Search found 119 matches

by SteinarN
Wed Nov 28, 2018 1:13 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

Looks like question I was going to answer was answered while I was writing this post............ From a general engineering viewpoint , its nearly always a low control voltage of 12/24v operating a contactor , which then starts/stops a higher voltage - 110/240 V to a actuator. Too dangerous to have...

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by SteinarN
Wed Nov 28, 2018 8:39 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

I have never flown an aircraft with electrical trim. The trim cutout switches, do they directly electrical isolate the trim motors, or do they inhibit a command or work on a contactor for example? The trim cutout switches removes the positive supply to the trim motor contactor coil. Cutout switches...

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by SteinarN
Wed Nov 28, 2018 7:16 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

@AirlineCritic
I too noted all those heading changes from the tower. Seems it was a lot going on in the cockpit.

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by SteinarN
Wed Nov 28, 2018 6:31 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

Just a quick reply. From the report on side 12 it shows cc communicating "normally" with the tower just 19 seconds before end of recording/impact with sea. It seems like cc wasnt aware they were in a near vertical dive? Furter cc stated they could not determine speed nor altitude as all th...

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by SteinarN
Fri Nov 16, 2018 5:11 pm
Forum: Civil Aviation
Topic: Airbus And Boeing 2018 Orders
Replies: 604
Views: 154396

Re: Airbus And Boeing 2018 Orders

I think airbus is quite happy for such a conversion.Frees up A350 slots enabling them to offer more nearish term slots for new A350 campaign while they get more needed work for the A330 line.

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by SteinarN
Wed Nov 14, 2018 3:10 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

PixelFlight wrote:
U.S. FAA launches high-priority probe of Boeing's safety analyses -WSJ


Do you have a link for this article?

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by SteinarN
Tue Nov 13, 2018 9:09 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangal Pinang

Two other quote from the same article; "Boeing is working on a software fix, according to industry and government officials, that would likely mitigate risks. On Saturday, the company went further than before in spelling out dangers pilots can face if they misinterpret or respond too slowly to ...

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by SteinarN
Tue Nov 13, 2018 9:02 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangal Pinang

Some very interesting quotes from a WSJ article; "The focus of the probe is shifting away from its early emphasis on individual system malfunctions and suspected pilot mistakes, according to people tracking developments. Instead, these people said, U.S. and Indonesian crash investigators increa...

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by SteinarN
Mon Nov 12, 2018 9:41 pm
Forum: Civil Aviation
Topic: Air Astana EMB 190 Squawked 7700 after erratic flight; landed safely
Replies: 136
Views: 33262

Re: Air Astana EMB 190 Squawked 7700 after erratic flight; landed safely

(1) Getting the wrong result from your actions completely fucks with your muscle memory. Have you tried riding a bike with reversed controls? I tried. And do you know how it functions right immediately? By crossing the arms and swapping left and right hand. I wonder whether they did that. I have tr...

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by SteinarN
Sat Nov 10, 2018 8:44 pm
Forum: Civil Aviation
Topic: FAA issues emergency 737 Max airworthiness order
Replies: 95
Views: 24201

Re: FAA issues emergency 737 Max airworthiness order

Perhaps the CoG was moved a little forward to improve drag efficiency (reduced tail loading). It is the other was around. The tail generates negative, not positive, lift. Moving the CofG forward would require more negative lift from the tail to maintain the correct angle-of-attack, and would thus i...

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by SteinarN
Sat Nov 10, 2018 8:34 am
Forum: Civil Aviation
Topic: FAA issues emergency 737 Max airworthiness order
Replies: 95
Views: 24201

Re: FAA issues emergency 737 Max airworthiness order

The AOA tells you something about how much lift the wing is generating. At zero degres AOA the wing is generating zero lift. When you have a non-symmetric (possibly supercritical) airfoil like in the case of the 737, it is not necessarily true that you have zero lift at zero degrees angle of attack...

