N761NC

Part: BATTERY PACK — INOPERATIVE (EMERGENCY LIGHTS) · airframe 79,111 hrs · 79,947 cycles

DURING LINE CHECK, MX FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROWS 1418 OF THE CABIN WERE INOPERATIVE. MX REPLACED THE BATTERIES IN THE POWER SUPPLY AND THE LIGHTS RETURNED TO AN OPS CONDITION.

Part: UNKNOWN — ODOR (CABIN) · airframe 78,844 hrs · 79,702 cycles

FLIGHT RETURNED TO A NORMAL SAFE LANDING BACK AT ATL DUE TO A BURNING SMELL IN THE CABIN. CABIN CREW VERIFIED THAT NO SMOKE WAS VISIBLE IN THE CABIN AND NO SMOKE DETECTORS WERE SOUNDING, BUT A STRONG NOXIOUS ODOR ("GARBAGE OR ELECTRICAL") PERSISTED. NO MENTION OF ANY SYSTEMS BEING SECURED. MAINTENANCE COMPLETED A BORESCOPE INSPECTION AND NO DAMAGE WAS REVEALED. DUCT BURNOUT WAS ACCOMPLISHED, COALESCER BAGS WERE REPLACED, AND THE AIRCRAFT RETURNED TO SERVICE.

Part: WIRE — CHAFED (EMERGENCY LIGHTS) · airframe 78,704 hrs · 79,576 cycles

THE PILOT REPORTED THAT AFTER ARRIVAL AT THE GATE AND FOLLOWING GROUND POWER CONNECTION, THE EMERGENCY PATHWAY LIGHTING CHARGING SYS CIRCUIT BREAKER POPPED AND WOULD NOT RESET. MX FOUND A WIRE CHAFING AT BATTERY PACK B5-40 AND REPAIRED IT. FUNCTIONAL CHECK OF THE SYS IS GOOD.

Part: BATTERY PACK — INOPERATIVE (EMERGENCY LIGHTS) · airframe 77,885 hrs · 78,862 cycles

DURING LINE CHECK, MX FOUND THAT LT OVER WING EMERGENCY EXIT SIGNS WERE INOPERATIVE. MX REPLACED THE BATTERY PACK AND THE LIGHT RETURNED TO AN OPS CONDITION.

Part: UNKNOWN — ODOR (CABIN) · airframe 77,872 hrs · 78,849 cycles

THE FLIGHT RETURNED TO DEPARTURE DUE TO STRONG ELECTRICAL SMELL IN THE FLIGHT DECK. THE FWD LAVATORY SMOKE DETECTOR ALSO WAS SOUNDING. GALLEY POWER WAS SELECTED OFF AND SMELL DISSIPATED. LANDING WAS UNEVENTFUL. MX COULD NOT DUPLICATE THE ELECTRICAL SMELL ON THE GROUND. NO EVIDENCE OF FIRE, BURNING, NOR OVERHEATED COMPONENTS OR MATERIAL WAS FOUND.

Part: WIRE — LOOSE (EMERGENCY LIGHTS) · airframe 77,581 hrs · 78,591 cycles

DURING LINE CHECK, MX FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROWS 14-18 OF THE CABIN WERE INOPERATIVE. MX FOUND A LOOSE WIRE IN THE CONNECTOR, REPAIRED THE CONNECTOR PIN AND THE SYS RETURNED TO NORMAL OPERATION.

Part: POWER SUPPLY — INOPERATIVE (EMERGENCY LIGHTS) · airframe 77,437 hrs · 78,463 cycles

DURING LINE CHECK, MX FOUND THAT THE EMERGENCY PATHWAY LIGHTING FOR THE CATWALK IN THE TAIL COMPARTMENT WAS INOPERATIVE. MX REPLACED THE EMERGENCY LIGHT POWER SUPPLY AND OPERATIONALLY CHECKED THE SYS.

Part: POWER SUPPLY — DISCHARGED (CABIN) · airframe 77,015 hrs · 78,103 cycles

DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING FOR THE CATWALK IN THE TAIL COMPARTMENT WAS INOPERATIVE. MAINTENANCE REPLACED THE EMERGENCY LIGHT POWER SUPPLY AND OPERATIONALLY CHECKED THE SYSTEM.

