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Search: Posts Made By: EEngr
Showing results 1 to 35 of 52
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Forum: Rumours & News
2nd Jan 2015, 19:30
Replies: 2,185
Views: 1,032,226
Posted By EEngr

According to the report cited in #2162, the...

According to the report cited in #2162, the battery in question has a manufacturing date of May 9, 2013. And a failure approximately 7 months later.

We can assume that the fleet-wide age of all...
Forum: Rumours & News
9th Sep 2014, 20:37
Replies: 2,185
Views: 1,032,226
Posted By EEngr

tdracer...

tdracer (http://www.pprune.org/members/414340-tdracer)

Are they reporting single power system failures now? Or collecting extra data for the 787 batteries as an interim check on the status of the...
Forum: Rumours & News
5th Sep 2014, 00:51
Replies: 2,185
Views: 1,032,226
Posted By EEngr

manrow...

manrow (http://www.pprune.org/members/118794-manrow)

One of the battery fixes was to tighten up the charge/discharge limits in the firmware. Its possible that this may have made some difference in...
Forum: Rumours & News
6th Aug 2014, 14:40
Replies: 2,185
Views: 1,032,226
Posted By EEngr

I concur. In my experience they do seem to be...

I concur. In my experience they do seem to be overworked, particularly in the manufacturing oversight area. I suppose Boeing, in conjunction with Congress, works to keep their funding down to levels...
Forum: Rumours & News
6th Aug 2014, 11:40
Replies: 2,185
Views: 1,032,226
Posted By EEngr

I don't think the forward and aft equipment bays...

I don't think the forward and aft equipment bays get that cold. Its pressurized and conditioned air in there. Probably close to the temps one would expect in the cargo spaces.
Forum: Rumours & News
16th Jan 2014, 17:48
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Yes. But discharged to what level? Since the...

Yes. But discharged to what level? Since the battery (main) is part of a critical backup system (brakes), there is a requirement to maintain it to some minimum level of charge. Because there are...
Forum: Rumours & News
13th Jul 2013, 02:37
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Wrong icon. Try :{

Wrong icon. Try :{
Forum: Rumours & News
10th Jul 2013, 14:27
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Because that root cause might be due to Boeing's...

Because that root cause might be due to Boeing's offloading too much systems design and manufacturing responsibility onto subcontractors. And the fix might reverse Boeing Corporate's current policies...
Forum: Rumours & News
4th Jul 2013, 23:59
Replies: 2,185
Views: 1,032,226
Posted By EEngr

And there lies a really important question....

And there lies a really important question. Having an open-ended investigation into batteries, electrical panels, loose bolts, etc. might lead regulators to a root cause that Boeing won't like. And...
Forum: Rumours & News
4th Jul 2013, 17:13
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Yes. And McDonnell-Douglas is too well connected...

Yes. And McDonnell-Douglas is too well connected to fail. Hence the quick merger when McD-D lost its position in the three way fighter bid. Boeing should have picked up only the pieces it wanted in...
Forum: Rumours & News
2nd Jul 2013, 21:05
Replies: 2,185
Views: 1,032,226
Posted By EEngr

I am joking, no. This is the position that the...

I am joking, no. This is the position that the FAA and Boeing have taken. And its not entirely unreasonable given the goal of getting the planes declared airworthy ASAP. A battery fire has now been...
Forum: Rumours & News
2nd Jul 2013, 16:11
Replies: 2,185
Views: 1,032,226
Posted By EEngr

The key word here is potential. By Boeing's own...

The key word here is potential. By Boeing's own admission, they don't understand the root cause yet. 'Yet' being my own addition, as I haven't heard that they will continue to look. The Big Battery...
Forum: Rumours & News
2nd Jul 2013, 15:55
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Why? The danger has been averted. Even if nobody...

Why? The danger has been averted. Even if nobody understands what is going on within the battery box, the aircraft should be safe regardless.
Forum: Rumours & News
30th Jun 2013, 19:21
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Sadly, this is probably true. I don't thing...

Sadly, this is probably true. I don't thing building to regulations always results in a quality product.

But these problems are different in one significant way: For the Rolls engines we (Rolls,...
Forum: Rumours & News
13th Jun 2013, 19:04
Replies: 2,185
Views: 1,032,226
Posted By EEngr

That IS the root cause.

That IS the root cause.
Forum: Rumours & News
16th May 2013, 15:14
Replies: 2,185
Views: 1,032,226
Posted By EEngr

captjns I assume that the proposed two hour...

captjns

I assume that the proposed two hour limit (ETOPS 120) is based upon the reliability (or lack thereof) of the APU as an alternate source. The safety issues have been addressed with the...
Forum: Rumours & News
14th May 2013, 15:07
Replies: 2,185
Views: 1,032,226
Posted By EEngr

ATC Watcher...

ATC Watcher (http://www.pprune.org/members/2112-atc-watcher)

This may turn out to be where most of the interesting changes will occur. Will the FAA revisit their ODA (Organization Designation...
Forum: Rumours & News
6th Apr 2013, 16:19
Replies: 2,185
Views: 1,032,226
Posted By EEngr

MWorth...

