N926NW

Part: POWER SUPPLY — DISCHARGED (CABIN) · airframe 85,513 hrs · 84,367 cycles

DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROWS 18-21 OF THE CABIN WERE INOPERATIVE. MAINTENANCE REPLACED THREE BATTERY POWER SUPPLIES BEFORE THE LIGHTS RETURNED TO AN OPERATIONAL CONDITION.

Part: POWER SUPPLY — INOPERATIVE (EMERGENCY LIGHTS)

DURING CHECK, MX FOUND THA THE EMERGENCY PATHWAY LIGHTING IN ROWS 18-21 OF THE CABIN WERE INOPERATIVE. MX FOUND THE POWER SUPPLY INOPERATIVE, REPLACED IT, AND THE LIGHTS RETURNED TO AN OPERATIONAL CONDITION. (K)

Part: BATTERY — INOPERATIVE (EMERGENCY LIGHTS)

DURING LINE CHECK, BOT OF THE AFT OVERWIN EMERGENCY EXIT SIGNS WERE FOUND TO BE INOPEATIVE. MX REPLACED THE BATTERIES IN THE POWER SUPPLY AND THE LIGHTS RETURNED TO AN OPERATIONAL CONDITION. (K)

Part: CLAMP — MISSING (DUCT) · airframe 84,104 hrs · 83,239 cycles

DURING CRUISE AT FL340, FLT CREW HEARD A THUMP & NOTICED CABIN ALTITUDE CLIMBING 500-700 FPM. CONFIRMED THAT OUTFLOW VALVE WAS FULLY CLOSED & CABIN WAS AT 8000 FT & CLIMBING, INITIATED A DESCENT & COMPLIED WITH RED BORDERED CHECKLIST. DURING DESCENT TO 10,000 FT, CREW WAS ABLE TO STOP CABIN CLIMB. FLT LANDED AT DESTINATION WITHOUT FURTHER INCIDENT. MX FOUND THE LT WATER SEPARATOR INLET DUCT CLAMP WAS MISSING. CLAMP WAS LOCATED ON THE FLOOR AND REINSTALLED. ALL OTHER CLAMPS ON AFT SIDE OF BOTH THE LT & RT WATER SEPARATOR SYSTEM REPLACED. LT AFT CONNECTOR BOOT REPLACED. NUTS FOR EACH CLAMP ON FWD SIDE OF WATER SEPARATOR SYSTEM REPLACED. LEAK CHECK WAS SATISFACTORY AND ACFT RELEASED FOR SERVICE.

Part: WIRE HARNESS — CRUSHED (EMERGENCY LIGHTS) · airframe 83,141 hrs · 82,467 cycles

DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROWS 18-21 OF THE CABIN WERE INOPERATIVE. FURTHER INSPECTION REVEALED THAT THE WIRE HARNESS UNDER SEAT ROW 20 AND 21 WAS SMASHED AND CAUSING A SHORT. THE WIRING WAS REPLACED, AS WAS THE FUSE, AND THE SYSTEM FUNCTIONAL CHECK WAS GOOD.

Part: BATTERY PACK — INOPERATIVE (EMERGENCY LIGHTS) · airframe 83,114 hrs · 82,448 cycles

DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROWS 10-21 OF THE CABIN WERE INOPERATIVE. MAINTENANCE REPLACED THE BATTERIES. OPERATIONAL CHECK WAS GOOD.

Part: TERMINAL — BURNED (TRANSFORM REC) · airframe 82,551 hrs · 82,022 cycles

DURING THE DESCENT THROUGH 10,000 FEET INTO MSP, THE CAPTAIN NOTICED FUMES LIKE BURNED INSULATION IN THE COCKPIT. FUMES WENT AWAY SLIGHTLY AND THEN WERE STRONGER AGAIN AROUND 6000 FT. 1ST OFFICER CONFIRMED HE DETECTED IT ALSO. CAPTAIN DONNED O2 MASK FOR REMAINDER OF APPROACH. AFTER AN UNEVENTFUL LANDING WHEN O2 MASK WAS REMOVED, THE ODOR WAS MUCH MORE NOTICEABLE. ALL ELECTRICAL INDICATORS IN USE WERE SHOWING NORMAL AND THERE WAS NO OTHER ODORS, SMOKE, OR ABNORMAL NOISE. MX TROUBLESHOT AND FOUND THE NR 2 TRANSFORMER RECTIFIER OVERHEATING. ALSO, FOUND A 50 AMP CIRCUIT BREAKER AND WIRE/TERMINAL (09-2493-3-1790) BEHIND THE CAPTAINS' SEAT BURNED. AFFECTED PARTS WERE REPLACED, FUNCTIONAL CHECKS WERE GOOD, PACK BURNOUT PROCEDURES COMPLETED, AND THE AIRCRAFT WAS RETURNED TO SERVICE.

