Comment Re:Not the same for the Navigation Box (Score 1) 587
I can't see what would be different for the 380.
It is. appearantly to save weight...
From TFA:
Most passenger jets have two cabin-pressure valves, with separate motors operating each. Because aircraft makers want redundancy on safety systems, the planes have three motors for each valve, with different chips controlling each motor. The Boeing 777, for example, has cabin-pressure chips made by Motorola Inc., Intel Corp. and Advanced Micro Devices Inc. Most jetliners also have a manual override so that the pilot can take control in an emergency.
Airbus has acknowledged that its designers faced challenges as they attempted to reduce the A380's weight. Early on, the company elected to go with four outflow valves on the A380, with only one motor on each valve, which is slightly larger than a cabin window. Each motor uses a TTTech controller chip, and there is no manual override system.
It is. appearantly to save weight...
From TFA:
Most passenger jets have two cabin-pressure valves, with separate motors operating each. Because aircraft makers want redundancy on safety systems, the planes have three motors for each valve, with different chips controlling each motor. The Boeing 777, for example, has cabin-pressure chips made by Motorola Inc., Intel Corp. and Advanced Micro Devices Inc. Most jetliners also have a manual override so that the pilot can take control in an emergency.
Airbus has acknowledged that its designers faced challenges as they attempted to reduce the A380's weight. Early on, the company elected to go with four outflow valves on the A380, with only one motor on each valve, which is slightly larger than a cabin window. Each motor uses a TTTech controller chip, and there is no manual override system.
