N977AK
Registered owner: ALASKA AIRLINES INC, WA (owner ≠ operator)
Operators of this aircraft
Who operated this tail, and how firmly we know it.
No operator established for this aircraft.
Accident & incident history
No NTSB accidents or incidents on file for this aircraft.
Maintenance disclosures
ROW 16DEF "EXIT/SALIDA" PLACARD HAS DIRECTION ARROW FACING THE WRONG WAY AWAY FROM EMERGENCY EXIT. GROUNDED - YES. REPLACED EXIT LENS FLOOR COVER ROW 16DEF PER AMM 33-51-01.
FUSELAGE INTERIOR, COCKPIT, PILOT AND FIRST OFFICERS INBD AFT SEAT TRACK LOCK PIN HOLES ARE OUT OF LIMITS. GROUNDED - YES. R & R THE SEAT TRACKS (2EA) AFT INBD OF THE PILOT AND FIRST OFFICERS SEATS AT COCKPIT IAW CMM 25-11-39, AMM 25-11-01-400-801, 25-11-01-400-801, AND 20-50-11-910-801.
FUSELAGE INTERIOR, COCKPIT, PILOT AND FIRST OFFICERS INBD AFT SEAT TRACK LOCK PIN HOLES ARE OUT OF LIMITS. GROUNDED - YES. R & R THE SEAT TRACKS (2EA) AFT INBD OF THE PILOT AND FIRST OFFICERS SEATS AT COCKPIT IAW CMM 25-11-39, AMM 25-11-01-400-801, 25-11-01-400-801 AND 20-50-11-910-801.
EXTERIOR FUSELAGE, LIGHTNING STRIKE FOUND AT STA 500E BETWEEN S-5L AND S-6L. GROUNDED - YES. ACCOMPLISHED REPAIR PER ASA EA M9-53EA-28524 REV 00. THIS IS A CATEGORY B REPAIR. DTI DUE WITHIN 24MTHS FROM 12APR2025.
GE DIAGNOSTICS REPORTS THE #2 ENGINE IS GENERATING ALERTS FOR PS3 OUT OF RANGE, PS3 PRESSURE DISAGREE FAULT, P3B OUT OF RANGE, P3B PRESSURE DISAGREE FAULT, OR P3B VS PS3 PRESSURE DISAGREE FAULT. (TASK CARD 73-ASA-01)(#PRI 1) CNR # 20231108022ETOPS SIGNIFICANT SYSTEM. GROUNDED - YES. (RESOLVED ON W/O: 1974685 TASKCARD: N/R-00001 ) ACCOMPLISHED TASK CARD 73-ASA-01 FOR #2 ENG BLOWOUT. OPS CHECK GOOD. THIS CLEARS TSR715226. SEAMC DAVE NOTIFIED.
#2 ENGINE CONTROL LIGHT ILLUMINATED AFTER TOUCHDOWN. GROUNDED - YES. ENG 2 CONTROL STATUS MSG FOUND ACTIVE, PER IFIM TASK G73-20-00-810-858 FOUND 2 NON ACTIVE FAULTS. MX MSG 73-43304 COMPRESSOR DISCHARGE PRESSURE (PS3) SENSOR IS OUT OF RANGE DETECTED BY ENG-2 EEC CHANNEL-B AND 73-43303 COMPRESSOR DISCHARGE PRESSURE (PS3) SENSOR IS OUT OF RANGE DETECTED BY ENG-2 CHANNEL-A. PER IFIM TASK G73-21-00-810-892, COMPLETED T/C 73-ASA-01 ENG 2 PRESSURE SUB SYSTEM AND SENSE LINE DRY OUT. STEPS 1.A-D. N.HEASLETT 40055. ACCOMPLISHED ENG #2 IDLE SYS TEST NO. 32, TEST PASSES & NO ENG CTRL LIGHT & NO ACTIVE FAULTS.