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by SteinarN
Fri Nov 09, 2018 3:14 pm
Forum: Civil Aviation
Topic: Ryanair plane seized at Bordeaux airport
Replies: 75
Views: 15414

Re: Ryanair plane seized at Bordeaux airport,

Fantastic news! Have waited for this to happen. :stirthepot:

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by SteinarN
Fri Nov 09, 2018 9:14 am
Forum: Civil Aviation
Topic: FAA issues emergency 737 Max airworthiness order
Replies: 95
Views: 24201

Re: FAA issues emergency 737 Max airworthiness order

It should also be noted we have a max deviance of 20 degrees on the AOA data from the FDR, which means the aircraft would pitch down a maximum of 18.5 degree roughly (assuming 1.5 degrees is normal AOA) That means the rapid loss of altitude in the logs cannot be solely attributed to the auto trim a...

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by SteinarN
Fri Nov 09, 2018 6:19 am
Forum: Civil Aviation
Topic: FAA issues emergency 737 Max airworthiness order
Replies: 95
Views: 24201

Re: FAA issues emergency 737 Max airworthiness order

It should also be noted we have a max deviance of 20 degrees on the AOA data from the FDR, which means the aircraft would pitch down a maximum of 18.5 degree roughly (assuming 1.5 degrees is normal AOA) That means the rapid loss of altitude in the logs cannot be solely attributed to the auto trim a...

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by SteinarN
Thu Nov 08, 2018 8:00 pm
Forum: Civil Aviation
Topic: FAA issues emergency 737 Max airworthiness order
Replies: 95
Views: 24201

Re: FAA issues emergency 737 Max airworthiness order

I believe it is the AoA indicator that is an option. If you don't have an AoA indicator, you don't need an AoA disagree caution. Well, in this case it seems that an AoA disagree message would have been very helpful for the maintenance guys when they was trying to diagnose the airplane after the pre...

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by SteinarN
Thu Nov 08, 2018 10:15 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangal Pinang

http://services.casa.gov.au/airworth/ai ... -23-51.pdf
-->

Link to todays AD regarding this accident. Dont know if it has been posted earlier.
http://services.casa.gov.au/airworth/ai ... -23-51.pdf

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by SteinarN
Thu Nov 08, 2018 8:06 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangal Pinang

The logic of the AP disengaging due to unreliable sensor data, just for the automatic trim system to kick is, is a bit strange imho. Even more so if the trim system is not fed by at least 3 different AoA sensors. Exactly! One of two pitot systems go unreliable, systems detect this and rightfully di...

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by SteinarN
Wed Nov 07, 2018 11:10 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangal Pinang

I'm curious why the system would be allowed to cause "uncommanded horizontal stabilizer trim movement" when the data are known (or suspected) by the system to be erroneous. Would it not be safer to have the system reject the data, not cause uncommanded trim movements, and raise an alert t...

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by SteinarN
Wed Nov 07, 2018 9:55 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangal Pinang

I was very very critical regarding the performance of the AF447 pilots, but this time I wont blame the Lion Air pilots one bit with the information we have got so far. Agreed 100% Whereas AF447 was complete failure to respond to standard loss of airspeed information at high altitude (and subsequent...

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by SteinarN
Wed Nov 07, 2018 9:27 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangal Pinang

It sounds like the computer was programmed to maintain a preferred AoA, not prevent an inappropriate AoA. If that's how it works then I see your point. But if what it really was trying to do is keep the airplane from stalling then I would think it could be called some form of "protection."...

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by SteinarN
Wed Nov 07, 2018 5:48 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangal Pinang

PW100 wrote:
Was the electrical disconnecting of STS already a memory item?


I too am very interested in the answer to this question. Anyone know the answer?

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by SteinarN
Wed Nov 07, 2018 10:54 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangal Pinang

And further, what if this happens at say 500 ft just after takeoff? I certainly wouldnt be a pilot, or passenger for that matter, on that aircraft, even if I had memorized the correct action.

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by SteinarN
Wed Nov 07, 2018 10:31 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangal Pinang

If this latest development turns out to be the cause for the accident then this would be very difficult for the pilots to avoid? If so, is this the first time a modern passenger airline have flown itself into the ground leaving little room for the pilots to avoid the disaster? reported remedy: ... ...

