Rattle in EICAS
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It's such a cool effect, the little rattles you hear when you first power on the EICAS. I assume it's all the messages that come up that makes the screen make that little sound? Love it!
But I don't know if anyone else notices it but the rattle sounds are a little out of sync with the messages. You hear the rattles first and then all the messages come up.
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Well no, but I'm not talking about the floppy disk reader head. I'm talking about when you turn on the EICAS for the first time. When that flurry of messages rapidly scroll onto the screen, it makes a rattle sound. I assume it has to do with because it's a CRT? Anyway in one of Nick's videos, you can hear that the rattling matches when each EICAS message comes up. The sound and the messages are no longer in sync.
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It does sound like relays, but I have a feeling it's something to do with the messages populating on the screen, maybe some kind of characteristic of these displays. Anyway in my Sim the clicking or rattle is out of sync with the messages populating. Unlike in that video
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I'm not convinced it's a hard drive sound. If these planes do have spinning disk drives, then that would most likely be up front in the avionics bay in the nose. You definitely wouldn't be able to hear it in the cockpit.
But hopefully Nick can confirm. Maybe there real is a drive inside the display rattling away. Although I don't know why it would be doing that to display eicas messages. It's not like they would be stored on there.
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The sound comes from the equipment in the IAPS Card Cage at the bottom of the double-door cabinet behind the copilot's seat. It has nothing to do with the EICAS messages, but just had convenient timing, apparently. There is a surprising amount of equipment in that cabinet. So much so that it has its own cooling air source from the cockpit blower.
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What is IAPS?
@Captain-Bakon Integrated Avionics Processing System.
