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Search: Posts Made By: kenneth house
Showing results 1 to 35 of 41
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Forum: Engineers & Technicians
5th May 2014, 02:09
Replies: 11
Views: 4,946
Posted By kenneth house

i guess the battery rumor was true

Evidently 5400 lbs of lithium batteries were in the cargo bay of MH370.

Is there any path for fumes or vapors from the cargo bay back into the passenger compartment?

i was thinking that this...
Forum: Engineers & Technicians
29th Mar 2014, 15:15
Replies: 11
Views: 4,946
Posted By kenneth house

Swelling of lithium cells in cargo bay

A -4 psi delta pressure on a cell could cause the casing (metal or plastic) to bulge outward and deform the internal current collectors and create an internal short circuit. A shorted cell could...
Forum: Engineers & Technicians
28th Mar 2014, 04:50
Replies: 11
Views: 4,946
Posted By kenneth house

B777 cargo bay pressures?

i was thinking about how the reduced pressure in the cargo bay might affect a box full of lithium battery cells. What would be a typical or lowest exected pressure (e.g. highest altimeter pressure)?
Forum: Tech Log
2nd Mar 2014, 16:46
Replies: 1,033
Views: 502,961
Posted By kenneth house

At Vertical speed of -25fps

@mm43 chart:

From IMTOY to MDA only took 5 seconds,

Then to bottom of clouds, sink rate alert, just 8 more seconds.

Runway in sight, 3 more seconds.

By then the treetops were only...
Forum: Tech Log
6th Oct 2013, 09:51
Replies: 37
Views: 18,596
Posted By kenneth house

How long does it take to build a panel?

This looks like an interesting case study for an MBA program. You have to wonder if any changes were made with the 2010 change in ownership that affected the manufacturing and assembly process?...
Forum: Tech Log
6th Sep 2013, 18:26
Replies: 1,033
Views: 502,961
Posted By kenneth house

You could do Four?

You must be superhuman--i could only do 3 digits on the sliderule and never even thought about trying to get a 4th.
Forum: Tech Log
1st Sep 2013, 12:00
Replies: 1,033
Views: 502,961
Posted By kenneth house

Would it be plausible in the above situation,...

Would it be plausible in the above situation, that, thinking they were nearly at the MAP over the TH they might descend to the bottom of the clouds to look for the runway before doing the missed...
Forum: Tech Log
1st Sep 2013, 10:37
Replies: 1,033
Views: 502,961
Posted By kenneth house

1.3 nm

After looking at MM43's chart and the graphs and earthviews, etc. it appears that they made contact with trees almost exactly 1.3 nm before the TH.

This seems a strange coincidence with the 1.3...
Forum: Tech Log
1st Sep 2013, 10:07
Replies: 1,033
Views: 502,961
Posted By kenneth house

Small nit, should be 350 down for each nm ?

Small nit, should be 350 down for each nm ?
Forum: Tech Log
31st Aug 2013, 00:06
Replies: 1,033
Views: 502,961
Posted By kenneth house

Autopilot versus Autothrottle

Would it be possible to get dominating or conflicting guidance, navigation or flight control commands due to the mode selection when using these automation/software functions at the same time?

...
Forum: Tech Log
30th Aug 2013, 03:13
Replies: 1,033
Views: 502,961
Posted By kenneth house

Those are some interesting graphics. Mrs. Benson...

Those are some interesting graphics. Mrs. Benson said she found pieces of aluminum on her back porch, and i have to wonder if tree contact was made earlier to do some initial damage, and then again...
Forum: Tech Log
27th Aug 2013, 11:39
Replies: 1,033
Views: 502,961
Posted By kenneth house

autopilot ?

Would it be possible to enter an incorrect value for the MDA @IMTOY, e.g. typo 1-2-0 or 2-0-0 instead of 1-2-0-0, and the autopilot would try to fly that profile? What are the typical safeguards or...
Forum: Tech Log
23rd Aug 2013, 13:52
Replies: 1,033
Views: 502,961
Posted By kenneth house

G/S angle?

@MM43

The FAA LOC18 approach plate that aterpster showed earlier had TCH of 48' and G/S angle of 3.28. Did you have a different plate, or why did you use 3.20 on your excellent profile graphic?
Forum: Tech Log
22nd Aug 2013, 14:09
Replies: 1,033
Views: 502,961
Posted By kenneth house

Beacon on a hill

Can it be seen in this photo?
http://avherald.com/img/ups_a306_n155up_birmingham_130814_2.jpg
Forum: Engineers & Technicians
26th Jul 2013, 02:37
Replies: 1,150
Views: 729,434
Posted By kenneth house

Environmental conditions can be critical

Ancient Mariner showed photos (many thanks) and said:

[The batteries were taken straight out of the box and put on shelves, they were airfreighted! to us and we could not find anything wrong with...
Forum: Rumours & News
25th Jul 2013, 10:51
Replies: 119
Views: 85,731
Posted By kenneth house

What are the green frame structures?

Are those the trays to run wire and cables? Are they aluminum or composite?
Forum: Engineers & Technicians
24th Jul 2013, 17:25
Replies: 1,150
Views: 729,434
Posted By kenneth house

A Smashing Success

i enjoy the attention to precision in the written word--it seems to be primarily a British trait as keepers of the king's english. We are after all two countries separated by a common language.
...
Forum: Engineers & Technicians
23rd Jul 2013, 10:08
Replies: 1,150
Views: 729,434
Posted By kenneth house

An interesting theory...