MWorth (http://www.pprune.org/members/399588-mworth)

Well then I hope they can demonstrate the level of reliability needed to justify extending ETOPS operations. Problem is: After putting in a...
Forum: Rumours & News
5th Apr 2013, 18:27
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Has it? I wasn't aware that the root cause...

Has it?

I wasn't aware that the root cause of the battery failures had been identified. There are some hypothesis, and battery monitoring and charging algorithms are among some of the better ones....
Forum: Rumours & News
3rd Apr 2013, 21:02
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Not just identify, but quantify. And asses the...

Not just identify, but quantify. And asses the impact of the abatement. When it comes down to basics, the only common denominator for risk/impact assessment is cost. Something Boeing was adverse to...
Forum: Rumours & News
2nd Apr 2013, 18:32
Replies: 2,185
Views: 1,032,226
Posted By EEngr

They are just laying the PR groundwork for more...

They are just laying the PR groundwork for more H-1B visas.

Back in the old days, Boeing used to build furniture just to keep their skilled carpenters busy during downturns. And hydrofoils,...
Forum: Rumours & News
25th Mar 2013, 19:45
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Hmm

Boeing #272 Flight Tracker (http://uk.flightaware.com/live/flight/BOE272)

At the moment, it appears to be heading out over water instead of close to the coast.

I hope there's nothing they need...
Forum: Rumours & News
25th Mar 2013, 19:39
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Anyone have the details of the box and...

Anyone have the details of the box and ventilation design handy?

Will this box be sealed during normal operations? Or will there be positive ventilation overboard through an outflow port?
Forum: Rumours & News
22nd Mar 2013, 22:09
Replies: 2,185
Views: 1,032,226
Posted By EEngr

FlightPathOBN...

FlightPathOBN (http://www.pprune.org/members/351467-flightpathobn):

It looks like Boeing is trying to mount a PR initiative against the NTSB's cautious approach. After all, its the FAA that will...
Forum: Rumours & News
20th Mar 2013, 03:48
Replies: 2,185
Views: 1,032,226
Posted By EEngr

ozaub...

ozaub (http://www.pprune.org/members/210563-ozaub):

Boeing just put the battery in a heavy box and redefined 'safe'. Now, if one cell runs away, its still safe. Since the surrounding components...
Forum: Rumours & News
14th Mar 2013, 16:07
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Pub User...

Pub User (http://www.pprune.org/members/23192-pub-user)

In other words: Fiddle with everything (including a few things that have been ruled out already) and hope something works.

Which is just...
Forum: Rumours & News
12th Mar 2013, 16:44
Replies: 2,185
Views: 1,032,226
Posted By EEngr

sky9 (http://www.pprune.org/members/7001-sky9) ...

sky9 (http://www.pprune.org/members/7001-sky9)

Which makes me wonder about this:

Its possible that this V-P may have gone 'off reservation' to soothe the customers. Or there is a deeper split...
Forum: Rumours & News
7th Mar 2013, 16:34
Replies: 2,185
Views: 1,032,226
Posted By EEngr

lomapaseo...

lomapaseo (http://www.pprune.org/members/48942-lomapaseo);

A combination of failures that lead to the loss of the aircraft. But in general terms, it depends on what you are concerned with. The...
Forum: Rumours & News
6th Mar 2013, 19:40
Replies: 2,185
Views: 1,032,226
Posted By EEngr

HazelNuts39...

HazelNuts39 (http://www.pprune.org/members/305001-hazelnuts39):

I don't think you want to cut probabilities that close when it comes to critical systems. The difference between ETOPS/non-ETOPS...
Forum: Rumours & News
6th Mar 2013, 16:14
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Grrr Is ETOPS dependent on starting the APU? I don't...

Is ETOPS dependent on starting the APU? I don't think so, as dispatch with an inop APU is allowed (or so I've been told).

Battery capacity doesn't extend the range of the aircraft. That is done by...
Forum: Rumours & News
5th Mar 2013, 19:38
Replies: 2,185
Views: 1,032,226
Posted By EEngr

galaxy flyer...

galaxy flyer (http://www.pprune.org/members/62324-galaxy-flyer):

The mountains are high and the emperor is far away.
Forum: Rumours & News
2nd Mar 2013, 16:08
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Joetom...

Joetom (http://www.pprune.org/members/109951-joetom):

There are several entities involved in this chain of responsibility: Boeing, Thales, GSYuasa, Securaplane. Remind me if I've left anyone out....
Forum: Rumours & News
28th Feb 2013, 23:54
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Momoe...

Momoe (http://www.pprune.org/members/231371-momoe);

Not so close to the edge during flight tests. Subsystems are usually pushed much harder during bench (lab) testing. And therein lies a possible...
Forum: Rumours & News
27th Feb 2013, 02:36
Replies: 2,185
Views: 1,032,226
Posted By EEngr

LiON Requirement

quoting Mike Sinnet, VP of Engineering and chief project engineer for the 787:

Which function (backup braking or APU start) places the greater demand on the battery system? I'll venture a guess...
Forum: Rumours & News
24th Feb 2013, 17:15
Replies: 2,185
Views: 1,032,226
Posted By EEngr

Momoe...

Momoe (http://www.pprune.org/members/231371-momoe)

No, and yes (more or less).

The design and manufacturing of the various components of the battery systems were outsourced. So the "put it in a...
Showing results 1 to 35 of 52
 
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