Just realised there is an existing discussion about Boom going on over in Civil Av forum here;
viewtopic.php?f=3&t=1480203&start=50
I will join that conversation. Mods you can archive or delete this post
Anyone following the progress of 'Boom' and their flight test aircraft? For me, the Overture aircraft looks like a a technical feat, a 'Concorde junior' for sure, but also a money pit which is likely to go the way of the Aerion SSBJ (bankrupt) unless governmental support is secured. The flight test ...
Jump to postI worked on bid phase work for engineering systems on Irkut MC-21 and Comac (now CRAIC, I think) C929. What struck me was my employer(s) willingness to sell off-the-shelf components directly out of the Airbus/Boeing parts bin. Change a single part number on a placard and the part becomes new, free o...
Jump to postI'm confident that Boeing possesses, and contributes to the authoring of ARP4954. so there was no excuse for having a system which demanded DAL A flight control system rigor with only a single-failure-to-cat (runaway trim). It must have been caught and released by engineering, that's a very big obvi...
Jump to postAnybody have any experience with these? I believe I'm currently experiencing one, I work for Airbus. Generally consists of gaslighting, shaming, truman-show-esque following, smearing etc to try to convince the employee to leave. Another good allegory is the stapler guy in the film 'office space'. Wh...
Jump to postIDGs / CSDs are basically just generators with miniature hydrostatic-drives being the interface with the engine ancillary gearbox. Hydrostatic drives are also used on lawn tractors and big earth movers - all susceptible to the same issues; leakage, fluid degradation due to heat, particulate contamin...
Jump to postI thought this was part of the well-publicized Zodiac issues on A350? Is to be expected... but it will get better. Safran bought Zodiac, inherited all their sh.. I mean, portfolio.
Also, fair's fair, the Japanese supplier of lavatories for 787 had problems at entry into service too.
Sounds like an essay question ;) Here I'll have a go... I would say that electric vs hydraulic/pneumatic is not the key differentiator in terms of price. Of course there may be some impact to prices of sub-components at source of supply like semi-conductors, CPU processors, copper, lithium etc. but ...
Jump to postThere aren't really any 'typical' ratios - you've got to decide that yourself for your target speeds and select the ratios and number of gear teeth yourself. The Prius drivetrain simulator here used to work well for explaining three-way gearboxes. Won't currently work for me on my work computer. htt...
Jump to postI learned to fly in the US and am currently in the process of trying to convert to a UK licence, and I have to say it is not exactly straightforward. A UK flying club checkout is harder than an FAA checkride it seems, and the airman's knowledge test is a doddle in comparison to the 9 exams you have ...
Jump to postI took about $6000 and 18 months to do my FAA PPL at 26, and that was with a very supportive and economical flying club through my work. You cannot beat the Cessna employees flying club, save for joining the air force. All you need is time, money and persistence. But mostly money. and then a bit mor...
Jump to postMinor product improvements and evolutions aside,,in terms of changes since day one I would start with the AD list for the A320, each one of which would have resulted in some form of modification; https://www.faa.gov/regulations_policies/airworthiness_directives/search/?q=a320 From my own personal me...
Jump to postMustafa, I don't know much about aviation in Turkey but here's what I found; 1. Yes... https://akademi.thy.com/aboutus.aspx http://er-ah.net/EN/ http://www.halldale.com/node/12426#.WnHPpaqyq9g 2. Probably not, no. You will need to get your ratings and apply for them yourself. 3. Better get working a...
Jump to postGood article here: https://jetbroker.blog/2010/07/19/what-your-own-business-jet-really-costs-%E2%80%93-the-annual-budget-dissected-part-2-of-talking-turkey/ I think one of the clever distinctions made by those in the know, is that one does not simply 'own' a business jet, one sets up a front company...
Jump to postI think the sonic boom trouble is almost solved. Fuel efficiency of such a plane nowadays would also be far superior and make the plane capable of long range routes (eg, trans-Pacific). What I've heard of the Aerion design was that the boom is "solved" for low speeds only, i. e. Mach <1.3...
Jump to postThe only mature supersonic engines out there are all military, and if sourcing domestically Aerion and Boom will find that the US state department won't just hand them out for free, nor will they necessarily allow civilian development of them. My bet would be to try purchasing Russian powerplants, a...
Jump to postEngine driven pumps can overheat if the pressure compensator gets stuck, deadheading the pump, or if it's just excessively worn and you have very high case drain. Just two possibilities. Not sure what the exact issue is in this case, but at least A350 has Hyjet V which won't turn to sludge quite as ...
