|Quoting WNCrew (Reply 5):|
The flaps on the 737-757 only serve as a means to "shrink" the outer surface area of the main doors so they can be opened and closed since the doors themselves are larger than the openings and to OPEN, the doors must first come into the cabin before rotating out.
True, but I also think that safety is just as an important reason for the vent flaps. The door handle is mechanically linked to the vent flaps which physically prevents the door handle being moved to the open position if there is a cabin pressure differential. The flaps are rigged to move before the opening mechanism, so that even if someone is strong enough to force the handle when the cabin is pressurised, the vent doors will at least vent some of the pressure differential. These vent doors are also fitted to the cargo doors of many Boeings.
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Photo © Wolodymir Nelowkin
|Quoting MarkHKG (Reply 6):|
Thanks for the replies everyone. I'm just curious why Airbus did not opt to install vent flaps into the doors, considering the deaths of at least two cabin crew in two separate incidents involving the A300.
It does seem to be one of the noticeable differences between Boeings and Airbus. In many critical areas on the 747, Boeing will usually fit some sort of mechanical device to physically prevent something from being activated or moved when it is unsafe to do so. Airbus tends to usually only have some sort of light or buzzer or electrical disconnect to do the same. There does not seem to be as many mechanical interlocks on an Airbus, which then puts the onus back on the individual to be sufficiently trained to recognise these warnings.