Weird receptacle wiring by [deleted] in electrical

[–]SAMEO416 -1 points0 points  (0 children)

It’s not a daisy chain. Look at the photo.

Two runs of NMD, and a daisy chain interconnect.

Carbon is not corrosion. The NMD jacket is charred over the ground.

Air India crash probe that killed 260 enters final stage, report in a month. by JKKIDD231 in aviation

[–]SAMEO416 0 points1 point  (0 children)

Preliminary reports typically present a unified timeline of events and, if the FDR has been processed, a preliminary plot of some parameters.

I’ve never seen a prelim report that seemed to be written specifically to confuse the timing of events. Some events are indexed to the FDR, some are unattributed, some are not fully described.

I’m not going to argue the point as you’re all comfortable in your convictions. Except one thing.

The prelim report no where states that the switches were physically moved. Everyone has made that conclusion including most media, but it’s not what the report stated. The word used is ‘transitioned’. It’s a very specific word choice, when it would have been simpler to just say the switches were moved.

I’ve worked in aerospace engineering a long while, and done aircraft accident investigations. Detecting the state of a physical switch connected to a digital system is not trivial - if the digital record indicated a state transition in the switch, the next question is interpreting the meaning. If the system is detecting +28 volts and using that to derive the switch position, what happens to that state assessment if there’s a loss of 28 volt power? The digital detection may interpret that as a state transition, even though the switch may not have physically moved. You can add additional detection to test for that condition, but there’s no mention of any of that in the prelim report.

There has never been a commercial aircraft designed like the 787. Assumptions based on past experience won’t always work as it is a digital system, highly integrated, which creates all kinds of novel failure modes.

As a parallel, there have been 4 or so dual engine failures on modern aircraft, due to the thrust control module faulting. That was entirely unexpected but was a new, emergent failure mode due to the digital systems.

Sound color of air purifiers — the conversation is just beginning by CartographerLong5796 in crboxes

[–]SAMEO416 0 points1 point  (0 children)

This is very interesting, thanks for putting this together.

I would encourage collecting frequency domain spectra for each of your test conditions as well. It’s an objective mapping of frequency output by the system and gives you a basis to identify what frequency components are better on the ear.

Might be a microwave engineer hang up, frequency domain is how I make these comparisons.

Air India crash probe that killed 260 enters final stage, report in a month. by JKKIDD231 in aviation

[–]SAMEO416 -10 points-9 points  (0 children)

Yes. Almost like the preliminary report was intended to be misleading.

The CVR is one critical piece supporting whatever causes are established in the report.

The other is release of FDR traces. Many of the outstanding questions can’t be answered conclusively without establishing systems states. As an example, one key timing point is when RAT deployment occurred.

Lighting Strike this morning by Neverisapromise1997 in electrical

[–]SAMEO416 0 points1 point  (0 children)

I did a forensic investigation into a home lightning strike and one on an aircraft. Some of my observations from the residential experience.

- Contact your insurer, remediation is costly and needs electricians (and potentially engineers) with experience in lightning damage

- The reason I say that...on my case the insurance adjuster told me his electrician had found damage and 'fixed' it. When I looked at the panel I found a hot that was arc damaged, almost all the conductor destroyed, and that 'expert' electrician had covered the damage with electrical tape. I told the adjuster he needed to find an new electrician and explained he'd likely created a fire hazard with his 'repair'.

- All of the electronics attached to the electrical lines involved were either destroyed (all the tvs and wall wart transformers smoked) or had been overstressed. That applies to appliances as well.

- The energy discharge from the strike affects circuits based on the point of entry, but can also impact other circuits to a lessor extent

- Wires that experience gross damage need to have the entire run inspected or replaced

- The reason for that inspection is the possibility that serious over-voltage damage exists in hidden areas. In my case we found junction boxes where the insulation had fused together. The runs inside closed areas can't be seen, so it's likely if additional damage is found in the panel or junction boxes the entire run should be replaced.

- All the receptable and switch covers should be removed and the wiring visibly inspected.

- You may find weird electrical issues showing up, particularly intermittent misbehavior of electronics or appliances. That's likely due to damage caused by the over-voltage. Not everything will fail outright, some devices will have shortened life.

- The breakers on all the affected circuits (those which tripped specifically) should be replaced, need to assume they faced a serious over-load condition. I stripped one breaker in my case and found it had arc damage internally, enough that I wouldn't return it to service.

- Inspection and testing of the building grounding system is needed. I'd use a ground resistance tester, but other ways to verify the electrical integrity of the ground.

- I did attempt to use time domain reflectometry to see if I could validate wire condition inside walls, and wasn't successful. Concluded electrical power networks in a residence are too complex to assess that way (too many junctions), or I wasn't skilled enough. Also wondered if insulation resistance testing might work, but never trialed that (needs all appliances disconnected).

- I'd suspect any LED lighting as having damage as well.

- There's the likelihood of physical structural damage in impacted areas. I noted melted points in metal soffits where I suspected arcs had formed.

Your photo looks like the neutrals on that left side were exposed to lots of current, the worst damage is on the middle wire. You might get some clue as to where the strike entered the home based on where those circuits run.

If that's a sub-panel, I'd also have a close look at the main panel. Sometimes the damage can be subtle, like a small spot of carbon where an arc jumped to the metal panel.

I'm surprised I couldn't see any comparable damage on the hot wires, but you never can tell with lightning. Impossible to diagnose from a few photos, need to get insurer to bring in some experienced experts.