Part: SKIN — CORRODED (BS 408) · corrosion level 2 · airframe 82,460 hrs · 81,942 cycles

DURING "H" CHECK, FOUND CORROSION ON INNER SURFACE OF FUSELAGE SKIN AT LOWER EDGE OF CARGO DOOR CUTOUT AT BS 408. REPAIRED PER EA 99-211057.

Part: COMPUTER — MALFUNCTIONED (AUTOPILOT) · airframe 77,000 hrs · 77,717 cycles

WHILE CRUISING AT FL340, THE AUTOPILOT PITCH BEGAN TO FLUCTUATE +/- 500 FPM WHILE IN "ALTITUDE HOLD". FLIGHT CREW SUSPECTED ALTERNATE TRIM WAS CAUSING THE DEVIATIONS. COMPLIED WITH COM PROCEDURES FOR RUNAWAY TRIM AND FLUCTUATIONS STOPPED. THEN AGAIN AT FL120, THE PRIMARY TRIM BEGAN MOVING EVEN WITH THE ALTERNATE TRIM CIRCUIT BREAKERS PULLED AND THE ELEVATOR SERVO IN OFF POSITION. ALSO, THE INBOARD MANUAL TRIM HANDLE WOULD NOT RETURN TO DETENT. LANDING AT DTW WAS UNEVENTFUL AND MAINTENANCE REPLACED THE PITCH AXIS COMPUTER AND INSTALLED A MISSING BELL CRANK ROLLER DETENT SPRING. AIRCRAFT WAS RE-QUALIFIED FOR LLM OPERATIONS AND HAS RETURNED TO SERVICE.

Part: COALESCER BAG — CONTAMINATED (BOTH) · airframe 76,538 hrs · 77,367 cycles

IMMEDIATELY AFTER TAKEOFF, THE FLIGHT ATTENDANT REPORTED VISIBLE SMOKE IN THE CABIN AND THE LAVATORY SMOKE DETECTORS IN ALARM. FLIGHT DECLARED AN EMERGENCY AND RETURNED TO AN UNEVENTFUL LANDING BACK AT FLL. NO MENTION OF COM OR APU/PACK CONFIGURATION. PASSENGERS DEPLANED NORMALLY THROUGH MAIN CABIN DOOR AND CFR FOUND NO EVIDENCE OF FIRE. MAINTENANCE COULD NOT FIND ANY FAULTS EXCEPT FOR A PUDDLE OF DE-ICING FLUID IN THE TAIL CONE AND EXTERIOR. THE DE-ICE FLUID WAS CLEANED UP, BOTH WATER SEPARATORS BAGS WERE REPLACED, AND PACK BURNOUT PROCEDURES WERE COMPLIED WITH. NO SMOKE OR SMELL PRESENT. AIRCRAFT RETURNED TO SERVICE.

Part: DOUBLER — CORRODED (BULKHEAD) · corrosion level 2 · airframe 769,482 hrs · 77,334 cycles

DURING M-CHECK FOUND CORROSION ON CANTED BULKHEAD DOUBLER AT BS 1211 STR 16L. REPAIRED PER EA 99-200911.

Part: SENSOR — MALFUNCTIONED (LT & RT MLG DOOR)

LANDING GEAR DOOR OPEN LIGHT ILLUMINATED ENROUTE BDL-DTW. FLIGHT WAS CONTINUED TO DESTINATION AND LIGHT REMAINED ON AFTER GEAR EXTENSION. EMERGENCY GEAR EXTENSION PROCEDURES WERE UTILIZED FOR LANDING. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED PSEU AND RIGHT AND LEFT MAIN GEAR DOOR PROXIMITY SENSORS. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.

