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The device from Friday’s flight automatically recorded over the pertinent voice data because someone failed to power it down, she said. It starts a fresh recording, wiping out the last one, every two hours.

“The circuit breaker was not pulled,” Homendy said.

‘They heard a bang’

She described chaos and communication issues on board the Boeing 737 Max 9 as flight crew reported hearing a loud noise and the cabin rapidly depressurized Friday evening over the Portland area.

“They heard a bang,” she said.

The plane’s first officer lost her headset in the depressurization, and the captain had headset problems, as well, Homendy said. So they turned on a speaker for communication, she said.

“Communication was a serious issue,” Homendy said.

At the same time, the cockpit door opened violently, and a laminated checklist pilots use in an emergency situation flew out, the chair said.

“It did blew open during the explosive decompression,” Homendy said of the cockpit door.

The pilots turned to another quick reference guide, a handbook, she said, as a flight attendant took three tries to shut the cockpit door.

“The actions of the flight crew were really incredible,” Homendy said. “It was very violent when the door was expelled out of the plane. There was a lot going on.”

Homendy described some of the damage inside the plane. It included two seats, unoccupied by chance, that sustained such violent force that their frames had “torqued.”

Both seats in row 26 were missing their headrests, and one was missing a seat back. In all, damage was found along 12 of the plane’s seat rows, she said.

She expressed concern over three babies who were held in the laps of their caregivers. The NTSB, the Federal Aviation Administration and Alaska Airlines all recommend, but don’t require, that young children travel in car seats secured in separate, ticketed seats.

The FAA has ordered some Boeing 737 Max 9 airplanes, the model flown in the Alaska Airlines incident, to be grounded and issued a directive requiring inspections before certain aircraft can fly again. The new directive affects 171 planes worldwide.

When the FAA sent out its airworthiness directive, it is followed by a multi-operator message (MOM) from the manufacturer, in this case Boeing. The document is very specific on what the airline must do to accomplish the process for inspection. 

Boeing typically works with the airlines and the FAA to finalize its inspection process, which ultimately must satisfy the FAA.  Boeing shares their progress with the FAA as the instructions are drafted and when it’s final, it’s submitted for final approval. Once approved, the airlines will follow the memo to inspect the grounded 737-9 aircraft, a process that the FAA said could take between four and eight hours.

A source familiar with the process said finalizing the MOM is a deliberate process and can’t be rushed before it is submitted for approval by the FAA.

Earlier Sunday, Homendy spoke to NBC News about the task ahead for NTSB investigators and said the “stakes are high.”

Analyzing the door plug

Investigators are looking at how the door plug — a panel where an optional emergency exit can be placed depending on passenger capacity — was fastened before it blew out of the plane, Homendy said during Sunday night’s news conference.

They also want to know more about air pressurization alerts that went off on the plane during flights on Dec. 7 and on Wednesday and Thursday, the latter being the days before the accident.

She said the airline prohibited the aircraft from embarking on long flights over water — specifically from traveling to Hawaii — until the issue could be checked out more thoroughly. By Friday night’s flight from Portland to Ontario, California, that inspection hadn’t been completed, Homendy said.

She said the issue had been described to the NTSB has “benign” and that it was unclear whether there was any correlation between those alerts and Friday’s accident.

Homendy said investigators were focused in part on how the door plug was fastened and whether there were failures related to it, although she said the structural integrity of the aircraft was intact following the accident.

She described two hinges at the bottom of the plug that allow a small degree of opening for routine inspections as well as four “stop fittings” in the shape of circles.

“The purpose is to prevent that door plug from being pushed out of the air frame,” she said.

All those elements will get a close look, Homendy said.

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