@ simple-simon post #666

but could you condense it down to a simple version?


Looking at the pattern of the charred area it appears that the longitudinal struts (also a composite structure?)...
Forum: Tech Log
21st Jul 2013, 09:59
Replies: 38
Views: 5,135
Posted By kenneth house

You mean the water molecules in the air?

Humid air has less oxygen per unit of volume (i.e. less dense) available for combustion, hence weaker mixture and lower engine power output. Air at sea level is denser than that at higher elevations...
Forum: Engineers & Technicians
19th Jul 2013, 23:20
Replies: 1,150
Views: 729,434
Posted By kenneth house

a good primer on battery failure

that explains where the oxygen originates that can cause such a strong fire that halon cannot extinguish.

Lithium Battery Failures (http://www.mpoweruk.com/lithium_failures.htm)
Forum: Tech Log
1st Jun 2013, 13:17
Replies: 47
Views: 9,233
Posted By kenneth house

@ Bye and Hydromet You guys crack me up--i...

@ Bye and Hydromet

You guys crack me up--i spit coffee all over the keyboard...
Forum: Tech Log
30th May 2013, 20:58
Replies: 47
Views: 9,233
Posted By kenneth house

yep, y'all are

definitely bi-metric and stuff, momma and them even said so...

Oh yeah what is the formula for that kinetical energy, could somebody post that again?
Forum: Tech Log
2nd May 2013, 13:56
Replies: 72
Views: 22,354
Posted By kenneth house

It's all 'Nominally' at cabin pressure, but varies along the path.

@ Turin

On page 53 of the Airworthiness report is a figure showing the E/E compartment being just upstream of the overboard exhaust valve. The pressure in the cabin will be higher than in the EE...
Forum: Tech Log
1st May 2013, 04:47
Replies: 72
Views: 22,354
Posted By kenneth house

That delta P was looking at the Root Cause, not at the vault...

@PickyPerkins
i would think that the pressure in the Aft E/E is actually lower than cabin pressure since there is airflow into the EE from the cabin, so the delta P in the event configuration may...
Forum: Tech Log
29th Apr 2013, 23:29
Replies: 72
Views: 22,354
Posted By kenneth house

The cell and pack capacity is still the same

rated at 65 Ahr, but the state of charge (SOC) and the depth of discharge (DoD) may now be different. One of the documents mentioned that the battery pack would lock up (open the contactor) and...
Forum: Rumours & News
29th Apr 2013, 02:05
Replies: 2,185
Views: 1,033,579
Posted By kenneth house

ANA to resume service June 1

Reported on Bloomberg this evening.
Forum: Tech Log
25th Apr 2013, 19:05
Replies: 72
Views: 22,354
Posted By kenneth house

Acceptance testing at ~5000 ft

According to Thales in the Battery Acceptance Test Procedure general ambient conditions for all tests were performed with atmospheric pressure from 84 to 107 kPa, temperature at 25 +/-10 C.

The...
Forum: Tech Log
25th Apr 2013, 01:58
Replies: 72
Views: 22,354
Posted By kenneth house

14,000 cells built since 2001

and never had an internal short-- according to the GS Yuasa representative in today's hearing. These are the industrial cells of the same construction as the 787 cells, but using a different...
Forum: Tech Log
24th Apr 2013, 10:28
Replies: 72
Views: 22,354
Posted By kenneth house

Oh but we meant to do that

In the new set of documents that was just released on the NTSB Docket site. On docket # SA-536, exhibit # 17-A, Airworthiness Excerpts from Boeing Battery Specification Control Drawing:

page 89,...
Forum: Tech Log
24th Apr 2013, 03:34
Replies: 72
Views: 22,354
Posted By kenneth house

airworthiness factual report error

In the airworthiness factual report there appears to be an error on page 16 concerning the JAL APU start power consumption.

The Flight Data Recorder report shows measurement...
Forum: Rumours & News
19th Apr 2013, 02:22
Replies: 2,185
Views: 1,033,579
Posted By kenneth house

For what purpose are all those circuit boards

In that bottom card rack next to the APU battery location? Looks like some sort of VME chassis with a shedload of cards...

If Boeing and subs understood the Lithium charging procedure there...
Forum: Rumours & News
14th Apr 2013, 14:34
Replies: 2,185
Views: 1,033,579
Posted By kenneth house

where can we find those BMU-fix details?

@whatdoes..
[A box around the battery isn't the fix, the fix is the modified BMU processors...the alterations made to the batteries and their charging and monitoring systems.]
Forum: Tech Log
8th Apr 2013, 02:57
Replies: 1,100
Views: 262,639
Posted By kenneth house

What holds up the 270 VDC buss?

@ TURIN:
Are there any battery packs or capacitors to store or hold up the 270 buss, or is it just created as needed?
Forum: Tech Log
7th Apr 2013, 15:29
Replies: 1,100
Views: 262,639
Posted By kenneth house

Starter windings?

@EEngr Thank you for posting the link to the CSD and generator schematics, that is a really clever design to avoid using brushes and magnets for an alternator. Do you also have a schematic for the...
Forum: Tech Log
5th Apr 2013, 17:54
Replies: 1,100
Views: 262,639
Posted By kenneth house

PM? starter/generator

Since it is brushless and synchronous, i.e. frequency varies with speed, it would seem to be a permanent magnet rotor machine, with 3-phase wye winding plus neutral for the stator.

Looking at...
Showing results 1 to 35 of 41
 
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