N89S

Part: FITTING — CRACKED · airframe 80,084 hrs · 90,815 cycles

Found 1/2" crack in large flat casting that bolts to the top of the trap fitting lt w/well. Replaced fitting. l/p 1676019

Part: SOCKET — INOPERATIVE (CABIN)

DURING LINE CHECK, FOUND SEAT ROW 12 RIGHT SIDE EMERGENCY PATHWAY LIGHTING INOPERATIVE. MAINTENANCE REPLACED LIGHT SOCKET, OPERATIONAL CHECK NORMAL.

Part: CONNECTOR — LOOSE (CABIN)

OVERWING EMERGENCY EXIT LIGHT AT SEAT 12D INOPERATIVE. RESEATED CONNECTOR. OPERATIONAL CHECK NORMAL.

Part: BATTERIES — DISCHARGED (TAIL CONE)

EMERGENCY LIGHTS ON BOTH SIDES OF CATWALK INOPERATIVE. REPLACED BATTERIES. OPERATIONAL CHECK NORMAL.

Part: COMPUTER — FAILED (E/E COMPT)

RUDDER OSCILLATION WITH AIRCRAFT YAW OCCURRED AFTER TAKEOFF. FLIGHT WAS RETURNED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED STABILIZATION AUGMENTATION COMPUTER AND RUDDER YAW DAMPER ACTUATOR, OPERATIONAL CHECK NORMAL.

Part: BATTERIES — DISCHARGED (CABIN)

DURING LINE MAINTENANCE INSPECTION, FOUND AFT CABIN EMERGENCY LIGHTS INOPERATIVE. REPLACED BATTERIES. OPERATIONAL CHECK NORMAL.

Part: BATTERY PACK — DISCHARGED (CABIN)

EMERGENCY LIGHTS WIRING IN THE FIRST CLASS SECTION WAS FOUND DISABLED. MAINTENANCE REPAIRED WIRES AND REPLACED BATTERY PACK AND FUSE, OPERATIONAL CHECK OK.

Part: CONTROLLER — FAILED (CABIN)

LOSS OF CABIN PRESSURIZATION OCCURRED DURING CLIMB-OUT FROM MDW. CREW SWITCHED TO MANUAL PRESSURIZATION CONTROL AND CONTINUED TO DESTINATION (MSP) AT 10,000 FEET ALTITUDE. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED CABIN PRESSURE CONTROLLER. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.

Part: CONNECTORS — FAILED (CABIN)

DURING LINE MAINTENANCE INSPECTION, FOUND LEFT FORWARD OVERWING EMERGENCY EXIT LIGHTS INOPERATIVE. REPAIRED TERMINALS, OPERATIONAL CHECK NORMAL.

Part: NAV RECEIVER — FAILED (NR 1)

NR 1 NAV FLAGGED AFTER TAKEOFF. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED NR 1 NAV RECEIVER, OPERATIONAL CHECK NORMAL.

Part: FUEL CONTROL — CONTAMINATED (RT ENGINE)

AS TAKEOFF POWER WAS APPLIED, THE RIGHT ENGINE EPR, N1, AND N2 INDICATIONS BEGAN FLUCTUATING. CREW ABORTED TAKEOFF AND RETURNED TO THE GATE. MAINTENANCE DRAINED THE FUEL CONTROL MOISTURE TRAP ON THE RIGHT ENGINE, OPERATIONAL CHECK OK.

Part: CONTROL PANEL — FAILED (COCKPIT)

AFTER TAKEOFF, WEATHER RADAR BECAME INTERMITTENT. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED RADAR CONTROL PANEL, OPERATIONAL CHECK OK.

Part: BULBS — DIRTY (TAIL COMPT)

DURING LINE MAINTENANCE INSPECTION, FOUND OVERHEAD EMERGENCY LIGHTS IN TAIL COMPARTMENT INOPERATIVE. CLEANED BULB CONTACTS, OPERATIONAL CHECK NORMAL.

Part: EPR TRANSMITTER — FAILED (RT ENGINE)

AS POWER WAS APPLIED FOR TAKEOFF THE RIGHT ENGINE EPR INDICATION WAS INOPERATIVE. CREW ABORTED TAKEOFF AND RETURNED TO GATE. MAINTENANCE REPLACED THE RIGHT ENGINE EPR TRANSMITTER, OPERATIONAL CHECK WAS OK.