Part: BATTERY — DISCHARGED (CABIN) · airframe 76,572 hrs · 77,710 cycles

DURING LINE CHECK MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING FOR THE CATWALK IN THE TAIL COMPARTMENT WAS INOPERATIVE. MAINTENANCE REPLACED THE BATTERIES. OPERATIONAL CHECK WAS GOOD.

Part: WIRE — DAMAGED (EMERGENCY LIGHTS) · airframe 75,495 hrs · 76,763 cycles

DURING LINE CHECK MX FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROWS 14-18 OF THE CABIN WERE INOPERATIVE. MX REPAIRED THE WIRING AND FUNCTIONALLY CHECKED THE SYSTEM.

Part: BATTERY PACK — INOPERATIVE (EMERGENCY LIGHT) · airframe 75,495 hrs · 76,763 cycles

DURING LINE CHECK BOTH OF THE FORWARD OVERWING EMERGENCY EXIT SIGNS WERE FOUND TO BE INOPERATIVE. MX REPLACED THE BATTERY PACK AND THE LIGHTS RETURNED TO AN OPERATIONAL CONDITION.

Part: STIFFENER — CRACKED (FLOOR PANEL) · airframe 75,454 hrs · 76,726 cycles

DURING H CHECK FOUND CRACKS IN 2 STIFFENERS FOR FLOOR PANEL NR 28. REPAIRED PER EA 214491.

Part: FLOOR PANEL — CRACKED (FUSELAGE) · airframe 75,454 hrs · 76,726 cycles

DURING H CHECK FOUND CRACK ON THE EDGE OF FLOOR PANEL NR 18 AND 4 STIFFENERS. REPAIRED PER EA 98-213662.

Part: BATTERY PACK — DISCHARGED (CABIN) · airframe 75,088 hrs · 76,389 cycles

DURING LINE CHECK, MAINTENANCE FOUND THE EXTERIOR EMERGENCY FLOOD LIGHT WAS INOPERATIVE. MAINTENANCE REPLACED THE BATTERY PACK AND THE LIGHTS RETURNED TO AN OPERATIONAL CONDITION. (S)

Part: BATTERY PACK — INOPERATIVE (EMERGENCY LIGHT) · airframe 74,380 hrs · 75,759 cycles

DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY OVERWING EXIT SIGNS ON ROWS 11, 13, AND 14 WERE INOPERATIVE. THE POWER SUPPLY/BATTERY PACK WAS REPLACED AND SYSTEM CHECKS NORMAL.

Part: BATTERY PACK — INOPERATIVE (EMERGENCY LIGHTS) · airframe 74,190 hrs · 75,591 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: TIRE — SEPARATED (NR 1 MLG) · airframe 68,609 hrs · 70,645 cycles

THE OB LT MLG TIRE FAILED DURING LANDING. THE MISSING TREAD AND DEFLATED TIRE WAS REPORTED BY ANOTHER AIRCRAFT DURING TAXI TO THE GATE. TIRE TREAD SEPARATION DID CAUSE DAMAGE TO THE LANDING GEAR DOOR AND TO FLAP SURFACES. THERE WAS NO REORTED DAMAGE TO ANY POWER PLANT. TIRE ADN WHEEL ASSY FOR THE NR 1 AND NR 2 POSITIONS WERE REPLACED AND ALL EXTRANEOUS DAMAGE WAS REPAIRED. AIRCRAFT RETURNED TO SERVICE.

Part: CONTROLLER — MALFUNCTIONED (CABIN PRESSURE) · airframe 65,745 hrs · 67,957 cycles

AT FL330, THE RED CABIN PRESSURE ANNUNCIATOR LIGHT ILLUMINATED. CREW INITIATED AN EMERGENCY DESCENT TO 10,000 FT & REGAINED CONTROL OF CABIN PRESSURIZATION IN MANUAL MODE. FLT CONTINUED & LANDED WITHOUT INCIDENT AT MSY WHERE MAINTENANCE MEL'D THE AUTOMATIC PRESSURE CONTROLLER. AFTER THE AIRCRAFT ARRIVED BACK AT DTW, MAINTENANCE REPLACED THE CABIN PRESSURE CONTROLLER. NO MENTION OF BITE BEING PERFORMED OR NOT. AIRCRAFT RETURNED TO SERVICE.