Part: CONNECTOR — BROKEN (DOWNLOCK SENSOR)

NOSE LANDING GEAR UNSAFE LIGHT REMAINED ON AFTER GEAR RETRACTION. CREW EXTENDED GEAR, DECLARED AN EMERGENCY, AND PERFORMED FLY-BY OF TOWER TO DETERMINE IF GEAR WAS DOWN AND LOCKED. FLIGHT WAS RETURNED TO MEM AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND CANNON PLUG P1-1157 TO DOWN AND LOCK SENSOR BROKEN. REPLACED PLUG. BITE CHECK FAULTED DOWNLOCK SENSOR. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.

Part: BULKHEAD — BULGED (BS 604)

DURING LINE MAINTENANCE INSPECTION, FOUND BULGE IN LOWER FUSELAGE SKIN ADJACENT TO FS 604 BULKHEAD 'T' CAP. REPAIRED PER EA 99-153395.

Part: POWER SUPPLY — INOP (COCKPIT)

COCKPIT EMERGENCY LIGHTS WOULD NOT ILLUMINATE. REPLACED POWER SUPPLY. OPERATIONAL CHECK NORMAL.

Part: BULKHEAD SKIN — CRACKED (BS 1038)

DURING PERIODIC CHECK, FOUND ONE INCH CRACK IN AFT SKIN ON BULKHEAD AT FS 1038, LONGERON 10. INSTALLED REPAIR PER SRM 51-30-5 AND EA 99-159472.

Part: SKIN — CRACKED (VERT STAB)

DURING PERIODIC CHECK, FOUND CRACK IN VERTICAL STABILIZER SKIN ON LEFT SIDE ABOVE RUDDER. INSTALLED DOUBLER REPAIR PER EA 99-159482.

Part: SPAR CAP — CRACKED (RT HORIZ STAB)

DURING M CHECK, FOUND CRACK ON RIGHT HORIZONTAL STABILIZER XRS 223 UPPER AFT SPAR OUTBOARD END. REPAIRED PER EA 99-159470.

Part: BATTERIES — DISCHARGED (CABIN)

DURING LINE MAINTENANCE INSPECTION, FOUND FIRST CLASS SECTION OF EMERGENCY LIGHTS INOPERATIVE. REPLACED BATTERIES. OPERATIONAL CHECK NORMAL.

Part: TEMP SENSOR — FAILED (RIGHT)

RIGHT AIR CONDITIONING SUPPLY TEMPERATURE HIGH LIGHT ILLUMINATED DURING TAKEOFF ROLL. TAKEOFF WAS ABORTED AT APPROXIMATELY 15 KNOTS AND AIRCRAFT RETURNED TO THE GATE. MAINTENANCE REPLACED TEMPERATURE SENSOR, OPERATIONAL CEHCK NORMAL.

Part: CONTROL SECTOR — LOOSE (AILERON CONTL)

AILERON CONTROL WHEEL HAD TO BE ROTATED 10 DEGREES BEFORE AILERON MOVEMENT. FLIGHT RETURNED TO MEM AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND BOTH AILERON LATERAL CONTROL SECTORS LOOSE ON SHAFT. REPLACED LEFT AND RIGHT MIXER INPUT DRUMS, SHAFTS AND CONTROL DRUMS, OPERATIONAL CHECK NORMAL.

Part: DRIVE MOTOR — FAILED (HORIZ STAB)

PRIMARY LONGITUDINAL TRIM FAILED AFTER TAKEOFF. CIRCUIT BREAKERS H3, H4, H7, H8, H12, AND H14 WERE ALSO OPEN. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED PRIMARY DRIVE STABILIZER MOTOR, OPERATIONAL CHECK NORMAL.

Part: POWER SUPPLY — FAILED (TAIL COMPARTMENT)

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

Part: BULKHEAD ANGLE — CRACKED (BS 37)

DURING L-CHECK, FOUND A CRACK IN LOWER T-ANGLE ON THE NOSE LANDING GEAR WHEEL WELL FS 37 BULKHEAD. REPAIRED PER EA 99-151597.

Part: FLOORBEAM — CORRODED (BS 935)

DURING L-CHECK, FOUND CORROSION ON LOWER SURFACE OF CENTER FLOORBEAM AT FS 935. REPAIRED PER EA 99-151595.

Part: BATTERY PACK — DISCHARGED (CABIN)

DURING LINE MAINTENANCE INSPECTION, FOUND TAIL COMPARTMENT EMERGENCY LIGHTS AT CATWALK INOPERATIVE. REPLACED BATTERY PACK AND RELAMPED, OPERATIONAL CHECK NORMAL.