Part: BATTERIES — DISCHARGED (CABIN)

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

Part: INDICATION — MALFUNCTIONED (NLG)

DURING FLIGHT, RED NOSE GEAR UNSAFE LIGHT DID NOT ILLUMINATE WITH THROTTLES AT FLIGHT IDLE. ON APPROACH, NOSE GEAR GREEN LIGHT DID NOT ILLUMINATE. RECYCLED GEAR TWO TIMES AND NORMAL INDICATIONS WERE ACHIEVED. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE CYCLED NOSE GEAR SEVERAL TIMES. PROBLEM COULD NOT BE DUPLICATED. REPLACED NOSE GEAR DOWNLOCK SWITCH AS A PRECAUTION. ALSO, REPLACED NOSE GEAR BUNGEE CYLINDER FOR BYPASSING, OPERATIONAL CHECK GOOD.

Part: DOWNLOCK SWITCH — MALFUNCTIONED (NLG)

ON APPROACH, THE NOSE GEAR GREEN DOWNLOCK LIGHT DID NOT ILLUMINATE AFTER GEAR WAS EXTENDED. RECYCLED GEAR AND NORMAL INDICATIONS WERE ACHIEVED. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE COULD NOT DUPLICATE DISCREPANCY ON GROUND. REPLACED NOSE GEAR DOWNLOCK SWITCH AS A PRECAUTION, OPERATIONAL CHECK NORMAL ON GEAR SWING.

Part: ANTI-ICE VALVE — MALFUNCTIONED (LT MLG WW)

AIRFOIL ICE PROTECTION PRESSURE ABNORMAL LIGHT ILLUMINATED WITH TAIL ANTI-ICE SELECTED AFTER TAKEOFF. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED WING ANTI-ICE VALVE, OPERATIONAL CHECK NORMAL.

Part: BLKHD SPLICE — CORRODED (BS 756)

DURING H-CHECK, FOUND CORROSION ON THE FS 756 BULKHEAD T-SPLICE BETWEEN LONGERON 29R TO 30. REPAIRED SPLICE (P/N 9958212-3) PER EA 99-110785.

Part: WEB — CRACKED (BS 108)

DURING H-CHECK, FOUND CRACKS IN THE NOSE LANDING GEAR HORIZONTAL PRESSURE WEB FS 108 AT LBL/RBL 25 AND 37 AT THE VERTICAL STIFFENER UPPER FITTING. REPAIRED WEB (P/N 9910073-313, 9911583) PER EA 99-110786.

Part: WEB — CRACKED (BS 83)

DURING H-CHECK, FOUND A 3.6 INCH CRACK IN THE NOSE LANDING GEAR HORIZONTAL PRESSURE WEB RIGHT FRAME FITTING FS 83. REPAIRED WEB (P/N 9910073-313) PER EA 99-110787.

Part: FITTING — CRACKED (NR 4 TE FLAP)

DURING H-CHECK, FOUND A CRACK IN THE NR 4 TRAILING EDGE FLAP INBOARD RIB TO SKIN ATTACH FITTING. REPLACED FITTING PER SRM 51-30-2.

Part: PT-7 LINE — BROKEN (NR 1 ENGINE)

DURING TAKEOFF, THE LEFT ENGINE EPR REACHED A MAX OF 1.85, NEEDED 1.95 FOR TAKEOFF. CREW ABORTED TAKEOFF AND RETURNED TO THE GATE. MAINTENANCE REPLACED PT-7 LINE. OPERATIONAL CHECK OK.

Part: BATTERY PACK — DISCHARGED (CABIN)

DURING PERIODIC CHECK, FOUND AFT OVERWING EMERGENCY EXIT LIGHT BATTERY PACK WITH NO OUTPUT. REPLACED BATTERY PACK, OPERATIONAL CHECK NORMAL.

Part: CIRCUIT BREAKERS — TRIPPED (FUEL BOOST PUMPS)

APPROXIMATELY THREE MINUTES AFTER TAKEOFF, NUMEROUS FUEL BOOST PUMP CIRCUIT BREAKERS POPPED. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED WIRING AT PUMP SWITCHES ON OVERHEAD PANEL, AT CIRCUIT BREAKER PANEL AND AT DISCONNECT AT FS 237, ALL CHECKED NORMAL. RAN PUMPS WITH ENGINE POWER, GROUND POWER AND APU POWER WITH NO PROBLEMS FOUND. DISCREPANCY COULD NOT BE DUPLICATED AND AIRCRAFT RETURNED TO SERVICE.

Part: SKIN — CRACKED (PAX DOOR JAMB)

DURING LINE CHECK, FOUND A 2.25 INCH CRACK IN THE MAIN CABIN DOOR UPPER AFT DOOR JAMB CORNER SKIN AND DOUBLER. REPAIRED SKIN (P/N 591406-5) AND DOUBLER PER EA 99-99570.

