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Printed page 13. PDF page 27.
Investigation Report AIR-25-04 corresponding stop fittings on the fuselage frame and prevent the plug from moving outboard. Each plug stop fitting has a stop pin that abuts the face of the stop pad on each corresponding fuselage frame stop fitting.Open official document at PDF page 27NTSB AIR-25-04: In-Flight Separation of Left Mid Exit Door Plug, Alaska Airlines Flight 1282
Printed page 84. PDF page 98.
two upper guide track bolts (with the vertical movement arrestor bolts missing) would prevent the plug from moving upward the distance needed for the stop pins to clear the stop pads. However, none of the four bolts were present inOpen official document at PDF page 98NTSB AIR-25-04: In-Flight Separation of Left Mid Exit Door Plug, Alaska Airlines Flight 1282
Printed page x. PDF page 10.
Transportation Safety Board found that the four bolts that secured the left MED plug to prevent it from moving upward vertically were missing before the newly manufactured airplane was delivered to Alaska Airlines. As a result, the left MED plugOpen official document at PDF page 10NTSB AIR-25-04: In-Flight Separation of Left Mid Exit Door Plug, Alaska Airlines Flight 1282
Printed page 75. PDF page 89.
engineering design) to develop a design enhancement to add two secondary retention devices to prevent an MED plug from moving upward in the event that the vertical movement arrestor bolts and upper guide track bolts were not installed. The retentionOpen official document at PDF page 89NTSB AIR-25-04: In-Flight Separation of Left Mid Exit Door Plug, Alaska Airlines Flight 1282
Printed page 92. PDF page 106.
plug installations. The design enhancement would add two secondary retention devices to prevent an MED plug from moving upward if the vertical movement arrestor bolts and upper guide track bolts were not installed, prevent the sidewall panels from being installedOpen official document at PDF page 106NTSB AIR-25-04: In-Flight Separation of Left Mid Exit Door Plug, Alaska Airlines Flight 1282