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Search: Posts Made By: EEngr
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Forum: Tech Log
5th Apr 2013, 23:07
Replies: 1,100
Views: 261,840
Posted By EEngr

kenneth house...

kenneth house (http://www.pprune.org/members/407907-kenneth-house)

Not really. Here is a diagram of a CSD and generator:
...
Forum: Tech Log
30th Mar 2013, 23:07
Replies: 1,100
Views: 261,840
Posted By EEngr

Define 'significant'. While it is possible to...

Define 'significant'. While it is possible to build a microcontroller-based system that has sub-milliampere current demands, I'm not certain of the technology of the monitoring equipment inside the...
Forum: Tech Log
30th Mar 2013, 19:04
Replies: 1,100
Views: 261,840
Posted By EEngr

kenneth house...

kenneth house (http://www.pprune.org/members/407907-kenneth-house)

Interesting. The NiCd 'trickle charge' mode that Boeing employed on previous models was also referred to as the T-R...
Forum: Tech Log
20th Mar 2013, 03:39
Replies: 1,100
Views: 261,840
Posted By EEngr

Ian W...

Ian W (http://www.pprune.org/members/161813-ian-w):

That's all good information to have. But that's not the place to capture it. The ground crews know that they are being watched and will work to...
Forum: Tech Log
18th Mar 2013, 19:23
Replies: 1,100
Views: 261,840
Posted By EEngr

Kiskaloo...

Kiskaloo (http://www.pprune.org/members/406529-kiskaloo):

Perhaps not if the fireproof box reduces the criticality of the failure. If it can be demonstrated that it is safe to continue flight with...
Forum: Tech Log
18th Mar 2013, 15:47
Replies: 1,100
Views: 261,840
Posted By EEngr

Ian W...

Ian W (http://www.pprune.org/members/161813-ian-w):

Exactly. I'm hoping that Boeing/Thales/GS Yuasa/Securaplane will continue lab testing until the nature of these failures and the battery system...
Forum: Tech Log
11th Mar 2013, 17:05
Replies: 1,100
Views: 261,840
Posted By EEngr

Its interesting to speculate about the battery...

Its interesting to speculate about the battery failure modes and possible design improvements. But what is the service experience with the GS Yuasa LVP65 battery in other applications? Good? Bad?
...
Forum: Tech Log
22nd Feb 2013, 16:29
Replies: 1,100
Views: 261,840
Posted By EEngr

TURIN (http://www.pprune.org/members/46562-turin)...

TURIN (http://www.pprune.org/members/46562-turin)

But not on fire. Even if it's in a titanium box, I doubt they'll push back and go.:uhoh:

What will the procedures be for a fire in flight (in...
Forum: Tech Log
19th Feb 2013, 18:27
Replies: 1,100
Views: 261,840
Posted By EEngr

cockney steve...

cockney steve (http://www.pprune.org/members/211915-cockney-steve):

If my airline starts putting a battery surcharge on my ticket, I'm blaming you for giving them the idea.;)
Forum: Tech Log
11th Feb 2013, 16:33
Replies: 1,100
Views: 261,840
Posted By EEngr

RR_NDB...

RR_NDB (http://www.pprune.org/members/349485-rr_ndb)

This might be more of a steady state phenomena. This APU is an AC device, driven by a variable frequency drive (an three phase inverter)....
Forum: Tech Log
9th Feb 2013, 18:03
Replies: 1,100
Views: 261,840
Posted By EEngr

Not really. Go back to SoS' original photo and...

Not really. Go back to SoS' original photo and look at those busbar connections. The thicker section is a piece of sleeving. You can see the end of it under the zip tie and the single wire coming...
Forum: Tech Log
1st Feb 2013, 15:04
Replies: 1,100
Views: 261,840
Posted By EEngr

Routinely, yes. But one of the functions of the...

Routinely, yes. But one of the functions of the battery systems is to provide power in an abnormal (emergency) situation. In this case, its better to kill the battery by running it dead than to lose...
Forum: Tech Log
28th Jan 2013, 19:13
Replies: 1,100
Views: 261,840
Posted By EEngr

There are two nations' regulatory agencies...

There are two nations' regulatory agencies involved in the preliminary investigation. And some of us have multiple agencies with skin in the game (NTSB, FAA). And getting through the layers of...
Forum: Tech Log
28th Jan 2013, 02:49
Replies: 1,100
Views: 261,840
Posted By EEngr

Just the one battery? I'd want to see a...

Just the one battery? I'd want to see a statistically significant sample from the entire fleet. All would be even better, but there may not be lab time to do that many detailed teardowns.
Forum: Tech Log
22nd Jan 2013, 16:02
Replies: 1,100
Views: 261,840
Posted By EEngr

syseng68k...

syseng68k (http://www.pprune.org/members/302789-syseng68k), I'd stick with the LiON batteries for the short term (excuse that 'short' remark :E). If it can be determined that these failures are...
Forum: Tech Log
21st Jan 2013, 19:22
Replies: 1,100
Views: 261,840
Posted By EEngr

Not if there is some deficiency in the parameters...

Not if there is some deficiency in the parameters read or the battery model inherent in the system. The goal is to compare what the charger/controller/FDR sees to the actual internal state of the...
Forum: Tech Log
21st Jan 2013, 17:30
Replies: 1,100
Views: 261,840
Posted By EEngr

In- service samples?

If I were running the forensic program, I'd be asking some of the airlines to provide samples of their batteries with varying service histories (together with the charger's history records) for some...
Showing results 1 to 17 of 17


 
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