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by kalvado
Thu Jan 20, 2022 11:44 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Note: Urban 5G base stations are limited to 1584 W /MHz , i. e. at a channel bandwidth of 20 MHz you'd measure a total power output of 31.7 kW right in front of the antenna. The "true" power output (how much RF power goes into the antenna) is still in the 100 W range thanks to highly dire...

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by kalvado
Thu Jan 20, 2022 6:23 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Again, it's not clear what standard FAA is applying when deciding to accept the information that substantiates that the RADALT is not susceptible to C-Band RFI. I presume they aren't setting too high a bar if they can tick the box in just a few day's time. Well at any rate it appears those stone ag...

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by kalvado
Thu Jan 20, 2022 6:21 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Similar claims have been repeated multiple times in this thread. However, when I look for confirmation of the claims, what I find instead is the FCC saying the C-Band auction was less than a year ago: https://www.fcc.gov/document/fcc-announces-winning-bidders-c-band-auction What was actually happen...

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by kalvado
Thu Jan 20, 2022 2:40 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Thales ERT-530 and -540 is now AMOC approved as well. For those wondering (like me, who just did some googling), AMOC is "Alternative Method of Compliance" and a FAA document I googled said "The proposed AMOC must include specific conditions that would address the unsafe condition (e...

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by kalvado
Thu Jan 20, 2022 8:00 am
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

So to recap. The band was auctioned off years ago. The airlines and faa new about this years ago. Then att and verizon turned their towers on after saying they were going to for months and weeks And then all the altimeters got approved within 24 hours of that? Similar claims have been repeated mult...

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by kalvado
Thu Jan 20, 2022 7:40 am
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Thales ERT-530 and -540 is now AMOC approved as well. For those wondering (like me, who just did some googling), AMOC is "Alternative Method of Compliance" and a FAA document I googled said "The proposed AMOC must include specific conditions that would address the unsafe condition (e...

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by kalvado
Wed Jan 19, 2022 9:56 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

But there are other factors. In addition to insertion loss, make up gain, and oscillation,potential RF issues within the unit, there are phase-shift, not everything is linear so you are talking testing and recertification. A steeper filter could be made by a high-schooler, but steeper filters means...

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by kalvado
Wed Jan 19, 2022 9:10 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

One of the models is most likely the Rockwell-Collins LRA-2100 , which is the default on the A350 but has been fitted to other models (A320, A330) as well. A second approved model should be the Thales ERT 550 https://www.thalesgroup.com/en/communication-and-navigation-commercial-aircraft , which is...

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by kalvado
Wed Jan 19, 2022 9:08 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

So far, 777 and 787 seem to be confirmed as affected. So much for modern. Airplane models with one of the five cleared altimeters include some Boeing 717, 737, 747, 757, 767, 777 , MD-10/-11 and Airbus A300, A310, A319, A320, A330, A340, A350 and A380 models. So half of your fanboy estimate just fl...

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by kalvado
Wed Jan 19, 2022 7:46 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

just in case - let me show you the scope of work from my semi-educated RF understanding. This is a commercially available filter for similar frequency range. Not exactly what altimeters need, but a good idea of how things look: https://www.pasternack.com/8-section-band-pass-filter-7.9-8.4-ghz-passb...

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by kalvado
Wed Jan 19, 2022 6:55 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

787 - a totally new plane - was supposed to go from start to finish in 5 years. it took 8 or so. 737MAX full computer system was fully redesigned in somewhat over a year. So 4-6 years for a single filter? No. Still 4 years? Fire everyone on property and hire some professionals. Have you been involv...

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by kalvado
Wed Jan 19, 2022 6:22 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

The MAX was one system, well understood, not remotely similar to changing an installed fleet of, perhaps 20,000 frames. Every type built in the last 25 years is affected. The 787 was well into design when the formal announcement was made and Boeing has years of carbon fiber experience in the B-2 pr...

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by kalvado
Wed Jan 19, 2022 6:16 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Perhaps you missed GalaxyFlyer’s earlier post that certifying new equipment was a minimum 4-6 year affair. May I disbelieve that? 787 - a totally new plane - was supposed to go from start to finish in 5 years. it took 8 or so. 737MAX full computer system was fully redesigned in somewhat over a year...

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by kalvado
Wed Jan 19, 2022 6:10 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

RJs either wait their turn for review or are all problematic. Many RJs aren't equipped for low-visibility (ILS CAT II / III), or their pilots aren't certified / trained to use it. It's a relatively small issue, operationally, to cancel or delay short haul flights for weather, while maintaining the ...