Part: BATTERIES — DISCHARGED (CABIN)

DURING LINE MAINTENANCE INSPECTION, FOUND AFT OVERWING EXIT EMERGENCY LIGHTS INOPERATIVE. REPLACED BATTERIES AND OPERATIONAL CHECK NORMAL.

Part: BATTERIES — DISCHARGED (EMERGENCY EXIT)

DURING LINE MAINTENANCE INSPECTION, FOUND MID CABIN OVERHEAD EMERGENCY EXIT LIGHTS DIM. REPLACED BATTERIES AND OPERATIONAL CHECK NORMAL.

Part: BULB — FAILED (RT MLG)

YEG - DURING APPROACH, RIGHT MAIN LANDING GEAR GREEN LIGHT DID NOT ILLUMINATE ON GEAR EXTENSION. CREW CONFIRMED VISUALLY THROUGH PERISCOPE THAT GEAR WAS DOWN AND LOCKED. AIRCRAFT LANDED WITHOUT INCIDENT. EMERGENCY EQUIPMENT WAS CALLED OUT ON STANDBY AS A PRECAUTION. CLEANED RIGHT MAIN GEAR DOWNLOCK SWITCH CONNECTOR AND RELAMPED INDICATOR LIGHTS. OPERATIONAL CHECK NORMAL AND AIRCRAFT RETURNED TO SERVICE.

Part: BATTERIES — DISCHARGED (CABIN)

DURING LINE CHECK, FOUND CENTER SECTION UPPER EMERGENCY LIGHTS INOPERATIVE. REPLACED BATTERIES. OPERATIONAL CHECK GOOD.

Part: POSITION SWITCH — BINDING (STABILIZER)

TAKE-OFF WARNING HORN SOUNDED WITH ALL CONDITIONS MET FOR TAKE-OFF. ABORTED TAKE-OFF AND RETURNED TO GATE. FOUND STABILIZER TAKE-OFF POSITION SWITCH (S1-141) STICKING. CLEANED AND LUBED SWITCH. OPERATIONAL CHECK OK. AIRCRAFT RETURNED TO SERVICE.

Part: RELAY — MALFUNCTIONED (EXTERNAL POWER)

GROUND SERVICE BUS FAILED AFTER TAKEOFF. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. REPLACED R2-48 EXTERNAL POWER GROUND SERVICE RELAY. OPERATIONAL CHECK OK, AIRCRAFT RETURNED TO SERVICE.

Part: SLIP JOINT — OUT OF POSITION (WING DE-ICE)

AIRFOIL ICE PROTECTION PRESSURE ABNORMAL LIGHT ILLUMINATED WITH WING AIRFOIL SYSTEM ANTI-ICE ACTIVATED. LIGHT EXTINGUISHED WITH TAIL ANTI-ICE ACTIVATED. AFTER CYCLE OF TAIL SYSTEM, THE LIGHT REILLUMINATED. FLIGHT DIVERTED TO ORD AND LANDED WITHOUT INCIDENT. REPLACED FORWARD ICE PROTECTION PRESSURE ABNORMAL SWITCH AND SUPPLY PRESSURE REGULATOR. ALSO, FOUND SLIP JOINT BETWEEN FIRST AND SECOND RIGHT WING SLATS OUT OF POSITION. RESECURED SLIP JOINT. OPERATIONAL CHECK OK ON GROUND. AIRCRAFT RETURNED TO SERVICE.

Part: OUTFLOW VALVE — ICE CONTAMINANT (AFT FUSELAGE)

DURING CLIMB-OUT FROM MDW, CABIN PRESSURE WARNING AND MASTER WARNING LIGHTS ILLUMINATED. PERFORMED MANUAL OPERATION BUT CONTROL WHEEL WAS HARD TO MOVE. WHEEL MOVEMENT EVENTUALLY LOOSENED AND NORMAL CABIN PRESSURE WAS ACHIEVED. FLIGHT CONTINUED TO DESTINATION (DTW) AND LANDED WITHOUT INCIDENT. FOUND ICE ACCUMULATION ON OUTFLOW VALVE. REMOVED ICE DEBRIS. OPERATIONAL CHECK OK. AIRCRAFT RETURNED TO SERVICE.

Part: CONTROL CABLE — BROKEN (NLG DOOR)

EXCESSIVE VIBRATION WAS COMING FROM THE NOSE LANDING GEAR AREA AFTER GEAR WAS RETRACTED. FLIGHT RETURNED TO MSO AND LANDED WITHOUT INCIDENT. UPON INSPECTION, FOUND NOSE GEAR DOOR STOP CABLE BROKEN. REMOVED BROKEN CABLE; CLOSED AND SECURED NOSE GEAR DOORS. DEFERRED REPAIR PER MEL 32-7. AIRCRAFT RETURNED TO SERVICE.