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Search: Posts Made By: USMCProbe
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Forum: Tech Log
9th Mar 2013, 16:15
Replies: 1,100
Views: 262,982
Posted By USMCProbe

Every plane that I can remember flying had an...

Every plane that I can remember flying had an auto shutdown feature on the ground in case of APU fire. It must be a certification thing. The APU can be running with no crew aboard for aircraft...
Forum: Tech Log
9th Mar 2013, 03:46
Replies: 1,100
Views: 262,982
Posted By USMCProbe

I believe on most airliners, if the batteries are...

I believe on most airliners, if the batteries are shut off (offline) one way or another, the APU shuts down due to the APU ECU being unpowered. I did it by accident on a 320 a year ago. APU's...
Forum: Tech Log
8th Mar 2013, 16:51
Replies: 1,100
Views: 262,982
Posted By USMCProbe

The 787 APU has two starter/generators each. One...

The 787 APU has two starter/generators each. One powered by the APU battery, one by "something else". If ships power is available, the starter that is powered by ships power starts the APU. ...
Forum: Tech Log
12th Feb 2013, 20:58
Replies: 1,100
Views: 262,982
Posted By USMCProbe

A friend of mine is a drag racer. His drag...

A friend of mine is a drag racer. His drag racing "hero" has a quote that he always repeats. "The best way to cut 100 lbs off a race car, is to find 1600 ways to cut 1 ounce."

There are...
Forum: Tech Log
10th Feb 2013, 17:17
Replies: 1,100
Views: 262,982
Posted By USMCProbe

Regulating agencies are always a step behind the...

Regulating agencies are always a step behind the industries that they regulate. If they were not, there would be no innovation. Banks, airplanes, whatever. I don't blame the FAA. They did the...
Forum: Tech Log
10th Feb 2013, 06:29
Replies: 1,100
Views: 262,982
Posted By USMCProbe

I am glad to be wrong. The NTSB said both...

I am glad to be wrong. The NTSB said both failures were caused by the same thing. I cell failed (for some reason).

The only thing I don't like in the battery is what Cockney Steve said. I want a...
Forum: Tech Log
8th Feb 2013, 10:48
Replies: 1,100
Views: 262,982
Posted By USMCProbe

Fizz57 I could not agree more about Yuasa ...

Fizz57

I could not agree more about Yuasa and would add the same comment about ANA and JAL as operators. I have friends that used to work for both. There may be some other airlines in the world...
Forum: Tech Log
8th Feb 2013, 05:44
Replies: 1,100
Views: 262,982
Posted By USMCProbe

My opinion. ANA battery: One battery...

My opinion.

ANA battery:

One battery entered thermal runaway, causing heat damage to the others.
causes:

A single defective/mishandled/damaged cell.
Bad battery charger/BMS
Forum: Tech Log
8th Feb 2013, 05:22
Replies: 1,100
Views: 262,982
Posted By USMCProbe

Charred to a crisp: New pictures show how full...

Charred to a crisp: New pictures show how full extent of damage to burnt Dreamliner batteries which prompted emergency landing | Mail Online...
Forum: Tech Log
7th Feb 2013, 16:44
Replies: 1,100
Views: 262,982
Posted By USMCProbe

I just went out and had a 6 mm thick SS...

I just went out and had a 6 mm thick SS enclosure fabricated for my Galaxy S2 so I don't self immolate with it in my pocket. I also put a 100mm spacer between the battery and the phone so it...
Forum: Tech Log
6th Feb 2013, 16:06
Replies: 1,100
Views: 262,982
Posted By USMCProbe

The first 400 opinions were pretty good. ...

The first 400 opinions were pretty good. Everybody added in a little knowledge, and asked a few questions. I learned a lot. It was the best thread on PPRune I ever read.

But I fly airliners,...
Forum: Tech Log
6th Feb 2013, 15:47
Replies: 1,100
Views: 262,982
Posted By USMCProbe

This thread has gone thermal runaway. LI...

This thread has gone thermal runaway.

LI batteries are as proven, and maybe more, than any other battery technology, ever. Does your Iphone or laptop have a placard that says "charge only 5...
Forum: Tech Log
6th Feb 2013, 02:54
Replies: 1,100
Views: 262,982
Posted By USMCProbe

The "frayed and broken earthing wire" looks like...

The "frayed and broken earthing wire" looks like it was mechanically destroyed. I.e. somebody wanted to take the battery out in a hurry and didn't have the right tools. It is not...
Forum: Tech Log
5th Feb 2013, 03:02
Replies: 1,100
Views: 262,982
Posted By USMCProbe

I wonder why they can't just INOP the battery...

I wonder why they can't just INOP the battery chargers during flight until they find the problem.