Part: SENSE LINE — LOOSE · airframe 64,031 hrs · 66,466 cycles

Cabin continued to climb at approximate rate of 200-300 FPM after level at 35,000 feet. Crew initiated a rapid descent and performed COM procedures. Cabin pressure was controllable in manual mode at the lower altitudes. Flight diverted to MEM and landed without incident. Maintenance found a sense line for the right pack heat exchanger airflow disconnected and resecured it. Pack operation is normal and the aircraft has returned to service.

Part: BRACKET — CRACKED (FUSELAGE) · airframe 63,947 hrs · 66,371 cycles

DURING MCK IN ATL, CRACKS WERE FOUND ON THE LEFT AND RIGHT BRACKETS AT STATION 83 X=+-10. REPAIRED PER EA 98-190725.

Part: BULKHEAD — CRACKED · airframe 63,947 hrs · 66,371 cycles

During Mck in ATL, a crack was found in the flight compartment horizontal pressure panel at station 105. Repaired per EA 98-190706.

Part: PROXIMITY SWITCH — BROKEN (NLG) · airframe 61,904 hrs · 64,542 cycles

DURING APPROACH FOR LANDING AFTER GEAR SELECTED DOWN, RED NOSE GEAR UNSAFE LIGHT ILLUMINATED. FOLLOWED COM PROCEDURE WITH NO CHANGE IN STATUS. FLIGHT PERFORMED ONE GO-AROUND AND LANDED WITHOUT INCIDENT. REPLACED A BROKEN NOSE GEAR DOWNLOCK PROXIMITY SWITCH. OPERATIONAL CHECK OK.

Part: ACCUMULATOR — DISCHARGED (BRAKE SYSTEM) · airframe 61,372 hrs · 64,096 cycles

DURING DESCENT INTO DTW, THE LEFT BRAKE SYSTEM PRESSURE WENT TO ZERO PSI WITH LEFT HYDRAULIC SYSTEM PRESSURE 3000 PSI, QUANTITY WAS GOOD. COMPLIED WITH COM PROCEDURES WITH NO RESULTS. DECLARED AN EMERGENCY AND REQUESTED LONGEST RUNWAY AVAILABLE. LANDED UNEVENTFULLY WITH BRAKE SELECT IN BOTH. DURING BRAKE ACTION THE LEFT BRAKE PRESSURE RECOVERED TO 3000 PSI. MAINTENANCE FOUND LEFT BRAKE ACCUMULATOR FLAT. RESERVICED BRAKE ACCUMULATOR AND BLED BRAKES. OPERATIONAL CHECK OK.

Part: DOOR FRAME — CRACKED · airframe 61,190 hrs · 63,934 cycles

During L check at Dothan, found .071" thick aluminum doubler cracked at the upper FWD corner of entry door jamb. Fabricated repair doublers and installed per EA98-182679.

Part: DUCT — DIRTY (ANTI ICE SYSTEM)

DURING APPROACH INTO MKE, SLAT DISAGREEMENT LIGHT ILLUMINATED WITH ASSOCIATED ROLL TO THE LEFT ON SLAT EXTENSION. FLIGHT CREW DECLARED AN EMERGENCY AND LANDED USING FLAPS ONLY. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE CLEANED AND LUBRICATED ANTI-ICE TELESCOPE DUCTS. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.

Part: DUCT — BINDING (LE FLAP)

DURING APPROACH AT FSD UPON FLAP/SLAT EXTENSION, THE AIRCRAFT ROLLED LEFT AND THE SLAT DISAGREE LIGHT ILLUMINATED. THE SLATS WERE RETRACTED, AIRCRAFT CORRECTED, AND THE SLAT DISAGREE LIGHT EXTINGUISHED. FLIGHT CONTINUED TO FSD AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE LEFT SLAT T DUCT BINDING. T WAS LUBED AND CHECKED OK. 'T' WAS SUBSEQUENTLY REPLACED 16JAN00. OPERATIONAL CHECK OK.

Part: CONTROL BOX — FAILED (NLG)

DURING CLIMB-OUT FROM VPS, NOSE LANDING GEAR UNSAFE LIGHT REMAINED ON AFTER GEAR RETRACTION. FLIGHT WAS CONTINUED TO DESTINATION (MEM) WITH GEAR DOWN AND LANDED WITHOUT INCIDENT. CREW DECLARED AN EMERGENCY WITH ATC AS A PRECAUTION. MAINTENANCE REPLACED PROXIMITY CONTROL BOX AND NOSE GEAR UPLOCK SENSOR. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.

