tag:blogger.com,1999:blog-7553457216067299334.post3944567707563729433..comments2024-03-21T21:07:51.635-04:00Comments on All things 787: Boeing announces the start of final assembly on Dreamliner 6Ureshhttp://www.blogger.com/profile/10277326957559578045noreply@blogger.comBlogger40125tag:blogger.com,1999:blog-7553457216067299334.post-79197306490546704622009-03-24T08:04:00.000-04:002009-03-24T08:04:00.000-04:00Someone asked what ground vibration testing is. Th...Someone asked what ground vibration testing is. This is a very simple explanation. During a ground vibration test they will shake the airplane and measure how it responds. This is used to determine what its natural frequencies are (the frequency at which the structure resonates) and modeshapes (the shape the structure deforms to when it vibrates) as well as the damping in the structure (how quickly the energy from vibration is disipated). <BR/><BR/>This ground vibration test data is used to validate the dynamic modelling of the structure, and is particularly important for analysing flutter.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-80005478589667952762009-03-23T14:52:00.000-04:002009-03-23T14:52:00.000-04:00Testing should start in about a week or so I think...Testing should start in about a week or so I think.Ureshhttps://www.blogger.com/profile/10277326957559578045noreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-24882037582522440222009-03-23T14:36:00.000-04:002009-03-23T14:36:00.000-04:00Do you know when "gauntlet testing" is scheduled t...Do you know when "gauntlet testing" is scheduled to begin on Plane #1?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-53231046723319759102009-03-23T11:45:00.000-04:002009-03-23T11:45:00.000-04:00Thanks for your responses to the above slew of que...Thanks for your responses to the above slew of questions. It is helpful reading for us and and probably gives you some satisfaction that so many are reading your Blog.<BR/><BR/> We appreciate your efforts and answers!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-29838782996479011952009-03-22T16:27:00.000-04:002009-03-22T16:27:00.000-04:00Thanks for all your answers to all these questions...Thanks for all your answers to all these questions Uresh. It seems that you have a lot of work now dealing with so many questions. But is just as good for us reading them and learning so that we don't have to ask them in the future.<BR/>Keep up the good work.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-11436897204909666382009-03-22T14:55:00.000-04:002009-03-22T14:55:00.000-04:00Is Boeing being honest in its reports. In the past...Is Boeing being honest in its reports. In the past they said things were ok and then announced delays. How do they build back confidence?<BR/><BR/> Will each milestone be announced? Will there be any transparency in their reports on progress? Will we have to wait for the plane to fly before we know that they are telling the truth?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-50112768964035212832009-03-22T12:14:00.000-04:002009-03-22T12:14:00.000-04:00Do you think the supply chain has been adequately ...Do you think the supply chain has been adequately modified and rectified? Will the slow buildup of production allow for any further coordinated changes/adaptations, etc. Where are the weak links in the chainAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-49645699990496749832009-03-21T11:49:00.000-04:002009-03-21T11:49:00.000-04:00The above question has to do with the actual amoun...The above question has to do with the actual amount of flight time in the air.<BR/><BR/> What about the amount of time in "flight testing" on the ground before flying. Is there some expected period of time that is needed to complete these tests or is it simply the period of time it will take to accomplish the needed milestones.<BR/><BR/> Can you give us some frame of reference for both non flight and flight testing.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-41902842684220105062009-03-20T15:57:00.000-04:002009-03-20T15:57:00.000-04:00Thank you for all you concise and focused answers....Thank you for all you concise and focused answers. It has been quite interesting to read through the comments and responses...its almost like an expanded blog!<BR/><BR/> I guess the above covers many of the issues and facets of flight testing. <BR/><BR/> One more question...How long a period of time will it take to complete the flight testing. I read somewhere where close to 3100 hours of fight is required.<BR/><BR/> Please clarify ...thanks againAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-21535154597717416372009-03-20T15:40:00.000-04:002009-03-20T15:40:00.000-04:00The gauntlet testing is for testing all the softwa...The gauntlet testing is for testing all the software and systems integration so that everything is running together before first flight. All this will happen to minimize any surprises during flight test.<BR/><BR/>That's all I can tell you. Will there be challenges during flight tests...yes. Do I know what they'll be...no.Ureshhttps://www.blogger.com/profile/10277326957559578045noreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-21813929960700652672009-03-20T15:35:00.000-04:002009-03-20T15:35:00.000-04:00Many people I know think that there can be some su...Many people I know think that there can be some surprises from the software system and its integration.<BR/><BR/> Would you care to comment on this aspect of the plane and its test flight. <BR/><BR/> Doesn't alot of the program get tested during the gauntlet period...under circumstances as if it were in flight...<BR/><BR/> But flight must present other challenges...could you clarify this aspect of the 787Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-76308741018918280042009-03-20T14:43:00.000-04:002009-03-20T14:43:00.000-04:00In my opinion, I don't think there will be a major...In my opinion, I don't think there will be a major issue that will be uncovered by flight testing. The underlying technology has been tested long before the 787 was conceived. It's all now coming together.Ureshhttps://www.blogger.com/profile/10277326957559578045noreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-51836825071286088142009-03-20T14:38:00.000-04:002009-03-20T14:38:00.000-04:00Uresh, could we see a major ?....One cannot measu...Uresh, could we see a major ?....One cannot measure the unknown but there must be some intuitive thoughts here...Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-30901836969049473692009-03-20T14:20:00.000-04:002009-03-20T14:20:00.000-04:00I really doubt that there would be any problems li...I really doubt that there would be any problems like what you're describing. I have know idea what kind of unknown problems could crop up, I guess that's why they're called unknown unknowns.Ureshhttps://www.blogger.com/profile/10277326957559578045noreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-17067721060706640162009-03-20T14:17:00.000-04:002009-03-20T14:17:00.000-04:00In an earlier response to someone, you indicated t...In an earlier response to someone, you indicated that you thought Boeing had possibly caught most of the larger possible problems.<BR/><BR/> I realize that there is no such thing as 100% guarantee, but what sort of major unknowns could crop up...and could they be "significant". That is, could there be a major breech of the system, or would there be a teeth rattling flutter, or the exterior starts to crack, etc.<BR/><BR/> With all the planning and delays, etc and simulations, what type of possibilities are there?<BR/><BR/> (If there was a major retrofit, the stock would crater worse than it already has and all the Officers should be fired)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-41272964856189794112009-03-20T14:01:00.000-04:002009-03-20T14:01:00.000-04:00All programs at this point have risk. In my opinio...All programs at this point have risk. In my opinion the greatest risk to the 787 program is not in the ramp up to production or the suppliers adjusting to producing the standard non test flight 787s, rather it's theunknown unknowns that will come out during flight testing. It's hard to quantify something like that.Ureshhttps://www.blogger.com/profile/10277326957559578045noreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-52525575143555128312009-03-20T11:53:00.000-04:002009-03-20T11:53:00.000-04:00Many shareholders have a lack of confidence in the...Many shareholders have a lack of confidence in the present management and evolution of the 787 program. Years behind and riddled with failures, delays and a supply chain that falls all over itself. the Officers of Boeing have done a terrible job. As transparent as they said they would be, they were not and misled.<BR/><BR/> Can the 787 program overcome the obstacles of poor managementAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-16754411059266945172009-03-20T11:32:00.000-04:002009-03-20T11:32:00.000-04:00It sounds like there is still a reasonable amount ...It sounds like there is still a reasonable amount of risk in front of the 787 program...both in the flight testing and on the production side.<BR/><BR/> Given the record of slips and failures, why should one have confindence that they will get through the flight tests without glitches as well as ordering the supply line with dicipline and efficiencyAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-53110147714909107922009-03-20T11:17:00.000-04:002009-03-20T11:17:00.000-04:00! nad 2 have most of their fasteners that need to ...! nad 2 have most of their fasteners that need to be replaced already done. The 6 test airplanes will havesome more fastener rework to be done after the test flight program but those fasteners are in non-critical areas and do not represent a safety offlight issue.Ureshhttps://www.blogger.com/profile/10277326957559578045noreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-75321286643322986122009-03-20T11:14:00.000-04:002009-03-20T11:14:00.000-04:00Are you optimistic that the supply chain has learn...Are you optimistic that the supply chain has learned its lessons and can absorb these changes of specs, etc.<BR/><BR/> Or is this a big challenge and the answer will not be known until their performance reveals it.<BR/><BR/> I understand you cannot predict the future..but the question is how confident are you in their adaptabilityAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-82949610065513338332009-03-20T11:11:00.000-04:002009-03-20T11:11:00.000-04:00When do you think the fastener problems will be co...When do you think the fastener problems will be completed on planes 3-6? By the time the testing takes place or the flying takes place.<BR/><BR/> From your answer, I gather plane 1 & 2 are free of the problem<BR/><BR/> Can you comment on the overall problem of the fastners..i.e. in control...delaying ...problematic..will not interfere with certification. etcAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-54144655927109909012009-03-20T10:01:00.000-04:002009-03-20T10:01:00.000-04:00For the most part the supply chain has settled dow...For the most part the supply chain has settled down but now they're moving into production of airline deliverable airplanes so that going to present a new set of challenges for them and Boeing. There's been changed specs and lessons learned that have to flow throughout the supply chain so the next 12 months will be critical in terms of ramping up the production rate.Ureshhttps://www.blogger.com/profile/10277326957559578045noreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-58265116415622079722009-03-20T09:58:00.000-04:002009-03-20T09:58:00.000-04:00They'll probably will make some sort of announceme...They'll probably will make some sort of announcement when they start final assembly on that airplane (LN 7). Beyond that I don't think so.Ureshhttps://www.blogger.com/profile/10277326957559578045noreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-78809114208008605162009-03-20T09:56:00.000-04:002009-03-20T09:56:00.000-04:00No not all. They still have fastener rework going...No not all. They still have fastener rework going on on planes 3 to 6 and beyond. The suppliers are taking care of the most of them while Boeing took care of the rework in planes 1 to 4 but it still an ongoing thing.Ureshhttps://www.blogger.com/profile/10277326957559578045noreply@blogger.comtag:blogger.com,1999:blog-7553457216067299334.post-1332580424337604402009-03-20T09:43:00.000-04:002009-03-20T09:43:00.000-04:00From your understanding, Has the supply chain heal...From your understanding, Has the supply chain healed its weaknesses and has it returned to normalized production supply without flaws in the products. <BR/><BR/> healed in the sense of functioning at the present level smoothly and orderly.Anonymousnoreply@blogger.com