Jump to postIf it helps, we have the same acronym floating around in the project name for the landing gear too, it's just a copy and paste of Airbus extra wide body.
Jump to postIf the question is why airliners don't cruise at higher Mach - it's just drag and fuel. Also, with the advent of long range ETOPs, the designers have to optimise the payload-range diagram for a lower MTOW, pushing them to slower speeds to get the same range you might have achieved by carrying a lot ...
Jump to post787 architecture is to drive a generator, and then with the power from the generator, drive a compressor, which pressurises the cabin. Better for fume events, but more energy conversions means more losses, which means overall, it is less efficient... but the trend in industry is inexorable, you can ...
Jump to postHi SR380, I actually did my dissertation on this topic at Uni - Tupolev got further along with this technology than any other manufacturer, but Airbus also had a Cryoplane concept on the drawing board too. A Cryoplane is simply a plane fueled from a cryogenic fuel, i.e. liquid natural gas or liquid ...
Jump to postMLG on -900 & -1000 are completely different - from different manufacturers. -900 has the messier-dowty gear, -1000 has the goodrich gear. All the actuators, doors are unique to the gear, not interchangeable. One difference between them is, word has it -1000 has a pneumatically pressurised bogie...
Jump to postLooks like the original flightglobal article got deleted, the link no longer works... Too late, the internet has it now, original text; ----- Airbus has modified its A320neo to eliminate the characteristic ‘barking dog’ noise generated by the A320’s power transfer system during ground manoeuvring. T...
Jump to postSkywalker92, sounds like you are exploring the differences between open centre and closed centre had systems... There's a good resource here: <a href="http://daerospace.com/HydraulicSystems/index.php" target="_blank">http://daerospace.com/HydraulicSystems/index.php</a> ...for anyone who's interested...
Jump to postOne could argue that the envelope protection used on Airbus aircraft is a sort of STALL defeat device.....?! But if you're looking for examples of where logic based switching algorithms like the <acronym title="Aeromar (Mexico)">VW</acronym> 'emissions mode' on it's Bosch ECUs are used, the envelope...
Jump to postThe air asia accident bears striking parallels with AF447. This is a problem directly related to flight crew identification of, and appropriate flying in, alternate law. Airbus drivers are taught that they can fly full back stick in an emergency, that Airbus' are un-stallable, which simply isn't the...
Jump to postOh dear, a few mistaken interpretations above, BoeingFixer's got it right. <img border=0 src="http://cdn-www.airliners.net/aviation-forums/graphics/smilies/frown.gif" width="15" height="15" border="0"/> Easiest way to think of it is this; Open centre systems create constant flow*, variable pre...
Jump to postThe Aerion concept seems to be of the greatest merit thus far, and they are supposedly teamed up with Airbus to do design studies, but almost every airframer under the sun has had a go at a SSBJ concept publicly or in secret, including Dassault, Cessna, Gulfstream, Sukhoi, Lockheed, etc. etc. The cu...
Jump to postVideo here of another occurrence; https://www.youtube.com/watch?v=Oo_ujmwe9iM I'm not sure that this is a component that is routinely flight tested, RATs would be acceptance tested at the manufacturer, and then deployment tested on the ground at the airframer, if it's deployed in flight then somethi...
Jump to postThis sort of failure happened to A320 a few times due to the door actuators jamming. Fortunately this issue is all sorted now they got rid of all the bad door actuators and implemented an effective <acronym title="Avialeasing Aviation Co. (Uzbekistan)">AD</acronym>. <a href="http://news.aviation-saf...
Jump to postPersonally I wonder if this was another case of flying full back stick in alternate law like AF447. I personally disagree with full back stick flight protection philosophy precisely because of the risk encountered when the pilot, who is used to envelope protection, suddenly loses it upon entering al...
Jump to postI'm sure that landing gear wheel spacing is probably semi-standardised, based on optimal pavement loading and tyre sizing. Bear in mind too that neither Boeing nor Airbus 'make', landing gear, they buy their gears as complete shipsets from a fairly limited number of suppliers who all do things a sim...
Jump to postHi Kyle, Your best bet for researching this project will likely be to take a look at some of the many existing charter/fractional ownership companies which are out there; https://www.netjetseurope.com/ <a href="http://www.flexjet.com/" target="_blank">http://www.flexjet.com/</a> <a href="http://www....
Jump to postThe basis of the wild-frequency electrical system on the 787 is that the generators vary speed proportionally with engine speed, this dispenses with the need for a constant speed drive typically used on older electrical generators. The wild frequency output from a variable-speed generator can then b...
