787 Cleared To Fly Again
Back to Forum- This topic has 20 replies, 11 voices, and was last updated 16 May 2013
at 17:05 by HarryMonk.
-
- Author
- Posts
- Skip to last reply Create Topic
-
BucksnetParticipanthttp://www.faa.gov/news/press_releases/news_story.cfm?newsId=14554
Good news, and I hope there are no more problems.
19 Apr 2013
at 19:45
HedgeFundFlyerParticipantIndeed.
I was told that BA are taking delivery of three of these in Q3 and another one in Q4.
Is that still happening?
I gather production has been kept up but that, obviously, test flights are now way behind schedule.
19 Apr 2013
at 20:15
InquisitiveParticipantSurely Boeing has to present definitive root cause analysis and proper mitigation to FAA, otherwise they will not be allow to fly.
There the at least 3 layers of protection to the batteries. First the design shall ensure enough ampere-hour (juice) is available for the load and type of battery (Ni-Cad or others) electrolyte is good for no thermal runaway. It looks like some amount of thermal runaway happened. The second is limit on charging voltage so as to allow no overcharging. And thirdly, if thermal runaway happens, the battey enclosure shall be good enough to contain the fire. Although there was minor fire, but in essence the battery enclosures saved the day.
The above problems can be resolved. All modern planes rely heavily on batteries.
These problems can b fixed and I am sure Boeing is22 Apr 2013
at 12:32
InquisitiveParticipantSurely Boeing has to present definitive root cause analysis and proper mitigation to FAA, otherwise they will not be allow to fly.
There the at least 3 layers of protection to the batteries. First the design shall ensure enough ampere-hour (juice) is available for the load and type of battery (Ni-Cad or others) electrolyte is good for no thermal runaway. It looks like some amount of thermal runaway happened. The second is limit on charging voltage so as to allow no overcharging. And thirdly, if thermal runaway happens, the battey enclosure shall be good enough to contain the fire. Although there was minor fire, but in essence the battery enclosures saved the day.
The above problems can be resolved. All modern planes rely heavily on batteries.
These problems can b fixed and I am sure Boeing is22 Apr 2013
at 12:32
VintageKrugParticipantYou can be certain that is a similar issue had afflicted an airbus, the FAA would not have jumped through so many hoops to re-certify as fast as it has.
22 Apr 2013
at 12:35
RockhopperParticipantThe BBC is today quoting Larry Loftis, who is the programme manager for the 787, saying “It is possible we will never know the root cause. It is not uncommon not to have found the single root cause. So industry practice is to look at all the potential causes and address all of them.”
I am not an engineer but that just seems like PR speak for “We don’t know what the issue is but we hope we fixed it.”
I just hope the FAA have made the right call with re-certification
22 Apr 2013
at 14:30
BigDog.Participant“It is possible we may never know the root cause.”
The fix ….
Improved batteries which don’t have to work so hard + stainless steel boxes severely limit oxygen + external ventilation pipe if system fails.22 Apr 2013
at 18:44
BA319131ParticipantVK, they can only be blue or grey, something to do with the way the air flows over the nacelle, anything else will increase the fuel consumption. Given BA’s A380 paint was only the thickness of a human hair I had hoped this might be suitable, at this point appears not – that said, the aircraft is on the paint shop now being finished off……
22 Apr 2013
at 18:55 -
AuthorPosts