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by kalvado
Wed Jan 19, 2022 5:18 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

The expedient thing for the FAA to do was nothing, which is pretty much what they did. No way did they have the resources to clear up their side of the problem within the time frame the telecomms planned for 5G C-band rollout. Certifying new equipment and procedures was going to take way longer tha...

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by kalvado
Wed Jan 19, 2022 5:11 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

The FCC sold the licenses, and the FAA failed to act expediently on an issue that has certified parts operating outside the licensed and advertised range. The expedient thing for the FAA to do was nothing, which is pretty much what they did. No way did they have the resources to clear up their side...

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by kalvado
Wed Jan 19, 2022 5:09 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

FCC certification requirement was, for ages, that device should not cause interference to others, but should be able to tolerate interference from other devices. Again, technically speaking, any transmission from the aircraft is FCC licensed. It is mostly formal thing, but yet. Looks like altimeter...

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by kalvado
Wed Jan 19, 2022 5:01 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Of course, it may be a temporary fix. But one thing at a time. Reminds me of a saying: there's nothing as permanent as a temporary tax! Anyway, I am sure US skygods should be able to land with such a minor malfunction as a single non-functional piece of instrumentation. One data source would be mal...

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by kalvado
Wed Jan 19, 2022 4:51 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

You should research the cause of many airplane crashes before making such a ridiculous statement. Most of the time they can, but that could be very catastrophic. This is in direct relation to "third world pilots" being thrown around after MAX fiasco. Looks like once an issue hits closer t...

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by kalvado
Wed Jan 19, 2022 4:39 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Then, in 20 years from now a bunch of Internet know-it-alls will be writing about that one year rush job not taking into account the last twenty years of advancement in wireless technology. Anyway, I am sure US skygods should be able to land with such a minor malfunction as a single non-functional ...

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by kalvado
Wed Jan 19, 2022 4:21 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Or... the transmitter that is part of the telecomms' new 5G does not adequately control it's signals. Take your pick. I think this is not the case, the 5G transmitter is transmitting in licensed bands at licensed power levels. And radio altimeters don't? Are they rogue broadcasters? What everyone s...

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by kalvado
Wed Jan 19, 2022 3:26 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

From Rev.. "You get the government you elect. One set of political beliefs portray government as nothing but an obstruction, yet this case shows where we'd all be a lot better off if the government had enough power to steer events. Given they don't, we end up with open corporate warfare and th...

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by kalvado
Wed Jan 19, 2022 3:10 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

On a serious note, though, scope if work is much smaller. They need add-on filters for existing units, and those can be small ones, size of a matchbox or so. And if telecom industry can be brought on board, it will be about qualified people who are doing RF for a living, not Boeing or Honeywell, wo...

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by kalvado
Wed Jan 19, 2022 1:20 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

There is a clear explanation of the issues in Leeham today: "Despite year-long protests from the World’s airlines and the FAA, the FCC (Federal Communications Commission) allows Verizon and ATT to roll out 5G base stations underneath the approach paths of landing aircraft in the US. In 2020 th...

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by kalvado
Wed Jan 19, 2022 1:00 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

There is a clear explanation of the issues in Leeham today: "Despite year-long protests from the World’s airlines and the FAA, the FCC (Federal Communications Commission) allows Verizon and ATT to roll out 5G base stations underneath the approach paths of landing aircraft in the US. In 2020 th...

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by kalvado
Wed Jan 19, 2022 11:46 am
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

The FAA asked them to stop the process pending more investigation more than a year ago and they were involved with a task force that sent a study to to the FCC back in 2020 demonstrating aviation impacts, the FCC went ahead with the December 2020 auction. DOD also sounded the alarm well before now....

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by kalvado
Wed Jan 19, 2022 2:21 am
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Typical US Government one agency not talking to the other FCC auctioned off those bands a while ago and made billions, FAA never said a thing to them back then. my two cents Andrew The FAA asked them to stop the process pending more investigation more than a year ago and they were involved with a t...

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by kalvado
Wed Jan 19, 2022 12:35 am
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Curious as to what specific brand of radio altimeters are affected Looks like https://aerospace.honeywell.com/us/en/learn/products/navigation-and-radios/ala-52b-radar-altimeter is affected as it is listed for 777 and those seem problematic. I couldn't find if another one is authorized for 777 But t...

