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Search: Posts Made By: Chris Scott
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Forum: Tech Log
9th Mar 2013, 11:45
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Me #881...

Me #881 (http://www.pprune.org/tech-log/505695-787-batteries-chargers-45.html#post7732935),
"If the APU and/or its 2 gennies (starter/generators) fail, perhaps catastrophically, there must remain a...
Forum: Tech Log
8th Mar 2013, 19:59
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Hi mm43, "The APU once online should be self...

Hi mm43,
"The APU once online should be self sufficient, and not beholden to the state of APU battery"

If the APU and/or its 2 gennies (starter/generators) fail, perhaps catastrophically, there...
Forum: Tech Log
8th Mar 2013, 19:38
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Two APU Starter/Generators

Quote from USMCProbe:
"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...
Forum: Tech Log
8th Mar 2013, 15:58
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Quote from inetdog: "For whatever reason, the...

Quote from inetdog:
"For whatever reason, the battery was still being charged a rate of ~45 amps 15 minutes after the APU start. Since there should be no other loads in flight (unless the BOS plane...
Forum: Tech Log
8th Mar 2013, 10:45
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Quote from TURIN, responding to the sugestion...

Quote from TURIN, responding to the sugestion that the APU may contribute some power to APU start even when main electrical power is available:

"This concept of the APUC being powered by the APU...
Forum: Tech Log
8th Mar 2013, 00:05
Replies: 1,100
Views: 263,127
Posted By Chris Scott

NTSB Interim Factual Report

Been out all evening since downloading it, but now see some have been struggling to locate it. Seems to be slightly different from the one posted above by archae86, but If his or others don't work,...
Forum: Tech Log
7th Mar 2013, 19:02
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Today's NTSB Interim Factual Report indeed makes...

Today's NTSB Interim Factual Report indeed makes interesting reading.

APU started at 1004 EST, battery failed at 1021 (only 1 minute after the flight crew had disembarked).

So the failure...
Forum: Tech Log
7th Mar 2013, 18:50
Replies: 1,100
Views: 263,127
Posted By Chris Scott

rogerg, Thanks for spotting my "deliberate"...

rogerg,

Thanks for spotting my "deliberate" (!) mistake. :{

Hi Lyman,

I now understand the thrust of your argument - thanks. Don't accept all of it, however. It's true that the six 2V...
Forum: Tech Log
7th Mar 2013, 16:25
Replies: 1,100
Views: 263,127
Posted By Chris Scott

It's time for another statement from...

It's time for another statement from Boeing/FAA/NTSB. This rumour mill is getting out of hand. Surely the customer airlines cannot be expected to do it. The credibility of the joint world-leader in...
Forum: Tech Log
2nd Feb 2013, 11:04
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Bernd, Yes. The limitations you describe...

Bernd,

Yes. The limitations you describe from two-years-old information are in line with normal practice for conventional APUs back to the 1960s. Unfortunately, as I've commented before, I was...
Forum: Tech Log
1st Feb 2013, 22:49
Replies: 1,100
Views: 263,127
Posted By Chris Scott

APU issues

Quote from TURIN:
"Chris Scott.
Temp/Time limits on the APU are due to a rotor bow problem caused by excess heat soak after shutdown.. The quick fix is to leave the APU inlet door open to allow...
Forum: Tech Log
30th Jan 2013, 18:48
Replies: 1,100
Views: 263,127
Posted By Chris Scott

APU management and ETOPS

Some time ago I argued that, if special restrictions were put on the discharge and charge of the APU battery in advance of a complete fix, ETOPS flights requiring the APU would still be possible if...
Forum: Tech Log
30th Jan 2013, 10:52
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Quote from USMCProbe (my bold): "Have a bunch...

Quote from USMCProbe (my bold):
"Have a bunch of closely stacked cells being fast charged and discharged in series seems like it would be a really bad design."

Am currently pretty much out of my...
Forum: Tech Log
26th Jan 2013, 18:31
Replies: 1,100
Views: 263,127
Posted By Chris Scott

saptzae, Thanks again for that. I now...

saptzae,

Thanks again for that. I now understand that the cell failure involves a complex series of temporary shorts at different spots, progressively destroying the cell.

The fact that the...
Forum: Tech Log
26th Jan 2013, 15:17
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Saptzae, Thanks for your latest posts. For...

Saptzae,

Thanks for your latest posts. For a layman like me, they seem to summarise the issues facing Boeing, Securaplane, Thales, and (perhaps) Yuasu very clearly; particularly your description...
Forum: Tech Log
24th Jan 2013, 13:56
Replies: 1,100
Views: 263,127
Posted By Chris Scott

saptzae, Thanks for your interesting post....

saptzae,

Thanks for your interesting post. Could you possibly, however, help me translate this clause into intelligible English for us laymen?

" ...resulting in a fart out of the tail pipe...
Forum: Tech Log
23rd Jan 2013, 22:46
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Quote from sb_sfo: "But I noticed one thing-...

Quote from sb_sfo:
"But I noticed one thing- you seem to be under the impression that 777s have more than one main battery. The ones I work on have a main and APU battery, and unless you want to...
Forum: Tech Log
23rd Jan 2013, 19:12
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Quote from Bsieker: “They are all variable...

Quote from Bsieker:

“They are all variable frequency AC, depending on generator rpm, so I guess it's not a good idea to try to power one bus from two different sources at the same time.”
...
Forum: Tech Log
23rd Jan 2013, 12:44
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Quote from bsieker: “...both main engines...

Quote from bsieker:

“...both main engines and the APU each have two starter/generators. The APU's SGs are designated "left" and "right".
A single dedicated starter would probably suffice, but...
Forum: Tech Log
23rd Jan 2013, 09:45
Replies: 1,100
Views: 263,127
Posted By Chris Scott

Quotes from bsieker: (1) “The only thing I...

Quotes from bsieker:

(1) “The only thing I found on this is that the APU battery is designed for two consecutive start attempts, after which a 5 minute cooling period must be observed before a...
Forum: Tech Log
22nd Jan 2013, 23:47
Replies: 1,100
Views: 263,127
Posted By Chris Scott

MWR, I agree with all that. Lyman, ...

MWR,

I agree with all that.

Lyman,

I don't understand your argument, but you might like to see my reply (http://www.pprune.org/rumours-news/505455-faa-grounds-787s-17.html#post7649675) to...
Showing results 1 to 21 of 21


 
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