Search found 823 matches

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by wingscrubber
Mon Nov 12, 2018 2:57 pm
Forum: Technical/Operations
Topic: Common IDG issue
Replies: 13
Views: 2453

Re: Common IDG issue

IDGs / 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...

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by wingscrubber
Mon Jul 09, 2018 3:55 pm
Forum: Technical/Operations
Topic: Airbus A350 Toilet Issue
Replies: 9
Views: 2176

Re: Airbus A350 Toilet Issue

I 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.

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by wingscrubber
Mon Jul 09, 2018 3:34 pm
Forum: Technical/Operations
Topic: How will the More Electric Aircraft trend affect the market value of electrical aircraft components?
Replies: 2
Views: 484

Re: How will the More Electric Aircraft trend affect the market value of electrical aircraft components?

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 ...

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by wingscrubber
Tue Feb 20, 2018 2:31 pm
Forum: Technical/Operations
Topic: Typical Epicyclic gear ratios
Replies: 10
Views: 823

Re: Typical Epicyclic gear ratios

There 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...

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by wingscrubber
Tue Feb 13, 2018 1:01 pm
Forum: Technical/Operations
Topic: LAPL to PPL Conversion
Replies: 8
Views: 1587

Re: LAPL to PPL Conversion

I 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 ...

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by wingscrubber
Mon Feb 05, 2018 1:24 pm
Forum: Technical/Operations
Topic: Almost 30 and want to start flying. Questions.
Replies: 15
Views: 1993

Re: Almost 30 and want to start flying. Questions.

I 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...

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by wingscrubber
Wed Jan 31, 2018 2:47 pm
Forum: Technical/Operations
Topic: Source for A320-200 Detailed Type Design Drawings
Replies: 4
Views: 806

Re: Source for A320-200 Detailed Type Design Drawings

Minor 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...

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by wingscrubber
Wed Jan 31, 2018 2:23 pm
Forum: Technical/Operations
Topic: General questions
Replies: 2
Views: 567

Re: General questions

Mustafa, 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...

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by wingscrubber
Fri Sep 01, 2017 9:40 am
Forum: Technical/Operations
Topic: Cost of owning a private jet?
Replies: 27
Views: 6380

Re: Cost of owning a private jet?

Good 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...

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by wingscrubber
Fri Sep 01, 2017 9:06 am
Forum: Technical/Operations
Topic: Largest problem for SST: Boom or fuel efficiency?
Replies: 8
Views: 1501

Re: Largest problem for SST: Boom or fuel efficiency?

I 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...

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by wingscrubber
Fri Sep 01, 2017 9:00 am
Forum: Technical/Operations
Topic: Largest problem for SST: Boom or fuel efficiency?
Replies: 8
Views: 1501

Re: Largest problem for SST: Boom or fuel efficiency?

The 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...

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by wingscrubber
Fri Sep 01, 2017 8:49 am
Forum: Technical/Operations
Topic: A350 urgent EASA directive - hydraulic pump fire danger
Replies: 38
Views: 12773

Re: A350 urgent EASA directive - hydraulic pump fire danger

Engine 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 ...

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by wingscrubber
Fri Sep 01, 2017 8:45 am
Forum: Technical/Operations
Topic: RR Trent XWB - does XWB stand for anything?
Replies: 15
Views: 3105

Re: RR Trent XWB - does XWB stand for anything?

If 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.

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by wingscrubber
Fri Sep 01, 2017 8:37 am
Forum: Technical/Operations
Topic: Why can't planes fly faster?
Replies: 19
Views: 4158

Re: Why can't planes fly faster?

If 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 ...

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by wingscrubber
Thu Jan 05, 2017 9:52 pm
Forum: Technical/Operations
Topic: Bleed Vs. Non-Bleed Engines
Replies: 37
Views: 13599

Re: Bleed Vs. Non-Bleed Engines

787 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 ...

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by wingscrubber
Thu Jan 05, 2017 9:42 pm
Forum: Technical/Operations
Topic: Cryogenic Fuel On Aircrafts
Replies: 16
Views: 3027

Re: Cryogenic Fuel On Aircrafts

Hi 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 ...

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by wingscrubber
Fri Dec 16, 2016 4:07 pm
Forum: Technical/Operations
Topic: Differences Between A350-900 And A350-1000
Replies: 42
Views: 13976

Re: Differences Between A350-900 And A350-1000

MLG 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...

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by wingscrubber
Wed Jun 15, 2016 7:09 pm
Forum: Civil Aviation
Topic: Airbus Muzzles The Barking Dog
Replies: 59
Views: 14725

Re: Airbus Muzzles The Barking Dog

Looks 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...