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by SteinarN
Wed Nov 07, 2018 9:59 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 2810
Views: 514999

Re: Lion Air 737MAX8 Crashed Jakarta to Pangal Pinang

If this latest development turns out to be the cause for the accident then this would be very difficult for the pilots to avoid?
If so, is this the first time a modern passenger airline have flown itself into the ground leaving little room for the pilots to avoid the disaster?

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by SteinarN
Fri Aug 24, 2018 12:30 pm
Forum: Civil Aviation
Topic: Which Frame Will Be More Efficient....The A35J or the 779?
Replies: 299
Views: 31768

Re: Which Frame Will Be More Efficient....The A35J or the 779?

I have not seen much mentioning of the effect of wing thickness on the wing weight. Clearly a thick wing, especially thickness inboard or closer to the fuselage, will make for a lighter wing when keeping the other geometric parameters constant. Ofc, you cant add thickness as you wish as it (hugely)...

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by SteinarN
Fri Aug 24, 2018 10:10 am
Forum: Civil Aviation
Topic: Which Frame Will Be More Efficient....The A35J or the 779?
Replies: 299
Views: 31768

Re: Which Frame Will Be More Efficient....The A35J or the 779?

I have not seen much mentioning of the effect of wing thickness on the wing weight. Clearly a thick wing, especially thickness inboard or closer to the fuselage, will make for a lighter wing when keeping the other geometric parameters constant. Ofc, you cant add thickness as you wish as it (hugely) ...

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by SteinarN
Sat Aug 04, 2018 10:28 am
Forum: Civil Aviation
Topic: Hi Fly A380 operations thread 2018
Replies: 293
Views: 43349

Re: Hi Fly A380 operations thread 2018

In a way its serving as a bit of an experiment to see what an A380 can do as an LCC or ULCC. I find the concept of Premium seating without Premium service to be intriguing. Agreed. Although I think a higher density 2nd generation A380 would really be a gamechanger in that regard. Yes, this plane is...

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by SteinarN
Sat Aug 04, 2018 7:19 am
Forum: Civil Aviation
Topic: Hi Fly A380 operations thread 2018
Replies: 293
Views: 43349

Re: A Hifly Airbus 380 landed on OSL today

Ok. I did it. I went for it and booked a Premium Flex ticket departing 8/5 and returning 8/9. It priced out to $1775 r/t. a quick google search shows that is what almost everyone else is charging in economy besides Norwegian and Wow. It shows as Operated by Hi Fly on both segments. The red eye from...

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by SteinarN
Thu Aug 02, 2018 5:37 pm
Forum: Civil Aviation
Topic: Hi Fly A380 operations thread 2018
Replies: 293
Views: 43349

Re: HiFly takes delivery of first A380

As this is the only A380 flying between London and JFK, a huge OD city pair, I am sure it will be a huge success. But I admit, I hadnt believed it was Norwegian who was the customer. I wonder, if it will be a huge success, and Norwegian gets one more from HiFly, what will BA do then? Or the American...

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by SteinarN
Sun Jul 22, 2018 8:52 am
Forum: Civil Aviation
Topic: C47 Crash in Texas
Replies: 32
Views: 7418

Re: C47 Crash in Texas

Was it going at high enough speed when the main gear lifted up from ground? The tail gear was still on the ground, and it seems like it was going slowly. If you don't have wings in horizontal position (tail gear off the ground) wouldn't the angle of attack cause an early liftoff, perhaps with not e...

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by SteinarN
Sat Jul 21, 2018 7:59 pm
Forum: Civil Aviation
Topic: C47 Crash in Texas
Replies: 32
Views: 7418

Re: C47 Crash in Texas

I saw the cell phone video. This is a tail dragging plane, if that is the correct expression. That is the tail wheel is the steering wheel and the tail sits very low to the ground when on the wheels. When taking off with such a plane you need to get the tail liftet off of the runway well before you ...

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by SteinarN
Sun Jul 15, 2018 6:18 pm
Forum: Civil Aviation
Topic: JetBlue Orders 60 Airbus A220-300
Replies: 354
Views: 48714

Re: JetBlue Orders 60 Airbus A220-300

Revelation wrote:
So it sounds like DL is using A220 as hub feeder (cheap dongle) whereas B6 has it in roles that need reliable tcon range (expensive dongle).


