Are the emergency exits on a Boeing 747-400 plug doors?

Question

Rossiya Airlines flight FV5625 to Antalya suffered an incident at the gate when a passenger opened an emergency exit (seems to be the L3 door, from what I can tell) "because they felt too hot", deploying the slide.

In a discussion on the news item, someone remarked that it was lucky that it didn't happen in flight, which of course should be impossible.

But that made me wonder whether that emergency exit is a plug door, or if there's another mechanism preventing the door being opened in flight.

Answer 1

Yes, all 10 passenger entry doors on the 747-400 main deck are plug-type doors:

The main deck passenger entry doors are used to enter and exit the airplane, and serve as emergency exits. The ten passenger entry doors are paired along the airplane fuselage. [...]

The entry doors are translating, plug-type doors. During opening, the door first moves inward and upward, then translates outward and forward.

^{(Boeing 747-400 FCOMv2 1.50.3 - Airplane General, Emergency Equipment, Doors, Windows - System Description, emphasis mine)}

This will make accidental opening of these doors while the aircraft is pressurized impossible.

Based on the picture from the video it was the L2 door, right in front of the wing (L3 is the overwing exit):

^{(YouTube: Passenger deploys emergency slide on Rossiya Airlines 747)}

The passenger who opened the door probably did not know about the ARM state of the door:

Passenger Entry Door 1, 2, 4, and 5 Slide/Raft Operation

When the door mode select lever is in ARM position and the door operating handle is rotated 180 degrees, the door begins to open and the power assist opening system activates.

The flight attendant must release the door operating handle and continue to assist the door opening motion by using the handles on the door and on the door surround panel until the door is in the full open and latched position. The door-mounted escape slide/raft deploys and inflates. [...]

When the door is to be opened from the interior and slide deployment is not desired, the door mode select lever must be in DISARM position.

^{(Boeing 747-400 FCOMv2 1.50.3 - Airplane General, Emergency Equipment, Doors, Windows - System Description)}