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by kalvado
Tue Jan 18, 2022 9:49 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

CBand for the Wireless companies is 3.7GHz to ~4Ghz The radar altimeters on the planes are at 4.2 to 4.4 Ghz. Don't these altimeters understand when the frequency coming back to them is not the one they are sending out? Or is the Risk, that they can't control the frequency between the plane and the...

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by kalvado
Tue Jan 18, 2022 9:47 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Typical US Government one agency not talking to the other FCC auctioned off those bands a while ago and made billions, FAA never said a thing to them back then. my two cents Andrew FAA and industry explicitly refused cooperating in evaluation of the problem citing proprietary nature of data and equ...

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by kalvado
Tue Jan 18, 2022 9:10 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Curious as to what specific brand of radio altimeters are affected Looks like https://aerospace.honeywell.com/us/en/learn/products/navigation-and-radios/ala-52b-radar-altimeter is affected as it is listed for 777 and those seem problematic. I couldn't find if another one is authorized for 777 But t...

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by kalvado
Tue Jan 18, 2022 8:23 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

So far, 777 and 787 seem to be confirmed as affected. So much for modern. The airplane models approved include some Boeing 737, 747, 757, 767, MD-10/-11 and Airbus A310, A319, A320, A321, A330 and A350 models. I don't see B777, B787, A220, A340, A380. Any thoughts? I wouldn't call A220, A340, and A...

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by kalvado
Tue Jan 18, 2022 8:20 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Curious as to what specific brand of radio altimeters are affected Looks like https://aerospace.honeywell.com/us/en/learn/products/navigation-and-radios/ala-52b-radar-altimeter is affected as it is listed for 777 and those seem problematic. I couldn't find if another one is authorized for 777 But t...

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by kalvado
Tue Jan 18, 2022 7:37 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

I've heard otherwise which would make it helpful to know some specifics. My assumption is the broadcast by the towers can "cross over" to the specific frequency of the radio altimeters. The airplane and the 5G tower are transmitting on licensed frequencies with licensed power levels. The ...

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Seems like whatever is done on FAA side, was done over past 2 weeks.
-->

32andBelow wrote:
readytotaxi wrote:
AT&T have agreed to delay launch for two weeks.

https://www.theguardian.com/business/20 ... ty-warning

What’s gonna change in 2 weeks?

Seems like whatever is done on FAA side, was done over past 2 weeks.

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by kalvado
Tue Jan 18, 2022 5:43 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

The idea of the phone companies "dropping," the frequency is a non-starter. They collectively paid over $80,000,000,000 for that spectrum plus the costs to upgrade their infrastructure to use that spectrum and market the benefits. The U.S. Govt also has little stomach to simply ban someth...

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by kalvado
Tue Jan 18, 2022 4:40 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

It seems to me that the Airlines are trying to rile up the traveling public with all this "the sky is falling" rhetoric. I can see Social Media awash with (insert Phone Company name) " made me miss my flight" Made (insert Airline Name here) cancel my flight to (insert Airport He...

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by kalvado
Tue Jan 18, 2022 9:13 am
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Update from FAA on some planes that are cleared. FAA clears 45% of U.S. commercial fleet for low-visibility landings at many airports Today, the FAA cleared an estimated 45 percent of the U.S. commercial fleet to perform low-visibility landings at many of the airports where 5G C-band will be deploy...

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by kalvado
Tue Jan 18, 2022 3:58 am
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: Airline CEO’s Warn Of “Catastrophic” Travel Chaos Due To 5G Rollout Wednesday. May Permanently Ground some types

This Reuters article goes into more detail: "Airplane manufacturers have informed us that there are huge swaths of the operating fleet that may need to be indefinitely grounded." One area of concern is whether some Boeing 777s will be unable to land at some key U.S. airports after 5G serv...

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by kalvado
Tue Jan 18, 2022 2:45 am
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

I'm a little surprised that the companies that make the radar altimeters aren't looking for a solution that doesn't require replacing the boxes .... maybe they are. As an engineer, my first thought would be a narrow bandpass filter to reject the 5G frequencies inserted in the coax antenna lead from...

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by kalvado
Tue Jan 18, 2022 1:34 am
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: Airline CEO’s Warn Of “Catastrophic” Travel Chaos Due To 5G Rollout Wednesday. May Permanently Ground some types

This Reuters article goes into more detail: "Airplane manufacturers have informed us that there are huge swaths of the operating fleet that may need to be indefinitely grounded." One area of concern is whether some Boeing 777s will be unable to land at some key U.S. airports after 5G serv...