REFER TC 31-005-00 SMT MESSAGE BLEED FAMV RVDT R WITH ASSOCIATED CORRELATED MAINTENANCE MESSAGE 36-12031 ENGINE -2 FAMV RVDT SIGNAL IS OUT OF RANGE. GROUNDED - YES. (RESOLVED ON W/O: 1972725 TASKCARD: N/R-00002 ) THE RESISTANCE READINGS FOR ALL FIVE CONNECTIONS CALLED OUT IN THE IFIM 36-12-00-810-804 WERE GOOD. VISUAL INSPECTIONS WERE GOOD. WAS UNABLE TO REMOVED FILTER FOR INSPECTION. REMOVED AND REPLACED FAN AIR MODULATING VALVE ASSY IAW AMM 36-12-03-000-801 AND AMM 36-12-03-400-801. ETOPS GROUND FUNCTIONAL CHECKS GOOD IAW AMM ELECTICAL LRU REPLACEMENT TEST TASK 36-00-00-710-801, AND PNEUMATIC ENGINE ON -SYSTEM TEST TASK 36-00-00-730-801. FAN COWL AND T/R'S WERE OPENED AND CLOSED DURING MAINTENANCE IAW AMM 71-11-04 AND AMM 78-31-00, ALTERNATE DEACTIVATION PROCEDURES WERE USED DURING MAINTENANCE IAW MPM CH 5, 5-07-01, TABLE 3. AIRCRAFT RESTORED TO NORMAL AFTER MAINTENANCE. CLEARS PLT, SEAMC DAVE NOTIFIED.
#2 ENGINE HIGH PRESSURE SHUTOFF VALVE LOCKOUT INOP (HEILCOIL DAMAGE). GROUNDED - YES. CW EA MAX-36EA-25932 MAX HIGH PRESSURE SHUTOFF VALVE MANUAL LOCK HELICOIL INSERT INSHOP REPAIR. OK FOR SERVICE.
F/C APPROACH SURVEY AUTOLAND NOT SUCCESSFUL. GROUNDED - YES. ON DEFERRAL.
AFTER STARTING ENG NBR 1 WITH AIR CART NBR 1 ENG ANTI-ICE LIGHT ILLUMINATED. GROUNDED - YES. REF LOG PAGE 60841435 FOR CORRECTIVE ACTION. AFTER BLEED FAULT TROUBLESHOOTING ANTI ICE FAULT CLEARED. UPON OMF QUERY NOTICED HPSOV ON STATUS PAGE. ACCOMPLISHED EXISTING FAULTS FOUND FAULT CODES 36-00180, 36-11020, 36-12030 AND 36-00051. ACCOMPLISHED IFIM 36-11-00-810-802. ACCOMPLISHED PNEUMATIC ENG ON SYS TEST. PER AMM 36-00-00-730-801. ALL FAULTS CLEARED. BLEED LIGHT MAINT LIGHT AND ANTI ICE LIGHTS EXTINGUISHED A/C OK FOR SERVICE SEAMOC STEVE NOTIFIED
AFTER CROSS BLEED START ENG NBR 2 NBR 1 BLEED LIGHT ILLUMINATED. AT THE GATE AFTER SHUTDOWN MAINT LIGHT ILLUMINATED. GROUNDED - YES. UPON OMF QUERY NOTIED HPSOV ON STATUS PAGE. ACCOMPLISHED EXISTING FAULTS FOUND FAULT CODES 36-00180, 36-11020, 36-12030 AND 36-00051. ACCOMPLISHED IFIM 36-11-00-810-802. ACCOMPLISHED PNEUMATIC ENG ON SYS TEST. PER AMM 36-00-00-730-801. ALL FAULTS CLEARED. BLEED LIGHT MAINT LIGHT AND ANTI ICE LIGHTS EXTIGUSHED A/C OK FOR SERVICE SEAMOC STEVE NOTIFIED.
GE DIAGNOSTICS REPORTS THE #2 ENGINE IS GENERATING ALERTS FOR PS3 OUT OF RANGE, PS3 PRESSURE DISAGREE FAULT, P3B OUT OF RANGE, P3B PRESSURE DISAGREE FAULT, OR P3B VS PS3 PRESSURE DISAGREE FAULT. GROUNDED - YES. REMOVED AND REPLACED PSS REF AMM 73-21-11, OPS CHECKS GOOD.
WHILE ACCOMPLISHING T/C 35-005-00 FOUND #1 ENG FAULT CODE 36-12030 FAMV RVDT SIGNAL IS OUT OF RANGE. GROUNDED - YES. ON DEFERRAL.
