Originally Posted by
barrymung
If all Pitot tubes are essentially identical, why have airbus stated they need replacement?
There's either a slight difference in design or a problem with manufacture, which means that these new probes are (apparently) less likely to fail.
Not having read the SB or AD I don't know.
NASA take this approach of ensuring backup systems are all different, why not airbus?
The
backup - ISIS - is dissimilar.
The
multiply redundant systems are similar.
I think you'll find that's a common design approach. Including NASA-specced systems. (Who aren't exactly 'golden' when it comes to safety of design, so I wouldn't put them on a pedestal myself)