Part: ENGINE — FAILED (LEFT)

DURING TAKEOFF ROLL AT 60 KNOTS, THE LEFT ENGINE EPR AND N1 INDICATIONS BEGAN DECREASING. CREW ABORTED TAKEOFF AND RETURNED TO THE GATE. MAINTENANCE REPLACED THE LEFT ENGINE. OPERATIONAL CHECK OK. AIRCRAFT RETURNED TO SERVICE.

Part: BATTERY PACK — DISCHARGED (FLIGHT DECK)

PILOT REPORTED, THE EMERGENCY EXIT LIGHTING IN THE FLIGHT COMPARTMENT INOPERATIVE. MAINTENANCE RELAMPED THE FLIGHT DECK EMERGENCY EXIT LIGHT, REPLACED THE BATTERY PACK, OPERATIONAL CHECK OK.

Part: BATTERY — INOPERATIVE (BATTERY PACK)

DURING LINE CHECK, FOUND OVERHEAD EMERGENCY EXIT LIGHTS INOPERATIVE AT SEAT ROWS 5-9. MAINTENANCE REPLACED BATTERIES IN EMERGENCY EXIT LIGHT PACK. OPERATIONAL CHECK OK.

Part: BATTERIES — DISCHARGED (CABIN)

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

Part: BATTERIES — DISCHARGED (CABIN)

DURING PERIODIC CHECK, FOUND OVERHEAD EMERGENCY LIGHTS BETWEEN ROWS 7 THRU 9 INOPERATIVE. REPLACED BATTERIES, OPERATIONAL CHECK NORMAL.

Part: POWER SUPPLY — INOPERATIVE (RT NACELLE)

DURING LINE INSPECTION, FOUND THE EMERGENCY LIGHT ON THE RIGHT ENGINE NACELLE INOPERATIVE. MAINTENANCE REPLACED THE NACELLE POWER SUPPLY.

Part: STRUT — REQD SERVICE (NLG)

AFTER TAKEOFF, THE NOSE LANDING GEAR WOULD NOT RETRACT. PERFORMED COCKPIT OPERATING MANUAL PROCEDURE AND RECYCLED GEAR. GEAR WOULD NOT RETRACT. SLOWED AIRCRAFT TO APPROXIMATELY 180 KNOTS AND RECYCLED GEAR AGAIN. GEAR RETRACTED AND ALL INDICATIONS WERE NORMAL. FLIGHT CONTINUED TO MIA AND LANDED WITHOUT INCIDENT. MAINTENANCE SERVICED NOSE STRUT AND SWUNG GEAR SEVERAL TIMES, OPERATIONAL CHECK OK.

Part: FITTING — CORRODED (BS 975)

DURING L-CHECK, FOUND CORROSION ON CUSP FITTING FS 975 LEFT SIDE. REPLACED FITTING PER SRM 51-30-1 AND 51-30-5.

Part: FITTING — CORRODED (BS 965)

DURING L-CHECK, FOUND CORROSION ON CUSP FITTING FS 965 LEFT SIDE. REPLACED FITTING PER SRM 51-30-1 AND 51-30-5.

Part: BATTERIES — DISCHARGED (CABIN)

DURING LINE CHECK, FOUND EMERGENCY LIGHTS ABOVE THE AFT OVERWING EXITS INOPERATIVE. REPLACED BATTERIES. OPERATIONAL CHECK OK.

Part: FRAME — CRACKED (BS 1314)

DURING LINE CHECK, FOUND CRACK IN CANTED FRAME AT FS 1314, RIGHT LOWER SIDE. REPAIRED PER EA 98-112096.

Part: POWER SUPPLY — INOPERATIVE (CABIN)

DURING LINE CHECK, FOUND TAIL COMPARTMENT EMERGENCY ESCAPE/CATWALK LIGHTS INOPERATIVE. REPLACED POWER SUPPLY AND OPERATION CHECKS GOOD.

Part: BATTERY — DISCHARGED (TAILCONE)

DURING LINE CHECK, FOUND EMERGENCY SPOTLIGHT FOR INTERIOR TAILCONE DIM. REPLACED BATTERIES, OPERATION CHECKS GOOD.