WHILE ACCOMPLISHING T/C 31-005-00 FOUND FAULT CODE 36-00051 DUAL BLEED STATUS SIGNAL FROM ACAU-R DOES NOT AGREE WITH INTERNAL DUAL BLEED DETERMINATION LOGIC. GROUNDED - YES. ON DEFERRAL.
WITH APU PRESSURIZING PACKS, DUCT PRESSURE FLUCTUATES FROM 10 TO 35 PSI. GROUNDED - YES. ACCOMPLISHED ENG NORMAL START REF AMM 71-00-00 WITH APU BLEED AIR WITH NO FLUCTUATION NOTED APU OPS NORMAL THIS CLEAR MEL 49-52-01B SEA MOC NOTIFIED PLACARDS REMOVED.
AMBER MAINT LIGHT ON OVERHEAD PANEL DOING PREFLIGHT. GROUNDED - YES. FOUND BOTH EEC FOR ENGINE 1 AND 2 IN TEST MODE FOLLOWED IFIM G77-00-00810-941, AND TASK G73-20-00-810-936. SET BOTH EECS TO NORM, CLEARED LATCHED FAULS, OPS CHECK GOOD.
WHILE PERFORMING T/C 31-005-00, FOUND ENG 2 EEC C1 MESSAGE WITH ASSOCIATED MAINTENANCE MESSAGE 73-43303 AND 73-43293. " COMPRESSOR DISCHARGE PRESSURE (PS3) SENSOR CHANNEL-A CHANNEL-B SIGNALS DO NOT AGREE. GROUNDED - YES. ON DEFERRAL.
GE DIAGNOSTICS REPORTS THE #2 ENGINE IS GENERATING ALERTS FOR PS3 OUT OF RANGE, PS3 PRESSURE DISAGREE FAULT, P3B OUT OF RANGE, P3B PRESSURE DISAGREE FAULT, OR P3B VS PS3 PRESSURE DISAGREE FAULT. (TASK CARD 73-ASA-01)-----#PRI1/ETOPS----- CNR # 20230716004*****ETOPS SIGNIFICANT SYSTEM*****. GROUNDED - YES. ACCOMPLISHED #2 ENGINE PRESSURE SUB SYSTEM, PS3 & P3B SENSE LINES MOISTURE DRY OUT PER TC 73-ASA-01 ON #2 ENG.
#1 ENGINE IS ALERTING FOR OIL FILTER DELTA PRESSURE INCREASE AND APPROACHING OIL FILTER BYPASS INDICATION. (#PRI1) CNR 20230626065DO NOT EXTEND. GROUNDED - YES. ACCOMPLISHED TSR STEPS 1 THRU 4.NO OMF MX MSG NOTED, NO DEFECTS OR CONTAMINATIONS NOTED ON OIL FILTER CARTRIDGEINSTALLED NEW OIL FILTER CARTRIDGE REF MM 79-21-07.
APU FAULT AND SHUTDOWN ON GROUND AFTER LANDING. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM TASK 49-40-00-810-818 STEPS A.-C.(5)(C) AND IFIM TASK 49-40-00-810-805 STEPS A.-C.(5)(C). NO DEBRIS ON MAGNETIC PLUG, APU ROTATES FREELY, WIRING CHECK OK. REPLACED STARTER GENERATOR UNIT. OPS/LEAK CHECK OK. REF. B737-9 AMM 49-41-21-400-8011.
AUX PITOT LIGHT ON OVERHEAD PANEL ILLUMINATED ON APPROACH. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM 30-31-00-810-804 AUX PITOT LIGHT EXTINGUISHED. OPERATION AUX PITOT NORMAL.
ATTEMPTED TO START ENGINE #2. #2 ENGINE FAILED TO START RIGHT IGNITION WAS SELECTED. GROUNDED - YES. REPLACED BOTH RIGHT AND LEFT IGNITERS. REF B737-9 AMM 74-21-02.
ON DEPARTURE CAPTAINS #2 OVERHEAT WINDOW LIGHT CAME ON. GROUNDED - YES. PERFORMED B737-9 IFIM TASK 30-41-00-810-830. CAPTAIN'S SIDE WINDOW OPS CK NORMAL. REF B737-9 AMM TASK 30-41-00-710-801.WAS AN INTERMITTENT FAULT. OK FOR SERVICE.NO HISTORY 30 DAYS.