Something like this.

1. No APU starts off the battery, must use external power on ground to...
Forum: Tech Log
4th Feb 2013, 08:39
Replies: 1,100
Views: 262,982
Posted By USMCProbe

And another. 777's engine anti-ice is "auto". ...

And another. 777's engine anti-ice is "auto". Not on. You might not know it is turned on. But it was 12 years ago for my last flight on it. I think wing anti-ice was still on/off.

Is this...
Forum: Tech Log
4th Feb 2013, 03:57
Replies: 1,100
Views: 262,982
Posted By USMCProbe

If we assume the two event aircraft were the only...

If we assume the two event aircraft were the only ones that fried their batteries, what was the condition of the two flights where it happened? In cruise flight, both batteries should get little to...
Forum: Tech Log
4th Feb 2013, 02:54
Replies: 1,100
Views: 262,982
Posted By USMCProbe

I am sure if there was a short circuit, a fusible...

I am sure if there was a short circuit, a fusible link would have worked. I think the APU battery is only used for a couple of things, so a short circuit would have been easy to identify as the...
Forum: Tech Log
3rd Feb 2013, 11:06
Replies: 1,100
Views: 262,982
Posted By USMCProbe

Question for the BMS/electrical gurus: For...

Question for the BMS/electrical gurus:

For some reason they put the main battery terminals extremely close together on the outside of the case. 30V is not a lot, but the higher the voltage, the...
Forum: Tech Log
3rd Feb 2013, 08:25
Replies: 1,100
Views: 262,982
Posted By USMCProbe

I can't see any pattern. If it was a single bad...

I can't see any pattern. If it was a single bad cell going off, I would expect to see a "damage gradient", no matter how the heat was generated.

I would also guess this was a single event. Had...
Forum: Tech Log
3rd Feb 2013, 05:32
Replies: 1,100
Views: 262,982
Posted By USMCProbe

Saptzae; Can you post a CT scan of a perfect,...

Saptzae;
Can you post a CT scan of a perfect, undamaged battery?
Forum: Tech Log
3rd Feb 2013, 04:06
Replies: 1,100
Views: 262,982
Posted By USMCProbe

#3 looks the least damaged. To me that means the...

#3 looks the least damaged. To me that means the BMS did a good job balancing the charging, and the whole thing was overcharged. IMHO that means there was not a single defective cell. 7 defective...
Forum: Tech Log
3rd Feb 2013, 03:38
Replies: 1,100
Views: 262,982
Posted By USMCProbe

I would say #1 and #3 are the closest to normal,...

I would say #1 and #3 are the closest to normal, and the streaks are normal. When the rest of the cells were overcharged they all bulged and the spaces between the individual "plates" (not sure...
Forum: Tech Log
2nd Feb 2013, 13:02
Replies: 1,100
Views: 262,982
Posted By USMCProbe

It might not provide massive bleed air for AC and...

It might not provide massive bleed air for AC and engine start, but it is going to have to provide massive amounts of electricity to accomplish the same things.

The starter for the engines on the...
Forum: Tech Log
1st Feb 2013, 00:41
Replies: 1,100
Views: 262,982
Posted By USMCProbe

APU battery usage depends on how diligent an...

APU battery usage depends on how diligent an airline is about not using the APU. Some airlines try to not use it at all costs. Some use it every flight, maybe twice (before engine start and before...
Forum: Tech Log
31st Jan 2013, 11:16
Replies: 1,100
Views: 262,982
Posted By USMCProbe

Sorry I wrote it wrong again. I thought lithium...

Sorry I wrote it wrong again. I thought lithium batteries were charged individually in an application like this. Discharged in series is a given.


When I read the NYT article about the ANA...
Forum: Tech Log
31st Jan 2013, 11:02
Replies: 1,100
Views: 262,982
Posted By USMCProbe

Sorry I misspoke. I did mean I was surprised that...

Sorry I misspoke. I did mean I was surprised that the batteries were not charged in parallel, individually. Including monitoring individual current. I did not mean I was surprised they were...
Forum: Tech Log
30th Jan 2013, 01:29
Replies: 1,100
Views: 262,982
Posted By USMCProbe

RR NDB: The cells are charged serially? I...

RR NDB:

The cells are charged serially? I thought early on i read that the cells are charged, voltage and temp monitored, individually. i.e. in parallel.

Have a bunch of closely stacked cells...
Forum: Tech Log
29th Jan 2013, 13:40
Replies: 1,100
Views: 262,982
Posted By USMCProbe

There are so many things that it could be. I...

There are so many things that it could be. I doubt any aircraft has ever produced as much electricity. An airplane is a "floating ground". This many trons running through a machine provides huge...
Showing results 1 to 28 of 28


 
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