Jump to postA jet powered starship would be a very sexy aeroplane, but sadly the starship's death knell has already been sounded... no more will ever roll off the production line. However, here are the remaining few still flying... <a href="http://rps3.com/Pages/Starship.htm" target="_blank">http://rps3.com/Pag...
Jump to post<a href="http://investor.textron.com/newsroom/news-releases/press-release-details/2014/Textron-Completes-Acquisition-of-Beechcraft/default.aspx" target="_blank">http://investor.textron.com/newsroom...isition-of-Beechcraft/default.aspx</a> The Hawker Beechcraft demise has been a storied odyssey, from...
Jump to postA320- <a href="http://www.smartcockpit.com/aircraft-ressources/NORMAL_LAW_PROTECTIONS.html" target="_blank">http://www.smartcockpit.com/aircraft...ources/NORMAL_LAW_PROTECTIONS.html</a> A330- <a href="http://www.smartcockpit.com/aircraft-ressources/A_0-Flight_Laws.html" target="_blank">http://www.sm...
Jump to postAh my favourite topic <img src="http://cdn-www.airliners.net/aviation-forums/graphics/smilies/smile.gif" width="15" height="15" border="0"/> Nice answers from roseflyer but I'll join in and elaborate too... <table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face=...
Jump to post<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/metjetCEO" class="quote" target="_blank">metjetCEO</a> (<a href="#0" class="quote">Thread starter</a>):<br/><i> Why would Airbus design the hydr...
Jump to post<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/Woodreau" class="quote" target="_blank">Woodreau</a> (<a href="#6" class="quote">Reply 6</a>):<br/><i>The only two electric hydraulic pumps on t...
Jump to postAlso don't forget to mention the 787 - I believe it's gone with electric compressors instead of bleed air supposedly for improved efficiency, but incidentally it does also help to protect against fume events. The BAe 146 has had a lot of fume events due to the bleed air system, <a href="http://aerot...
Jump to postHi Jonas, I'll weigh in here with my own (jaded, biased) experiences... Firstly, I know nothing about the ATC route, but that obviously requires a specialised training path, I did a quick search and found this- <a href="http://www.prospects.ac.uk/air_traffic_controller_entry_requirements.htm" target...
Jump to postJust a theory but, if they had attempted to retract the gear with locking pins in, that would explain why the doors opened without the gear coming up. Did the NLG doors open too? Not sure why you would want to separately command the MLG doors to open on their own; this would only be possible if the ...
Jump to post<i><a href="/aviation-forums/tech_ops/read.main/153195" target="_blank">Can You Make A A330 Out Of A A340?</a></i> <font size="1">(by <a href="/profile/KrisYYZ" class="quote" target="_blank">KrisYYZ</a> May 5 2006 in Tech Ops)</font> ^ Some good answers in this thread where the same question was ask...
Jump to postMight sound obvious that it's a bad idea to mix phosphate esters and red oils, but I worked on an engine testbed project for a prominent french bizjet manufacturer where they wanted to do exactly that. Needless to say I warned them strongly against it. Never heard what the outcome was... As for Hyje...
Jump to post<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/>onebadlt123</a> (<a href=" class="quote">Reply 23</a>):<br/><i>Also note, an unmentioned benefit of a bleedless system is the reduced amounts o...
Jump to postThere's a nice landing gear powerpoint on the A380 here: <a href="http://www.fzt.haw-hamburg.de/pers/Scholz/dglr/hh/text_2008_06_05_LandingGear.pdf" target="_blank">http://www.fzt.haw-hamburg.de/pers/S...hh/text_2008_06_05_LandingGear.pdf</a> It discusses the design process that went into developing...
Jump to postSome nice thrust reverser CFD visualisation here, scroll down to page 15-
https://www.hpcuserforum.com/presentations/October2010China/RecentApplikcationsofCFDtotheDesignofBoeingCommercialTransports.pdf
If you did a structures-focused masters degree, fatigue/stress/loads etc, then your knowledge base is obviously best suited to a stress engineer type role, or possibly structural testing/NDT. Go on indeed.co.uk and search for 'aerospace stress engineer', there are hundreds of jobs. My impression of ...
Jump to postI don't imagine Airbus would let flight testing footage of that nature get out into public domain, the whole point of 'envelope protection' is supposed to be that they're unstallable. But I did find this- <a href="http://www.youtube.com/watch?v=wvHzvZJnqS4" target="_blank">http://www.youtube.com/wat...
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