ON LANDING AUX PITOT LIGHT CAME ON. GROUNDED - YES. PERFORMED RESET PROCEDURE PER B737-9 IFIM TASK 30-31-00-810-804 OPS CHECKS NORMAL.
TECH SERVICES REQUEST FOLLOW-UP TO HISTORY OF #1 (LEFT) FMC FAILED AND REBOOTING. REPLACE LEFT FMC. GROUNDED - YES. REMOVED AND REPLACED #1 (LEFT) FMC REF B737-9 AMM 34-61-02. OPS CHECK GOOD. NO FAULTS NOTED.
AT CRUISE FL 340 FMC DID A RESTART. VTK ON CA ND AND BOTH FMC'S WENT TO MENU PAGE. A/T LIMIT LIGHT ILLUMINATED. FMC'S RETURNED TO NORMAL AFTER 15 SEC. GROUNDED - YES. PERFORMED FMC OPERATIONAL TEST. FMC LEFT AND RIGHT AND L AND R DPC TEST OK IAW B737-9 AMM TASK 34-61-00-710-801. PERFORMED AUTOTHROTTLE OPS TEST. TEST NORMAL IAW AMM TASK 22-31-00-710-801. NO FLIGHT DECK EFFECTS FOR VTAK IAW B737-9 IFIM TASK 31-00-00-810-803.
WHILE IN CRUISE @ FL340 VTK ON CAPTAINS ND ILLUMINATED FOLLOWED BY BOTH MCDU'S GOING BLANK (MENU) WITH A/T LIM ANNUNCIATION. CAPTAINS MAGENTA LINE ALSO DISAPPEARED ON CAPTAINS ND. ALL SYSTEMS RESTORED WITHIN 15 SECONDS BEFORE QRH COULD BE ACCOMPLISHED. GROUNDED - YES. INBOUND FLT LOGGED NO FMC-1 INPUT FAULT 34-69001 PERFORMED B737-9 IFIM TASK 34-61-00-810-836 AND NO CURRENT FAULTS FOR L/H FMC GROUND VERIFICATION CK OF L/H FMC PASSED REF B737-9 AMM 34-61-00/710-801.
FO NAV DISPLAY MAGEHTA ROUTE DATA INCORRECT AND WOULD NOT DISPLAY FMC DATA. MCP DATA DISPLAYED ON FO NAV DISPLAY. CA NAV DISPLAY CORRECT. NO FMC WARNINGS OR CAUTIONS. GROUNDED - YES. RELOAD FMC DATA PER B737-9 AMM 34-61-00-470-002.
FMC DISAGREE ON GROUND, QRH PROCEDURE RESOLVED. OPS GOOD. GROUNDED - YES. PERFORMED B737-9 IFIM 34-61-00-810-918 AND FAULT MSG REMAINED EXTINGUISHED.
FOUND CRACK ON #1 ENGINE SURFACE AIR OIL COOLER LH. GROUNDED - YES. REMOVED AND REPLACED #1 ENG SACOC REF B737-9 AMM 79-21-02.
LEFT WING ANTI ICE VALVE WOULD NOT OPEN WHEN TURNED ON LEFT VALVE CAUTION LIGHT ANT ANTI ICE VALVE MASTER CAUTION ILLUMINATED WHEN POSITION ON. GROUNDED - YES. REMOVED & REPLACED LH WING ANTI-ICE VALVE REF B737-9 AMM 30-11-11/401. OPS CHECK PASS.
WHILE PERFORMING ASA T.C. #05-020-01, #1 ENG HAS SMT MTX MSG PRESENT "ENG 1 EEC C2", WITH CORRELATED MTX MSG 73-44632: FAN SPEED (N1) SENSOR LOW TOOTH SIGNAL IS INVALID, IN FAULT HISTORY. GROUNDED - YES. REPLACED N1 SENSOR, REF B737-9 AMM 77-12-01-401.
