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Printed page x. PDF page 10.
evidence this upward displacement was associated with previous pressurization system AUTO FAIL light illumination events. We determined that, when the airplane was manufactured, Boeing personnel had opened the left MED plug (which inherently required removing the four bOpen official document at PDF page 10NTSB AIR-25-04: In-Flight Separation of Left Mid Exit Door Plug, Alaska Airlines Flight 1282
Printed page 11. PDF page 25.
maintenance log books for the airplane documented the illumination of the cabin pressurization AUTO FAIL light during flights on December 7, 2023; January 3, 2024; and January 4, 2024.19 The records documented the maintenance 18 An emergency exit door installedOpen official document at PDF page 25NTSB AIR-25-04: In-Flight Separation of Left Mid Exit Door Plug, Alaska Airlines Flight 1282
Printed page 12. PDF page 26.
extended range operations so that it would remain near maintenance bases should another AUTO FAIL light illumination event occur.21 See section 1.10.2 for information about the NTSB's examination of the accident airplane's cabin pressurization system, including the previouOpen official document at PDF page 26NTSB AIR-25-04: In-Flight Separation of Left Mid Exit Door Plug, Alaska Airlines Flight 1282
Printed page 18. PDF page 32.
between 9,000 and 11,000 ft.) Also, as discussed in section 1.5.1, a cabin pressure AUTO FAIL light will illuminate to alert the flight crew of certain anomalous conditions involving the cabin pressure control system, such as the failure of aOpen official document at PDF page 32NTSB AIR-25-04: In-Flight Separation of Left Mid Exit Door Plug, Alaska Airlines Flight 1282
Printed page 33. PDF page 47.
flights, including those for which Alaska Airlines' maintenance records documented that the AUTO FAIL light had illuminated. (The AUTO FAIL light will illuminate to alert the flight crew of certain anomalous conditions involving the cabin pressure control system, such asOpen official document at PDF page 47NTSB AIR-25-04: In-Flight Separation of Left Mid Exit Door Plug, Alaska Airlines Flight 1282
Printed page 34. PDF page 48.
expected for a rapid depressurization event occurring above 10,000 ft). 1.10.2.2 Previous AUTO FAIL Light Illumination Events As stated in section 1.5.1, Alaska Airlines' maintenance records for the accident airplane documented that the AUTO FAIL light had illuminated duringOpen official document at PDF page 48NTSB AIR-25-04: In-Flight Separation of Left Mid Exit Door Plug, Alaska Airlines Flight 1282