I really like how aircrafts now have come down to which dongle version they are :)

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by SteinarN
Thu Apr 05, 2018 3:32 pm
Forum: Civil Aviation
Topic: Confirmed: HiFly adding second hand A380s
Replies: 113
Views: 30733

Re: HiFly adding second hand A380s?

The capital cost/lease for the aircraft is most likely very low all the time they dont have the cabin refurbished. If they get good utilization of the aircraft I will dare to say they can make fairly good money on it. On a side note, finally those unlucky Norwegian long haul passengers can get the e...

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by SteinarN
Fri Mar 09, 2018 12:55 am
Forum: Civil Aviation
Topic: Boeing 787 suffers nose gear collapse
Replies: 53
Views: 68106

Re: Boeing 787 suffers nose gear collapse

What is or was the plan for this aircraft? Was it going to be delivered to a customer, or was it just sitting on Boeings hand?

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by SteinarN
Tue Mar 06, 2018 5:33 pm
Forum: Civil Aviation
Topic: Airbus Is in Talks With British Airways on More A380s
Replies: 561
Views: 102358

Re: Airbus Is in Talks With British Airways on More A380s

Walsh has been talking about the A380 today, In Flightglobal: https://www.flightglobal.com/news/articles/more-a380s-of-interest-to-iag-but-prices-ridiculou-446484/ "We're not negotiating – we've said very clearly to Airbus, if they want to sell A380s they need to be aggressive on pricing."...

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by SteinarN
Thu Feb 15, 2018 7:37 am
Forum: Civil Aviation
Topic: Large Q4 and 2017 loss for Norwegian
Replies: 0
Views: 547

Large Q4 and 2017 loss for Norwegian

Norwegian today announced a loss of US$180 million for Q4, double the loss expected by the analysts. For full year 2017 the loss was US$ 138 million. Article in Norwegian only https://www.dn.no/nyheter/2018/02/15/0701/Luftfart/milliardunderskudd-for-norwegian Google translate: The Norwegian airline ...

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by SteinarN
Tue Feb 13, 2018 7:48 pm
Forum: Civil Aviation
Topic: A321 NEO LR LBG - JFK Flight Tracker
Replies: 59
Views: 11698

Re: A321 NEO LR CDG - JFK Flight Tracker

Interestingly enough, when facing head winds the optimum true airspeed for max range/lowest fuel consumption per distance does in fact increase. And the reverse when facing tail wind. Say max range cruise speed is mach 0,78 in still air. When facing severe head wind the maximum range true airspeed g...

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by SteinarN
Fri Jan 26, 2018 7:58 pm
Forum: Civil Aviation
Topic: Bombardier Wins C-Series Case at ITC
Replies: 359
Views: 42446

Re: Bombardier Wins C-Series Case at ITC

Wow! Absolutely fantastic news. My faith in fair competition based on products and performance is greatly restored when reading this.

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by SteinarN
Mon Jan 22, 2018 9:38 pm
Forum: Civil Aviation
Topic: Airbus A350 Production/Delivery Thread 2018
Replies: 1683
Views: 622698

Re: Airbus A350 Production/Delivery Thread 2018

The finnished carbon/resin composite would weight something around 1,4 kg/mm/sqmtr. So a 1,1 kg/sqmtr would be about 0,8mm thick. But you are probably correct that this is way too much for one single unidirectional layer. But a 0,1mm thick layer is only about 100 grams/sqmtr or less of carbon, that ...

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by SteinarN
Mon Jan 22, 2018 8:09 pm
Forum: Civil Aviation
Topic: Airbus A350 Production/Delivery Thread 2018
Replies: 1683
Views: 622698

Re: Airbus A350 Production/Delivery Thread 2018

Lighter wing (1 less carbon layer on both upper and bottom side of the wing) Any idea how much weight saving that constitutes? same for the new doorframing. Napkin calculation... Carbon fiber, 300 grams/sqmtr, resin for this layer is about 250 grams, so, 550 grams/sqmtr. Double this for both top an...