Part: CONNECTOR — LOOSE (CABIN)

DURING LINE MAINTENANCE INSPECTION, FOUND EMERGENCY LIGHTS AT SEATS 8, 9, AND 10 INOPERATIVE. FOUND LOOSE CONNECTION AT POWER SUPPLY UNIT. TIGHTENED CONNECTION, OPERATIONAL CHECK OK.

Part: FRAME — CRACKED (TAIL CONE)

DURING LINE CHECK, FOUND CRACK IN TAILCONE ATTACH FRAME APPROXIMATELY 14 INCHES UP FROM LOWER RIGHT LATCH ASSEMBLY. REPAIRED PER EA 99-124107.

Part: POWER SUPPLY — INOPERATIVE (CABIN)

DURING LINE MAINTENANCE INSPECTION, FOUND CABIN OVERHEAD EMERGENCY LIGHTS INOPERATIVE. REPLACED POWER SUPPLY. OPERATIONAL CHECK NORMAL.

Part: BATTERY — DISCHARGED (CABIN)

DURING PERIODIC CHECK, FOUND EMERGENCY SEAT LIGHTS FROM ROW 18 TO REAR INOPERATIVE. CHARGED BATTERY, OPERATIONAL CHECK NORMAL.

Part: PITOT LINES — WATER CONTAM (RIGHT)

FIRST OFFICER'S AIRSPEED INDICATION FAILED DURING TAKEOFF ROLL. ABORTED TAKEOFF AT 80 KNOTS AND RETURNED TO THE GATE. MAINTENANCE DRAINED LOW POINT OF PITOT LINES IN NOSE WHEEL WELL AND E/E COMPARTMENT, OPERATIONAL CHECK NORMAL DURING SYSTEM TEST.

Part: SKIN — CRACKED (WS 242)

DURING PERIODIC CHECK, FOUND RIGHT WING FIXED LEADING EDGE SKIN CRACKED AT WS 242. ACCOMPLISHED INTERIM REPAIR PER EA 99-120700.

Part: POWER SUPPLY — MALFUNCTIONED (CABIN)

DURING LINE MAINTENANCE INSPECITON, FOUND EMERGENCY EXIT LIGHT SIGN ABOVE FORWARD OVERWING DOOR INOPERATIVE. REPLACED POWER SUPPLY, OPERATIONAL CHECK NORMAL.

Part: PANEL — CRACKED (WS 250)

DURING PERIODIC CHECK, FOUND RIGHT WING INBOARD FUEL PANEL CRACKED EXTENDING BEYOND DOUBLER AND CRACKED AT TRACK OPENING AT WS 250, LEADING EDGE. INSTALLED REPAIR DOUBLER PER EA 99-120700, L/P 0907644.

Part: POWER SUPPLY — MALFUNCTIONED (TAILCONE)

DURING LINE MAINTENANCE INSPECTION, FOUND TAILCONE EMERGENCY LIGHTS INOPERATIVE. REPLACED BATTERIES AND POWER SUPPLY, OPERATIONAL CHECK NORMAL.

Part: POWER SUPPLY — INOPERATIVE (TAILCONE)

DURING LINE MAINTENANCE INSPECTION, FOUND CATWALK EMERGENCY LIGHTS IN TAILCONE INOPERATIVE. REPLACED POWER SUPPLY AND BATTERY PACK, OPERATIONAL CHECK NORMAL.

Part: WIRE — BROKEN (CABIN)

DURING LINE MAINTENANCE INSPECTION, FOUND AFT STAIRWELL EMERGENCY LIGHTS INOPERATIVE. REPAIRED BROKEN WIRES L795G18 AND L795K18 AT FEED THROUGH P3-13, OPERATIONAL CHECK NORMAL.

Part: CONNECTOR — DISCONNECTED (CABIN)

DURING LINE CHECK, FOUND EMERGENCY LIGHTS AT ROWS 8, 9 AND 10 INOPERATIVE. FOUND CONNECTOR BEHIND WALL PANEL AT 10R DISCONNECTED. RECONNECTED, OPERATIONAL CHECK OK.

