Post mortem on an IEC connector

Even then if you bother to bend the tags over when replacing them, the problem is less likely to recur.

Ron

Arrrggghhh !! Dontcha just hate trying to unsolder and remove components with bent-over legs ... ? Very true though that you should have a good mechanical joint first. It's the way I was taught too, not quite so long ago, but close. At college, we had to make connections to lengths of tagstrip, without melting the insulation on the single-strand wire, as practice pieces.

Arfa

The first transistor radio (and television) pcbs were designed so that, wherever possible, a component wire hole was /not/ in a piece of copper. This meant that all leads had to be bent over at right angles to meet the correct piece of copper. The great advantage of this was the ease of temporaily disconnecting a component for test/repair. Of course this was before auto-insertion made all the girls redundant... (quips here)

the

seen

Hence my

rather than

Doubtless needed it to cope with the environment.

Graham

Good point. I gather that Cadac 'hand wire' even pots to the PCB via short lengths of wire btw.

Graham

" green mist " ! I like it. We used to call it tomfoolery.

Graham

But they're made of plastic ! ;~)

Graham

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Did you know the world's first jet airliner ( the DH Comet ) used 'redux' glue to hold the majority of the airframe together ? Shame they didn't use it round the windows and access panels, thinking rivets were more 'belt and braces' not realising about microfractures from the drill holes. Caught out by a previously unknown phenomenon. I can hardly believe they had prototype Comets flying around

Graham

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message

wrong

Fly by wire uses 3 hidden "driver" computers running 3 different bits of firmware, then a democratic voting system that decides which 2 drivers to go with, before making a control surface movement. Now we recently know, in the UK, what such a voting structure produces in the way of a parliament.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

The interesting bits are from page 73 onwards. Scary stuff!

Indeed we do, and there have been more than a few instances where true fly-by-wire sytems of this type, have made a totally wrong decision in a given unusual set of circumstances, and the driver and his chum have been blocked from taking control to correct the situation. I have to say that whilst I am not by any stretch of the imagination, a nervous flyer, I do have serious misgivings about these robot-flown new technology Airbuses. And as for that new double decker thing designed and built all over Europe by committee, nothing in the world would persuade me onto one. The size of that thing is just plain WRONG !!

Arfa

Ok. Let me know if you do plan to be there. Maybe we can meet up. Get Michael down as well :-)

Arfa

Can you give a specific example ?

Graham

I'll get back to you on that. I remember seeing an example on "Air Crash Investigation", but I have a friend who is an aviator, and a walking encyclopedia on such things. I will be seeing him tomorrow. I'll try to remember to ask him.

Arfa

There was that French ? air show one, where the pilot quite gracefully, (no frantic movements appeared on control surfaces or engine speed) flew into woodland.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

Interesting forum for those of an aviation bent.

Ron

It IS a fact actually. Go to any of the professional aviation sites.

You know than Spanair MD-82 ? that crashed in Barcelona on takeoff for example not long back ? Pilots forgot to deploy the flaps on take-off because they were in a hurry after a maintenance delay that COULD have alerted them to the problem ( WOG fault ).

That's a nice recent one. I could give you loads more.

The Turkish one at Amsterdam, stalled into the ground ( called CFIT in the trade ) Controlled Flight Into Terrain. Pilots not monitoring instruments and flight attitude combined with an instrument fault ( pilots could EASILY have caught it

- they had 45 seconds to avoid a stall ).

And it goes on and on.

Graham

WOG = wheels on ground btw.

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THAT ONE is highly controversial. Not least an apparent 'black box' swap to cover up possible technical faults. Incidentally, the 'graceful' crash coutesy of the automation meant very few lives were lost. NO further A320 was fitted with that specific model of engine.

Graham

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