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by SteinarN
Mon Oct 23, 2017 8:38 pm
Forum: Civil Aviation
Topic: Boeing 777X - Updated Information And Developments
Replies: 2650
Views: 257761

Re: Boeing 777X - Updated Information And Developments

https://twitter.com/AirlineReporter/sta ... 2990679040


Hmmm, I cant see any wing spar or part of it, just production equipment. Or am I blind?
-->

KarelXWB wrote:
The first wing spar has gone into production.

Image
https://twitter.com/AirlineReporter/sta ... 2990679040


Hmmm, I cant see any wing spar or part of it, just production equipment. Or am I blind?

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by SteinarN
Fri Sep 08, 2017 11:40 am
Forum: Civil Aviation
Topic: Future of 777X
Replies: 395
Views: 41153

Re: Future of 777X

In the long run, what's worse for Boeing is that the 779's advantage is ephemeral in that it relies, to great extent, on better engines. I expect Boeing to reengine the 787 sooner than currently imagined - perhaps as early as 2025 with Ultrafan - and I expect Airbus to match that move. When that ha...

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by SteinarN
Tue Aug 22, 2017 1:18 pm
Forum: Civil Aviation
Topic: Airbus A350 Production And Delivery Thread - 2016-2017 (Part 17)
Replies: 4438
Views: 1525088

Re: A350 Production And Delivery Thread Part 17

I didnt mean Qatar in any way is/was reasonable, because I dont think they have been that. But when we are talking about what frames should actually end up not beeing delivered, objectively it is more reasonable to not deliver not yet built frames than to not deliver already built and equipped frames.

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by SteinarN
Tue Aug 22, 2017 12:15 pm
Forum: Civil Aviation
Topic: Airbus A350 Production And Delivery Thread - 2016-2017 (Part 17)
Replies: 4438
Views: 1525088

Re: A350 Production And Delivery Thread Part 17

That's why we have seen activity on MSN 63 recently. Aircraft came suddenly out of storage. And so QR doesn't need to increase its order book to re-take the 4 canceled aircraft. Just cancel 4 aircraft further down the road. Sounds reasonable. I notice MSN 161, 163 and 172 for Quatar have still not ...

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by SteinarN
Sat Jun 17, 2017 5:18 pm
Forum: Civil Aviation
Topic: Airbus is examining 'A380-Plus'
Replies: 1034
Views: 194238

Re: Airbus is examining 'A380-Plus'

Indeed, the vertical height seems to be slightly less than the fan diameter, and that is what, 1,9 mtr, or only about 5,5 ft. If we add the small winglet on the underside we reach maybe 8-9 ft. The fan diameter of the GP7000 is much bigger than 1.9m. It is 3.16m (10.4 ft; 124 in). In my view the wi...

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by SteinarN
Sat Jun 17, 2017 4:51 pm
Forum: Civil Aviation
Topic: Airbus is examining 'A380-Plus'
Replies: 1034
Views: 194238

Re: Airbus is examining 'A380-Plus'

Karel,
nope, I still get a hight slightly less than the fan diameter, even in the latest picture. And the downward pointing one is just tiny. I am disappointed. I can not belive this is the best Airbus could do. I want an at least 5mtr/15ft high skarklet!

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by SteinarN
Sat Jun 17, 2017 2:30 pm
Forum: Civil Aviation
Topic: Airbus is examining 'A380-Plus'
Replies: 1034
Views: 194238

Re: Airbus is examining 'A380-Plus'

Indeed, the vertical height seems to be slightly less than the fan diameter, and that is what, 1,9 mtr, or only about 5,5 ft. If we add the small winglet on the underside we reach maybe 8-9 ft.

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by SteinarN
Fri Jun 09, 2017 8:49 pm
Forum: Civil Aviation
Topic: Airbus is examining 'A380-Plus'
Replies: 1034
Views: 194238

Re: Airbus is examining 'A380-Plus'

Finally! I have never understood why Airbus have been so slow in implementing large winglets on the A380. This should have been done years ago. But better late than never. It is almost like I can have some faith in this combined effort, slightly better RR engines, around ten percent more passengers ...

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