Part: FUEL CONTROL — LACK OF LUBE (NR 2 ENGINE)

ON CLIMBOUT, THE NR 2 ENGINE EPR INDICATION SPIKED .4 WITH A CORRESPONDING RISE IN N1. THE FLIGHT RETURNED TO MEM AND LANDED WITHOUT INCIDENT. MAINTENANCE DRAINED THE MOISTURE TRAP AND LUBED THE FUEL CONTROL BELLOWS. ENGINE RUNUP WAS SATISFACTORY.

Part: POSITION SWITCH — FAILED (NLG)

DURING APPROACH INTO HOU, NOSE LANDING GEAR GREEN LIGHT DID NOT ILLUMINATE AFTER GEAR WAS EXTENDED. RECYCLED GEAR AND NORMAL INDICATIONS WERE ACHIEVED. MAINTENANCE REPLACED NOSE LANDING GEAR LOCK SWITCH, OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.

Part: BATTERY PACK — DISCHARGED (TAILCONE)

DURING LINE CHECK, FOUND CATWALK AND TAILCONE EMERGENCY LIGHTS INOPERATIVE. REPLACED THE BATTERY PACK, OPERATIONAL CHECK GOOD.

Part: PRESSURIZATION — MALFUNCTIONED (CABIN)

DURING TAKEOFF, THE AIRCRAFT STARTED TO PRESSURIZE NEGATIVELY. PROBLEM CONTINUED DURING CLIMB AND COULD NOT CONTROL CABIN MANUALLY. AIRCRAFT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. REPLACED THE DIFFERENTIAL PRESSURE SENSOR, OUTFLOW VALVE ACTUATOR, AND PRESSURE CONTROLLER. OPERATIONAL CHECK GOOD.

Part: RELEASE CABLE — FRAYED (TAILCONE)

DURING H-CHECK, FOUND THAT INADEQUATE FORCE WAS REQUIRED TO REMOVE THE EXTERIOR HANDLE FROM THE CLIPS AND TO DROP THE TAILCONE. ALSO, FOUND A FRAYED RELEASE CABLE AND A WORN UPPER LEFT SLIDER BLOCK. REPLACED THE CABLE AND SLIDER BLOCK AND RERIGGED THE RELEASE SYSTEM, CHECKED OK.

Part: ANGLE — CORRODED (FS 198-203)

DURING H-CHECK, FOUND CORROSION IN THE UPPER CUSP ANGLE AT THE MAIN CABIN DOOR FS 198 TO 203. REPAIRED ANGLE (P/N 9910078-9), PER EA99-103303.

Part: FLOORBEAM — CORRODED (FS 689-699)

DURING H-CHECK, FOUND CORROSION IN THE BL 0 FLOOR CAP BETWEEN FS 689 TO 699. REPAIRED CAP (P/N 5910347-25), PER EA 99-103291.

Part: WEB — CORRODED (FS 699)

DURING H-CHECK, FOUND CORROSION IN THE LEFT MAIN LANDING GEAR WHEEL WELL FORWARD SLANT PRESSURE PANEL WEB. REPAIRED WEB (P/N 5956065-41), PER EA 99-102597.

Part: BLKHD FITTING — CRACKED (FS 521)

DURING H-CHECK, FOUND A CRACK IN THE LOWER RIGHT HORIZONTAL STIFFENER END FITTING AT THE FS 521 BULKHEAD. REPLACED FITTING PER SRM 51-30-2.

Part: FRAME — CRACKED (OVERWING EXITS)

DURING H-CHECK, FOUND CRACKS IN ALL FOUR OVERWING EMERGENCY EXIT DOOR PANS, BENEATH NR 14 SUPPORT. REPAIRED PANS (P/N 5913195-1) PER EA 99-103294, -103295, -103296 AND -103297.

Part: SWITCH — MALFUNCTIONED (T/O WARNING)

TAKEOFF WARNING HORN SOUNDED WHEN THROTTLES WERE ADVANCED FOR TAKEOFF. CYCLED FLAPS AND SPEED BRAKES, NO HELP. ABORTED TAKEOFF AT 10 TO 20 KNOTS AND RETURNED TO GATE. REPLACED TAKEOFF WARNING SWITCH. OPERATIONAL CHECK OK AND AIRCRAFT RETURNED TO SERVICE.

Part: LE SPAR — CRACKED (RT SPOILER)

DURING "A" CHECK, FOUND 9.5 INCH CRACK IN THE RIGHT INBOARD FLIGHT SPOILER LEADING EDGE SPAR. REPLACED SPOILER PER CITEXT 90-2760-1-9901.