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by wingscrubber
Fri Apr 15, 2016 6:28 pm
Forum: Technical/Operations
Topic: Hydraulic Pumps In Aircraft
Replies: 46
Views: 25959

RE: Hydraulic Pumps In Aircraft

Skywalker92, 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...

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by wingscrubber
Fri Apr 15, 2016 5:21 pm
Forum: Technical/Operations
Topic: Are Defeat Devices Possible In Airliners?
Replies: 10
Views: 4767

RE: Are Defeat Devices Possible In Airliners?

One 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...

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by wingscrubber
Wed Dec 02, 2015 10:49 pm
Forum: Technical/Operations
Topic: Stall Recovery
Replies: 20
Views: 4214

RE: Stall Recovery

The 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...

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by wingscrubber
Sun Nov 01, 2015 8:47 pm
Forum: Technical/Operations
Topic: Hydraulics
Replies: 12
Views: 5203

RE: Hydraulics

Oh 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...

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by wingscrubber
Wed Jul 08, 2015 10:20 pm
Forum: Technical/Operations
Topic: Supersonic Business Jets?
Replies: 27
Views: 6385

RE: Supersonic Business Jets?

The 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...

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by wingscrubber
Wed Jul 08, 2015 9:27 pm
Forum: Technical/Operations
Topic: RAT Question
Replies: 16
Views: 4612

RE: RAT Question

Video 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...

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by wingscrubber
Sun Feb 01, 2015 10:49 pm
Forum: Technical/Operations
Topic: Procedure In A Landing Gear Failure
Replies: 9
Views: 5203

RE: Procedure In A Landing Gear Failure

This 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...

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by wingscrubber
Sun Feb 01, 2015 10:36 pm
Forum: Technical/Operations
Topic: AirAsia Crash: Climb Rate Question
Replies: 19
Views: 4179

RE: AirAsia Crash: Climb Rate Question

Personally 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...

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by wingscrubber
Mon Dec 01, 2014 8:24 pm
Forum: Technical/Operations
Topic: Undercarriage Design: Boeing V. Airbus
Replies: 7
Views: 6749

RE: Undercarriage Design: Boeing V. Airbus

I'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...

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by wingscrubber
Tue Nov 25, 2014 11:14 pm
Forum: Technical/Operations
Topic: Academic Project-Private Jets
Replies: 1
Views: 3561

RE: Academic Project-Private Jets

Hi 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....

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by wingscrubber
Sun Oct 19, 2014 11:21 am
Forum: Technical/Operations
Topic: Electrical Systems On New Airplanes
Replies: 3
Views: 3318

RE: Electrical Systems On New Airplanes

The 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...

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by wingscrubber
Wed Oct 08, 2014 9:19 pm
Forum: Technical/Operations
Topic: Could The Starship Come Back As A Jet?
Replies: 21
Views: 9561

RE: Could The Starship Come Back As A Jet?

A 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...

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by wingscrubber
Thu Sep 18, 2014 8:48 pm
Forum: Technical/Operations
Topic: Is It Too Late For A Beechcraft 2000 Successor
Replies: 13
Views: 5342

RE: Is It Too Late For A Beechcraft 2000 Successor

<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...

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by wingscrubber
Thu Sep 18, 2014 8:30 pm
Forum: Technical/Operations
Topic: Normal Law? Direct Law? Can Someone Explain?
Replies: 16
Views: 30164

RE: Normal Law? Direct Law? Can Someone Explain?

A320- <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...

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by wingscrubber
Sun Aug 17, 2014 11:45 pm
Forum: Technical/Operations
Topic: Hydraulic Circuits: Where To Find An Overview?
Replies: 6
Views: 3980

RE: Hydraulic Circuits: Where To Find An Overview?

Ah 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=...

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by wingscrubber
Sat Aug 09, 2014 8:39 pm
Forum: Technical/Operations
Topic: A320 Hydraulic Pumps
Replies: 21
Views: 10244

RE: A320 Hydraulic Pumps

<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...

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by wingscrubber
Sat Aug 09, 2014 8:05 pm
Forum: Technical/Operations
Topic: A320 Hydraulic Pumps
Replies: 21
Views: 10244

RE: A320 Hydraulic Pumps

<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...

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by wingscrubber
Fri Apr 04, 2014 1:55 pm
Forum: Technical/Operations
Topic: Origins Of Bleed Air For Pressurisation
Replies: 4
Views: 4882

RE: Origins Of Bleed Air For Pressurisation

Also 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...

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by wingscrubber
Sun Jan 12, 2014 3:50 am
Forum: Technical/Operations
Topic: Education / Engineering / ATC
Replies: 5
Views: 2628

RE: Education / Engineering / ATC

Hi 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...