Part: BATTERY — DISCHARGED (CABIN)

DURING LINE CHECK, FOUND ALL CATWALK PATHWAY LIGHTING INOPERATIVE. REPLACED BATTERIES AND OPERATION CHECKS GOOD.

Part: SUPPORT — CORRODED (BS 237-256)

DURING H-CHECK, FOUND CORROSION IN THE CENTER LINE FLOOR SUPPORT FROM FS 237 TO 256. REPAIRED SUPPORT (P/N 5910760-11) PER EA 98-111738.

Part: FITTING — CRACKED (BS 693)

DURING H-CHECK, FOUND A CRACK IN THE LONGERON 29L END FITTING AT FS 693. REPLACED FITTING PER SRM 51-30-5.

Part: BEAM — CRACKED (BS 47)

DURING H-CHECK, FOUND CRACKS IN THE FS 47 NOSE LANDING GEAR DOOR CUTOUT BEAMS AT THE LEFT AND RIGHT SIDES. REPAIRED BEAMS (P/N 9910088-107, -108) PER EA 98-111722.

Part: FLOORBEAM — CORRODED (BS 1136)

DURING H-CHECK, FOUND CORROSION IN THE FS 1136 FLOORBEAM CAP AT THE AIRCRAFT CENTER LINE. REPAIRED FLOORBEAM CAP (P/N 9912243-55) PER EA 98-111715.

Part: ANGLE — CRACKED (BS 1267)

DURING H-CHECK, FOUND A 1.5 INCH CRACK IN THE LEFT FUSELAGE TO VERTICAL STABILIZER ATTACH ANGLE AT FS 1267. REPAIRED ANGLE (P/N 5912141-59) PER EA 99-111716.

Part: FITTING — CRACKED (BS 1060-1068)

DURING H-CHECK, FOUND A CRACK IN THE RIGHT LONGERON 30 FLOOR SUPPORT FITTING BETWEEN FS 1060 TO 1068. REPLACED FITTING PER SRM 51-30-5.

Part: FITTING — CRACKED (BS 1167)

DURING H-CHECK, FOUND CRACKS IN BOTH THE LEFT AND RIGHT SIDE FS 1167 FLOOR BEAM TO FRAME FITTINGS. REPLACED FITTINGS PER SRM 51-30-5.

Part: DNLOCK SENSOR — MALFUNCTIONED (LT MLG)

DURING DESCENT ON GEAR EXTENSION, THE LEFT GEAR UNSAFE LIGHT CAME ON AND THE LEFT GEAR GREEN LIGHT WAS OUT. RECYCLED GEAR AND GOT NORMAL DOWN AND GREEN INDICATION. FLIGHT LANDED WITHOUT INCIDENT. PERFORMED TEST OF SYSTEM, REPLACED DOWN LOCK SENSOR AND OPERATIONAL CHECK OK.

Part: WIRE — BROKEN (CABIN)

DURING LINE CHECK, FOUND FIRST CLASS CEILING EMERGENCY LIGHTS INOPERATIVE. REPLACED POWER SUPPLY AND BATTERIES, FOUND BROKEN GROUND WIRE. REPAIRED GROUND WIRE AND OPERATIONAL CHECK GOOD.

Part: ENGINE — FAILED (NR 2)

NR 2 ENGINE FAILED ON CLIMBOUT. THE ENGINE WAS SHUTDOWN AND THE FLIGHT RETURNED MAKING AN UNEVENTFUL OVERWEIGHT LANDING IN DTW. MAINTENANCE REPLACED THE ENGINE WITH A SERVICEABLE UNIT.

Part: WIRE — CHAFED (TAKEOFF WARNING)

TAKEOFF WARNING HORN SOUNDED AS POWER LEVERS WERE ADVANCED FOR TAKEOFF. ABORTED TAKEOFF AND RETURNED TO GATE. REPAIRED CHAFED WIRE TO WARNING SYSTEM. OPERATIONAL CHECK NORMAL AND AIRCRAFT RETURNED TO SERVICE.

Part: BATTERY PACK — DISCHARGED (TAILCONE)

DURING LINE CHECK, FOUND TAILCONE OVERHEAD EMERGENCY LIGHT INOPERATIVE. ALSO, FOUND OVERHEAD AISLE LIGHTS ROWS 16-19 AND 23 INOPERATIVE. REPLACED BATTERIES FOR TAILCONE EMERGENCY LIGHTS. RESECURED BATTERIES AND REPLACED BULB FOR AISLE LIGHTS. OPERATIONAL CHECK GOOD.

