Quote:
Originally Posted by HorridRedDog
Do manufacturer ever cut cost later by substituting cheaper, but similar, components at a later date? I'd bet on it.
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yes they do, and those components have different Electromagnetic properties. However there is not always a requirement for re-qualification testing.
A recent example was a PSU for Sony Laptops which suddenly interfered with wireless keyboard and bluetooth adaptors. The design for the PSU's were not changed, but some components were substituted for similar ones, that performed the same function but had slightly different tolerances and EMC characteristics, yet managed to blank-out the Wireless Spectrum for a 15 meter radius.
Just imagine what electronics or cabling linked to those electronics are with-in a 15 meter radius of your aircraft seat, if some manufacturer has changed a few minor components within your ereader.
To not switch them off when requested is bordering on Criminal Irresponsibility.