Timeline for What prevents a commercial jet from electronically "resetting" the way a computer sometimes does?
Current License: CC BY-SA 4.0
9 events
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| Jul 16, 2021 at 9:07 | comment | added | Graham | @Vikki It's the only practical design, given how you need the things to be fired out. And like I said in the post, it's safe enough if you make damn sure the firing contacts can't be live when they're doing it. | |
| Jul 15, 2021 at 20:41 | comment | added | Vikki | @Graham: That seems like... not the best design. | |
| Jul 15, 2021 at 7:38 | comment | added | Graham | @Vikki The design of the dispenser is basically a 6x6 grid of tubes in a rectangular frame. A flare or chaff cartridge goes in each hole, and then the armourer plugs the loaded frame onto the mounting panel which has the firing contacts. Inevitably this means he has 36 armed tubes facing him as he slides it home. | |
| Jul 15, 2021 at 2:04 | comment | added | Vikki | "The most serious risk was actually that the system would misfire whilst an armourer was reloading it, because then they'd get a volley of 36 shotgun shells to the head at close range" - Why was the armourer standing in the flare dispenser's line of fire while reloading it? | |
| Jan 6, 2020 at 10:30 | comment | added | Peter Smith | It might be worth noting that the test / quality process requires independence from the team that actually implemented the code in many cases. (Certainly true for DO-178 and DO-254). | |
| Jan 5, 2020 at 21:33 | comment | added | Graham | @Peter-ReinstateMonica Thanks. All very true, of course. I was worried I'd gone on too long as it was though! :) | |
| Jan 4, 2020 at 9:39 | comment | added | Peter - Reinstate Monica | Very good answer. You could, if you have time, elaborate a sentence or two on how the very processes of software and hardware development for safety critical systems are strictly defined to ensure the safety of the finished product, e.g. as in IEC 61508 and then domain specific norms. To actually have a proven, systematic, documented process which ensures that requirements are fulfilled, specifications are followed, reviews and testing is ensured etc. is the most crucial difference to general product development. | |
| Jan 3, 2020 at 14:06 | history | edited | Graham | CC BY-SA 4.0 |
added 76 characters in body
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| Jan 3, 2020 at 11:36 | history | answered | Graham | CC BY-SA 4.0 |