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by wingscrubber
Sat Dec 14, 2013 5:09 pm
Forum: Technical/Operations
Topic: 787-9 Gear Door. Updates?
Replies: 11
Views: 8080

RE: 787-9 Gear Door. Updates?

Just 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 ...

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by wingscrubber
Wed Dec 11, 2013 8:41 pm
Forum: Technical/Operations
Topic: A340 To A330 Conversion?
Replies: 11
Views: 7247

RE: A340 To A330 Conversion?

<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...

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by wingscrubber
Thu Dec 05, 2013 10:54 pm
Forum: Technical/Operations
Topic: Skydrol VS. HyJet?
Replies: 5
Views: 11024

RE: Skydrol VS. HyJet?

Might 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...

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by wingscrubber
Sun Dec 01, 2013 10:37 pm
Forum: Technical/Operations
Topic: Bleed Vs. Non-Bleed Engines
Replies: 37
Views: 13599

RE: Bleed Vs. Non-Bleed Engines

<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...

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by wingscrubber
Sun Dec 01, 2013 9:59 pm
Forum: Technical/Operations
Topic: Landing Gear Questions
Replies: 4
Views: 5700

RE: Landing Gear Questions

There'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...

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by wingscrubber
Sun Oct 13, 2013 2:48 pm
Forum: Technical/Operations
Topic: Reverse Thrust Induced Turbulence On Tails
Replies: 6
Views: 4889

RE: Reverse Thrust Induced Turbulence On Tails

Some nice thrust reverser CFD visualisation here, scroll down to page 15-
https://www.hpcuserforum.com/presentations/October2010China/RecentApplikcationsofCFDtotheDesignofBoeingCommercialTransports.pdf

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by wingscrubber
Sun Oct 13, 2013 2:24 pm
Forum: Technical/Operations
Topic: What Are The Duties Of An Aerospace Engineer?
Replies: 15
Views: 8478

RE: What Are The Duties Of An Aerospace Engineer?

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 ...

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by wingscrubber
Thu Jun 20, 2013 6:58 pm
Forum: Technical/Operations
Topic: AF447 And Airbus Flight Testing
Replies: 21
Views: 8893

RE: AF447 And Airbus Flight Testing

I 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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by wingscrubber
Thu May 23, 2013 1:06 am
Forum: Technical/Operations
Topic: Geodetic/geodesic Construction: Why Not?
Replies: 3
Views: 4073

RE: Geodetic/geodesic Construction: Why Not?

No reason why geodesic structure can't be used on modern aircraft, it's just that most modern aircraft (pressurized or not) all seem to be designed with semi-monocoque stressed skin structures, which results in metal/composite panels with stringers/longerons and no need for a geodesic framework. The...

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by wingscrubber
Tue May 14, 2013 9:08 am
Forum: Technical/Operations
Topic: One Engine Cruise
Replies: 46
Views: 7727

RE: One Engine Cruise

A lot of negative in this thread! This concept is achievable, but the motivation and benefit for doing so is the question. I think the best example of auxiliary engines shut-down in flight is the B-36 peacemaker, which augmented the props with 4 turbojets, but the only reason for doing so was the li...

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by wingscrubber
Tue May 14, 2013 8:09 am
Forum: Technical/Operations
Topic: Cessna Citation Training
Replies: 14
Views: 4365

RE: Cessna Citation Training

The small Citations are single-pilot certified, so you won't be 'needed' necessarily, but if the captain is instructor rated then you can log some twin turbine time - only question is the cost? Citation instruction time is not cheap, but if you're able to 'tag along' free of charge somehow that woul...

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by wingscrubber
Sat May 04, 2013 6:27 pm
Forum: Civil Aviation
Topic: Boeing To Build World's Longest-range Airliner
Replies: 175
Views: 43563

RE: Boeing To Build World's Longest-range Airliner

Passengers don't want more range at Mach 0.8, the experience is already miserable enough, worth sedating yourself for. Refueling stops are welcome respite for any flights over 9 hours - What's needed is more speed! But that'll never happen.
Such a depressing era to be an aerospace engineer.

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by wingscrubber
Mon Apr 29, 2013 2:14 am
Forum: Technical/Operations
Topic: How Does Fly-by-wire Work?
Replies: 18
Views: 10296

RE: How Does Fly-by-wire Work?

Fly-by-wire is meant to be taken to mean 'control-by-wire', whereby hydraulic servo-actuators are commanded electronically rather than mechanically with pushrod or cable, but the misconception is that 'fly-by-wire' aircraft are also 'power-by-wire', which is not the case. (Fly-by-light is another va...

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