WHEN SELECTING WING ANTI-ICE, THE LEFT WING ANTI-ICE VALVE AMBER LIGHT REMAINED ILLUMINATED AND THERE WAS A 15 PSI DUCT SPLIT. GROUNDED - YES. REMOVED AND REPLACED LH WING ANTI-ICE VALVE REF B737-9 AMM 30-11-11 OPS CHK GOOD. GROUND VERIFICATION SUCCESSFUL. ORIG SUBMISSION DATE: 10/31/2022
DURING DESCENT WITH ANTI ICE ON, L VALVE AMBER LIGHT REMAINED ILLUMINATED. GROUNDED - YES. INTERROGATED FAULT HISTORY. FOUND NO FAULTS. PREFORMED B737-9 FIM TASK 30-11-00-810-808 FOR WING ANTI-ICE STAYS ON AFTER TRANSITION. VALVE AND PANEL OPERATIONAL CHECK GOOD. TRANSITORY FAULT.
ON DESCENT WITH A TAT OF -3 WING WING ANTI-ICE WAS TURNED ON AND THE L VALVE CAUTION LIGHT REMAINED ILLUMINATED. CHECKLIST DIRECTED TO TURN OFF WING ANTI-ICE AND CAUTION LIGHT EXTINGUISHED. GROUNDED - YES. PREFORMED OPS CHECK REF B737-9 AMM 30-11-11-710-801 NO DEFECTS NOTED.
EMERGENCY EXIT LIGHTS "NOT ARMED" INDICATOR INOP. GROUNDED - YES. RELAMPED NO HELP. REPLACED L-1 "NOT ARMED" LIGHT ASSEMBLY AND SOCKET, NO HELP. PULLING C/B 96-3 D11 MASTER DIM/TEST CONT. WILL TURN ON LIGHT. REPLACED DIODE M208 REF B737-9 WDM 33-18-11 SH2. NO HELP. REPLACED "NOT ARMED" LIGHT ASSY PN : 318-630-1002-010 IAW WDM 33-51-11. NO HELP. WITH LI SOCKET REMOVED, TERMINAL#2 GROUND READS 1.6M TO TB505. REF. WDM 33-18-37 PG. 4.1 SHT 1, VERIFIED L1 "NOT ARMED" ANN. ASSY CORRECTLY WIRED. DID FIND AT TB505, WIRES 5578-20 &5579-20 SWAPPED AT TERMINAL BLOCK YB9 AND YA9. SWAPPED WIRES TO CORRECT TERMINAL BLK POSITIONS, EMERGENCY EXIT LIGHT "NOT ARMED" ANN. OPS CHK GOOD REF. B737-9 AMM 33-51-00.
FMC DISAGREE ON BOTH NDS. GROUNDED - YES. FAULT RESET AND CLEARED REF B737-9 IFIM TASK 34-61-00-810-919.
TROUBLESHOOTING RECOMMENDATIONS FOR #1 ENGINE MAIN FUEL/OIL HEAT EXCHANGER FAULT. GROUNDED - YES. REMOVED AND REPLACED #1 ENG MAIN FUEL/OIL HEAT EXCHANGER DIFFERENTIAL PRESSURE SENSOR REF B737-9 AMM TASKS 73-11-12-000-801-G00/-400-801-G00. OPS CHECK GOOD.
#1 ENG FILTER BYPASS LIGHT ON DEPARTURE. GROUNDED - YES. REMOVED AND REPLACED #1 ENG MAIN FUEL/OIL HEAT EXCHANGER DIFFERENTIAL PRESS SWITCH. REF B737-9 AMM 73-11-12-000-801-G00/-400-801-G00.
DURING INSPECTION OF #1 ENGINE FUEL METERING UNIT FOUND DAMAGE DURING REMOVAL OF FMU SOLENOID JUST FWRD OF SB2 STRAIN REF ASA L/P 60220674 REQ P/N 8062-1155. GROUNDED - YES. REPLACED FUEL METERING UNIT REF B737-9 AMM 73-21-04-400-801 STEPS A-H OPERATIONAL TEST AND LEAK CHECK REQUIRED. LEAK CK OF MAIN FUEL PUMP DRAIN PLUG. COMPLETED INSTALL OF FUEL METERING UNIT REF AMM 73-21-04-400-801-G00 STEPS I-J OPS LEAK CHECK GOOD.