTERY PACK — DISCHARGED (CABIN)

DURING LINE MAINTENANCE INSPECTION, FOUND TAIL COMPARTMENT EMERGENCY PATH LIGHTING INOPERATIVE. REPLACED BATTERY PACK, OPERATIONAL CHECK NORMAL.

Part: LONGERON — CRACKED (WS 58)

DURING SPECIAL MAINTENANCE VISIT, FOUND TWO CRACKS IN THE CENTER WING, STR 13, AT WS 58R. REPAIRED STRINGER PER EA 99-106792.

Part: DOOR JAMB — CORRODED (CARGO COMPT)

DURING L-CHECK, FOUND CORROSION IN THE FORWARD CARGO DOOR JAMB PAN SPLICE JOINTS. REPAIRED PAN (P/N 5912494-501) PER EA 99-103354.

Part: SLIDE — LOW BATTERY (MAIN CABIN DOOR)

DURING PERIODIC CHECK, MAIN CABIN DOOR EVACUATION SLIDE FAILED BATTERY CHECK. REPLACED SLIDE. OPERATIONAL CHECK GOOD.

Part: RADAR INDICATOR — MALFUNCTIONED (COCKPIT)

EN ROUTE MSP-IAD, RADAR BEGAN SPOKING IN LEFT 60 DEGREE QUADRANT AND WOULD NOT PAINT IN THIS AREA. FLIGHT DIVERTED TO CLE DUE TO THUNDERSTORMS AHEAD. REPLACED RADAR INDICATOR. OPERATIONAL CHECK OK. AIRCRAFT RETURNED TO SERVICE.

Part: SKIN — CRACKED (RUDDER)

DURING LINE CHECK, FOUND CRACKS AND LOOSE RIVETS IN THE LEFT SIDE RUDDER SKIN. REPLACED RUDDER PER CITEXT 90-2720-1-9801.