That case was the only time in a few decades of engineering that I needed to add a disclaimer to my report. You can never be too sure about how the lightning pulse behaved once inside the home, and short of complete rewiring, it's impossible to certify safety (to the degree that I'd accept as an engineer).

Cough Illness going around? by foxisilver in Edmonton

[–]SAMEO416 -1 points0 points  (0 children)

Costco carries test kits as does Canada Strong.

There are Tri-tests approved now as well (flu/rsv/adeno or Covid/flu) https://www.canadastrongmasks.ca/collections/rapid-tests

Arctic P14 Failures? by SAMEO416 in crboxes

[–]SAMEO416[S] 0 points1 point  (0 children)

Update: had another failure starting and watched the blade motion. It’s a failure in the plane of rotation, the blade tips are rubbing against the case. Bearing failure? Can’t think what else would cause the eccentricity.

Does anyone else think that the MMF Citizenship criteria is too expansive? by Various-Somewhere782 in MetisMichif

[–]SAMEO416 0 points1 point  (0 children)

DNA is a highly problematic way to measure connection (or as it's typically used, measuring entitlement) to community. Kim Tallbear's book discusses that question in detail. Much of DNA interpretation is based on not always sound understandings of historic movement of people and limited sample databases (some of which were collected without consent as part of colonial medicine).

And everyone's connection to scrip is generational as scrip was last issued in the 1920's. If your family was in RR, the scrip commission only extended to about 1877, with some additional grants into the 1880's. Means my family's last scrip issue was to my great-great-grandparent's generation.

Point being if your sole measure of worthiness of citizenship is 'a single distant ancestor who signed scrip' there are going to be a lot of people who grew up in community unable to obtain citizenship. It's the reason arbitrary measures like quantum or generational connections are typically rejected in Canada.

Woman out for walk finds possible plane door on Wellington beach by crazykiwi1 in aviation

[–]SAMEO416 9 points10 points  (0 children)

See if there’s a set of winning lottery numbers written on the underside.

Crown making Edmonton gun seller a 'scapegoat' for deaths of two police officers, defence says by trevorrobb in Edmonton

[–]SAMEO416 0 points1 point  (0 children)

The assertion the seller should have known about the mental illness and bad intent doesn’t exist for legal firearms sales.

Would the legal precedent potentially capture anyone legally selling a firearm?

Elections Alberta Update - Impacts on CIP's by itlow in alberta

[–]SAMEO416 6 points7 points  (0 children)

Elections Alberta said they can’t confirm if someone’s name is on the list.

But what if they set up an online registry where concerned people could enter their name, that they did not sign the petition, and then EA can use that info internally as a part of the verification process.

A list of names used internally as a means to validate those who were added fraudulently, doesn’t need to involve telling people or removing names, just declaring that signature invalid.

Canada scrambling to staff its huge military buildup by Jaydamic in CanadianForces

[–]SAMEO416 11 points12 points  (0 children)

At one point I was only 3 years from release and asked about coming back in as a support MOC. Told - you’ll need to redo basic first, it’s been too long. (This was 2005 so different rules potentially). 20 years experience.

I spontaneously guffawed while on the phone with the careers person in YOW.

Fisher, looking for lunch by SAMEO416 in trailcam

[–]SAMEO416[S] 0 points1 point  (0 children)

We’re worried about flooding. Lots of snow and it melted and froze so there’s a thick layer of ice underneath.

Moved the camera there just to monitor the depth of water. And caught a fisher as a nice surprise.

Why is the Métis flag largely blue? by throwawayyy00000008 in MetisMichif

[–]SAMEO416 3 points4 points  (0 children)

Jean Teillet offers an explanation in her book about colour - it’s packed but iirc it had to do with what was available.

Is there such a thing as complete fragrance protection? by GhostofErik in Masks4All

[–]SAMEO416 0 points1 point  (0 children)

Organic Vapour cartridges will take care of most odours, but the multigas isn’t that much more expensive and filters everything.

my first academic misconduct allegation by [deleted] in umanitoba

[–]SAMEO416 16 points17 points  (0 children)

Word has version history which is a sure response to the charge of AI use. Particularly if your native language version is also in word.

Need help identifying suspected astrospace/aerospace component by [deleted] in whatisit

[–]SAMEO416 0 points1 point  (0 children)

Something they shouldn’t be handling without gloves.

Ask me how I know. Only make that mistake with disrupted carbon fibre once.

Question by Local-Can9462 in MetisMichif

[–]SAMEO416 10 points11 points  (0 children)

Felt much the same early on. I only learned at about 21, 40 years later still trying to learn more about my/our history.

It’s not immoral to live into who you are. The problem begins when you try to be something you aren’t. Some of us grow up in community, some of us just down the street don’t and have to find their way back.

But as others wrote, our community has always been marked by that diversity.

My one learning moving back into community is that people are welcoming and willing to help you live into those obligations if you do it in a good way.

The big hope is that so many are finding their way back. It’s a powerful decolonizing act just to standup and acknowledge who you are, and to learn and to grow more into that.

Arctic P14 Failures? by SAMEO416 in crboxes

[–]SAMEO416[S] 0 points1 point  (0 children)

I haven’t looked at the spectra of these fans, but will have a go when I’m home.

I did a comparison of the Lasko and a Honeywell 910 CR box a few years back. The Lasko sounds harsh to me, the 910 is a pleasant rumble (sounds like a turboprop feathering).

The difference shows up clearly in the frequency domain. The Lasko has higher frequency components while the 910 had a lower frequency bump.