Part: BATTERY PACK — DISCHARGED (CABIN)

DURING LINE CHECK, THE RIGHT EMERGENCY LIGHT WAS VERY DIM AND WOULD NOT EXTINGUISH. REPLACED THE BATTERY PACK, OPERATIONAL CHECK GOOD.

Part: DOOR — DAMAGED (NLG)

A LOUD BANG OCCURRED FROM NOSE LANDING GEAR AREA DURING GEAR RETRACTION AFTER TAKEOFF. RECYCLED GEAR WITH SAME RESULTS. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. FOUND LEFT NOSE GEAR DOOR BRACKET BENT AND DAMAGE TO DOOR. REPLACED LEFT NOSE GEAR DOOR. RIGGED AND CYCLED DOOR SEVERAL TIMES. OPERATIONAL CHECK OK. AIRCRAFT RETURNED TO SERVICE.

Part: HYDRAULIC VALVE — MALFUNCTIONED (NLG)

NOSE LANDING GEAR FAILED TO FULLY RETRACT AFTER TAKEOFF FROM TPA. RED UNSAFE LIGHT REMAINED ON AND NOISE LEVEL WAS CONSISTENT WITH GEAR BEING EXTENDED. NOSE GEAR RETRACTED NORMALLY WHEN HANDLE WAS MOVED TO 'UP' POSITION AFTER UPLATCH CHECK. FLIGHT CONTINUED TO DESTINATION (DTW) AND LANDED WITHOUT INCIDENT. REPLACED UPLOCK/DOWNLOCK HYDRAULIC CHECK VALVE DUE TO BYPASSING. CYCLED NOSE GEAR SEVERAL TIMES. OPERATIONAL CHECK OK. AIRCRAFT RETURNED TO SERVICE.

Part: DNLOCK SWITCH — MALFUNCTIONED (RT MLG)

RIGHT MAIN GEAR UNSAFE LIGHT ILLUMINATED IN FLIGHT. RECYCLED GEAR TWICE AND NORMAL INDICATIONS WERE ACHIEVED. FLIGHT CONTINUED TO DESTINATION (ATL) AND LANDED WITHOUT INCIDENT. REPLACED THE RIGHT MAIN GEAR DOWNLOCK SWITCH. OPERATIONAL CHECK OK. AIRCRAFT RETURNED TO SERVICE.

Part: SOCKET — SHORTED (COCKPIT PANEL)

DURING UPLATCH CHECK, GEAR DOOR OPEN LIGHT DID NOT ILLUMINATE. REPLACED BULB, THEN ALL THREE RED UNSAFE LIGHTS ILLUMINATED. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. NO GREEN LIGHTS ILLUMINATED DURING GEAR EXTENSION FOR LANDING. GEAR WAS VISUALLY CONFIRMED TO BE DOWN AND LOCKED THROUGH PERISCOPE. EMERGENCY EQUIPMENT WAS CALLED OUT AS A PRECAUTION. INSPECTED AND FOUND L2-265 SOCKET TO GEAR DOOR OPEN LIGHT SHORTED. REPLACED SOCKET, CIRCUIT BREAKER U-21 FOR GEAR PROXIMITY BOX, WHICH DID NOT TRIP. REPLACED PROXIMITY BOX. OPERATIONAL CHECK OK ON GEAR SWING. AIRCRAFT RETURNED TO SERVICE.

Part: RELEASE MECH — WORN (TAILCONE)

DURING PERIODIC CHECK, FOUND THAT EXCESSIVE FORCE WAS REQUIRED TO RELEASE THE TAILCONE. ALSO, FOUND A WORN CABLE SLIDER BLOCK AND LATCH LOCK ARM. REPLACED THE BLOCK AND ARM AND RERIGGED THE TAILCONE. CHECKED OK.

Part: FITTING — CORRODED (FS 636)

DURING PERIODIC CHECK, FOUND CORROSION ON FRAME SUPPORT FITTINGS FS 636 AT LONGERONS 29B LEFT AND RIGHT. REPLACED FITTING PER SRM 51-30-5.