N234NW

Part: PAN — CORRODED (AFT LAVATORY) · corrosion level 2 · airframe 118,912 hrs · 27,156 cycles

DURING M-CHECK FOUND CORROSION ON AFT LAVATORY PAN ASSEMBLY. REPAIRED PER EA 12-196591.

Part: LONGERON — CORRODED (BS 1631 - 1691) · corrosion level 2 · airframe 73,824 hrs · 16,647 cycles

DURING H-CHECK, FOUND CORROSION ON LONGERON 44R FROM BS 1631 TO BS 1691. REPAIRED PER EA12-173342.

Part: FLOORBEAM — CRACKED (FUSELAGE) · airframe 73,824 hrs · 16,647 cycles

DURING H-CHECK, FOUND CRACK ON FLOORBEAM AT BS 1099 LBL 58. REPAIRED PER EA 12-174996.

Part: DUCT — CRACKED (NR 1 ENGINE)

DURING TAKEOFF ROLL, THE NR 1 ENGINE FIRE WARNING ILLUMINATED. THE TAKEOFF WAS ABORTED AT 120 KNOTS AND THE AIRCRAFT RETURNED TO THE GATE. MAINTENANCE FOUND A 14TH STAGE BLEED AIR DUCT CRACKED. THE DUCT WAS REPLACED AND ENGINE RUN AT HIGH POWER WAS NORMAL.

Part: DUCT — DAMAGED (NR 1 ENGINE)

ON INITIAL CLIMB-OUT (BOM), THE NR 1 ENGINE FIRE WARNING LOOP A LIGHT ILLUMINATED. THREE MINUTES LATER THE NR 1 ENGINE FIRE WARNING LOOP B LIGHT ALSO ILLUMINATED. POWER WAS REDUCED TO 60 PERCENT ON THE NR 1 ENGINE AND BOTH INDICATIONS EXTINGUISHED. ALL OTHER ENGINE PARAMETERS WERE NORMAL. FUEL WAS DUMPED AND THE AIRCRAFT RETURNED TO BOM. MAINTENANCE INSPECTED THE ENGINE AND FOUND TWO COMPRESSOR BLEED DUCTS HAD BECOME SEPARATED AT A THREADED CONNECTION. ONE DUCT WAS REPLACED AND THE FOLLOW-UP ENGINE RUN AT FULL POWER WAS NORMAL. THE AIRCRAFT RETURNED TO SERVICE.

Part: AIRSPEED IND — INOPERATIVE (RT COCKPIT)

DURING CLIMB, THE FIRST OFFICER'S AIRPSEED INDICATOR WENT TO 0. AIRCRAFT RETURNED TO SEA AND LANDED WITHOUT INCIDENT. REPLACED THE FIRST OFFICER'S AIRSPEED INDICATOR. OPERATIONAL CHECK OK.

Part: AIRSPEED IND — INOPERATIVE (RT FLIGHT DECK)

DURING CLIMB, THE FIRST OFFICER'S AIRSPEED INDICATOR WENT TO ZERO. AIRCRAFT RETURNED TO SEA AND LANDED WITHOUT INCIDENT. REPLACED THE FIRST OFFICER'S AIRSPEED INDICATOR, OPERATIONAL CHECK GOOD.

Part: DUCT — CRACKED (NR 1 ENGINE)

DURING CLIMB TO FL390, THE NR 1 ENGINE NACELLE TEMPERATURES WERE VERY HIGH AND THE NACELLE LOOP A LIGHT ILLUMINATED. CREW FOLLOWED COM ABNORMAL PROCEDURES AND DESCENDED TO FL350 TO KEEP TEMPERATURES WITHIN LIMITS. FLIGHT CONTINUED WITHOUT FURTHER PROBLEMS. MAINTENANCE INSPECTED ENGINE AND FOUND COMPRESSOR DISCHARGE DUCT CRACKED. DUCT WAS REPLACED AND LEAK CHECKED. THE AIRCRAFT RETURNED TO SERVICE.

Part: LONGERON — CORRODED (BS 1975)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 43R AT FS 1975. REPAIRED PER EA 12-150971.

Part: LONGERON — CORRODED (BS 1501-1521)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 31R, FS 1501 TO 1521. REPAIRED PER EA 12-150970.

Part: SKIN — CORRODED (BS 1139)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON SKIN JUST AFT OF FS 1139 LONGERON 48R TO 51L. REPAIRED PER EA 12-150949.

Part: FRAME — CORRODED (BS 1821)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON FRAME AT FS 1821 LONGERON 45L. REPAIRED PER EA 12-150955.

Part: FITTING — CORRODED (BS 1986 2007)

DURING M CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 45R END FITTING FS 1986-2007. REPLACED END FITTING PER SRM 51-21-01 AND 51-33-01, VOL II.

Part: FITTING — CORRODED (BS 1975)

DURING M CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 47R END FITTING FS 1975. REPLACED END FITTING PER SRM 51-21-01 AND 51-35-01, VOL II.

Part: LONGERON — CORRODED (BS 1964)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 45R, FS 1964. REPAIRED PER EA 12-150975.

Part: FITTING — CORRODED (BS 1997-2007)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 46L SPLICE FITTING, FS 1997 TO 2007. REPLACED FITTING PER SRM 51-21-02 AND 51-33-01, VOL 2.

Part: FITTING — CRACKED (BS 1854)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CRACKED LONGERON 49R END FITTING FS 1854. REPLACED END FITTING PER SRM 51-33-01, VOL II.

Part: FITTING — CORRODED (BS 1986-2007)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 50R END FITTING FS 1986 TO 2007. REPLACED END FITTING PER SRM 51-31-01, VOL II.

Part: FITTING — CORRODED (BS 1997-2003)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 52 END FITTING AT FS 1997 TO 2003. REPLACED FITTING PER SRM 51-21-01 AND 51-33-02, VOL II.

Part: FITTING — CORRODED (BS 1997-2003)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 51R END FITTING AT FS 1997 TO 2003. REPLACED FITTING PER SRM 51-33-01 AND 51-21-01, VOL II.

Part: FITTING — CORRODED (BS 1997-2007)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 47L END FITTING AT FS 1997 TO 2007. REPLACED FITTING PER SRM 51-21-01 AND 51-33-02, VOL II.

Part: FITTING — CORRODED (BS 1997-2007)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 44L END FITTING AT FS 1997 TO 2007. REPLACED FITTING PER SRM 51-21-01 AND 51-33-01, VOL II.

Part: FITTING — CORRODED (BS 1997-2007)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 45L END FITTING AT FS 2007. REPLACED FITTING PER SRM 51-21-01 AND 51-33-01, VOL II.

Part: FITTING — CORRODED (BS 1975-2007)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 51L END FITTING AT FS 1975 TO 2007. REPLACED FITTING PER SRM 51-21-01 AND 51-33-01, VOL II.

Part: FITTING — CORRODED (BS 1997-2003)

DURING M-CHECK AND PRIOR TO SERVICE, FOUND CORROSION ON LONGERON 43L END FITTING AT FS 1997 TO 2003. REPLACED FITTING PER SRM 51-33-01 AND 51-21-01, VOL II.