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by kalvado
Sun Jan 16, 2022 8:06 pm
Forum: Civil Aviation
Topic: CNN reporting all flights from the United States to China have either been canceled or suspended
Replies: 52
Views: 9696

Re: CNN reporting all flights from the United States to China have either been canceled or suspended

I don’t answer to you, but I’ll say that unless you’re an epidemiologist or virologist, as good if not better than yours. Yes but I know my opinion is not perfect unlike people like you That doesnt even make sense. Were offering opinions and I use data to show why I believe what I do. Never did I s...

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by kalvado
Sun Jan 16, 2022 4:25 pm
Forum: Civil Aviation
Topic: CNN reporting all flights from the United States to China have either been canceled or suspended
Replies: 52
Views: 9696

Re: CNN reporting all flights from the United States to China have either been canceled or suspended

The idiocy of a zero Covid policy knows no bounds. With such full hospitals and having to call around to find anything for my 80 year old mom with covid19 right now, it actually doesn't seem like that bad a policy. The USA now has over 150,000 with coronavirus in the hospital vs. a prior peak of 13...

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by kalvado
Sat Jan 15, 2022 8:41 pm
Forum: Civil Aviation
Topic: Delta security officer 'viciously assaulted,' repeatedly beaten with his own radio at JFK
Replies: 22
Views: 4963

Re: Delta security officer 'viciously assaulted,' repeatedly beaten with his own radio at JFK

There is no system for dealing with assault and mayhem in aviation. Congress or State legislatures passing laws is vaperware until courts, law enforcement people, and jails are defined, funded, and hired. Jurisdictions also need to be defined and established. I suspect that this is done if murder i...

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by kalvado
Sat Jan 15, 2022 8:07 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Now performance impacts on the B787. https://www.reuters.com/technology/faa-requires-new-precautions-some-boeing-787-landings-after-new-5g-launches-2022-01-14/ From faa.gov: Continued Airworthiness Notification to the International Community - Boeing 787 Altimeter and 5G CAN-2022-01.pdf This messag...

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by kalvado
Sat Jan 15, 2022 8:01 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Revelation wrote:
kalvado wrote:
That "fault tolerance" must be an alien concept for some design organizations...

Don't set the bar too high, the current staff just got schooled on electrical grounding and is now working through shimming.

Tripping hazards should be avoided throughout the facility

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by kalvado
Sat Jan 15, 2022 6:17 pm
Forum: Civil Aviation
Topic: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference
Replies: 432
Views: 54534

Re: FAA to prohibit many flight operations due to risk of ‘5G’ wireless interference

Now performance impacts on the B787. https://www.reuters.com/technology/faa-requires-new-precautions-some-boeing-787-landings-after-new-5g-launches-2022-01-14/ From faa.gov: Continued Airworthiness Notification to the International Community - Boeing 787 Altimeter and 5G CAN-2022-01.pdf This messag...

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by kalvado
Sun Jan 09, 2022 10:10 pm
Forum: Technical/Operations
Topic: DC-10 tail mounted engine angle
Replies: 9
Views: 1912

Re: DC-10 tail mounted engine angle

From the backside of the envelope estimate, it makes sense for the engine to be tilted and have some vertical component to the thrust. This pays back as lift requirement is reduced, and so is drag. It's a relatively small effect - less than 5% - so working at low angles only, 2-3 degrees seem to be ...

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by kalvado
Sun Jan 09, 2022 7:01 pm
Forum: Civil Aviation
Topic: Emirates serious incident on takeoff on EK231 DXB-IAD on 20 December 2021
Replies: 267
Views: 63052

Re: Emirates serious incident on takeoff on EK231 DXB-IAD on 20 December 2021

One would hope that on the next iteration of airplanes that they might design in some features to make this harder to do even if no was meant to, as it did happen. Engineeringing today is a race between s engineers striving to build bigger and better idiot-proof designs, and the Universe trying to ...

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by kalvado
Sun Jan 09, 2022 6:48 pm
Forum: Technical/Operations
Topic: Hours on Type/Total Flying Hours Question
Replies: 32
Views: 1758

Re: Hours on Type/Total Flying Hours Question

A bit different aspect of it, I assume what original question implied: How important is the experience on the type vs general experience? How transferrable skills are? E.g. how much 10k+ hours on 737 matter for the upgrade to, say, A350 captain - aircraft being pretty dissimilar to 737. Does overal...

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