Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 4 / 4
Navelpluis
User Rank
CEO
Communications in HF bands
Navelpluis   3/18/2014 12:07:15 PM
NO RATINGS
I know from a friend that sometimes pilots communicate with HAM radio frequencies. Just to kill the time, just for pure fun. It happens -for example- when they flies to Africa. Over long stretches there is no other communication than Satcom or RF radio, that's it. So for the Malaysian 777 you can think of the same scenario: Only Satcom and a beacon frequency, detected and responded by radar. The latter has been switched off.... Scary.... !!

elctrnx_lyf
User Rank
Manager
Re: We didn't use to design with wrongdoing in mind
elctrnx_lyf   3/18/2014 11:53:35 AM
NO RATINGS
82 planes in 65 years frightens me. Is this real?

BillWM
User Rank
Freelancer
Re: We didn't use to design with wrongdoing in mind
BillWM   3/18/2014 9:21:40 AM
NO RATINGS
ACARs was upgraded from something like 2400/4800 baud to 33K-baud in the late 1990's -- to about 2005 -- it only works within about 120-180mi of the land based ground station - after this depending on what the airline has paid for and what unit's are powered on in the aircraft the data is re-routed via SATCOM -- as this airliner normally only flew shorter distances over water, and the airline was under-water financially it might not be that un-common for the SATCOM routing to be turned off in the aircraft configureation.  As more than one ACARS transciever is normally carried, and the data stopped all at once it might be the case they were switched off.

Sheetal.Pandey
User Rank
Manager
Re: We didn't use to design with wrongdoing in mind
Sheetal.Pandey   3/18/2014 6:57:24 AM
NO RATINGS
There was a discussion going on this subject on the news channels yesterday eveing and one of the panelist told that no one will ever come to know about what happened to this airline. He was saying since 1948 there are 82 planes that went missing and there is no data found on what happened to them and this is going to be the same case.

Sanjib.A
User Rank
CEO
Re: We didn't use to design with wrongdoing in mind
Sanjib.A   3/17/2014 11:50:13 PM
NO RATINGS

@Max: As I have learned from the recent discussions, ACARS (Aircraft Communications Addressing and Reporting System) does the same kind of communication that you have mentioned. But I am not sure, when that system was last modernized. I understand in the aviation industry technology progresses at a slower pace as the "proven-in-use" technologies are adopted and newer stuffs goes through a lots of certification process to analysis unless the failure-modes are well defined and proper preventive & protective measures are taken. But this kinds of incidents drive us to re-think: could we improve anything?

Bert22306
User Rank
CEO
Re: We didn't use to design with wrongdoing in mind
Bert22306   3/17/2014 10:48:10 PM
NO RATINGS
I'm actually not so surprised, in cases where the plane is flying over an ocean. The only long range link that works in cases like that would be satcom, but there's no guarantee that the entire oceans are continuously covered. Over land, and even on crossings between North America and Europe, airliners should almost always be within range of some ground control. But the southern hemisphere has gymongous expanses of ocean.

BillWM
User Rank
Freelancer
Re: Most planes put in service after 911 have a few more systems
BillWM   3/17/2014 7:40:05 PM
NO RATINGS
A very real risk in any piece of Avionics is short-circuit / fire -- the only real way to address it is to have a breaker the pilot can pull to remove the unit from energy --

 

Most of the passenger wi-fi systems only work over land - they piggy back on the larger demand for terestrial wi-fi / internet in remote area's where running fiber/copper is too costly

rick merritt
User Rank
Blogger
Re: Most planes put in service after 911 have a few more systems
rick merritt   3/17/2014 7:31:23 PM
NO RATINGS
I'm amazed there is nothing in the black box recorder or elsewhere that CAN'T be turned off for just such situations.

Modern planes have data links for passenger Wi-Fi. Anyway that can be leveraged?

BillWM
User Rank
Freelancer
Most planes put in service after 911 have a few more systems
BillWM   3/17/2014 2:26:36 PM
NO RATINGS
Most of the planes put in service after 9-11 have a few more systems that provide more data at a higher data-rate -- this system was put in service in the early 1990's and if I could remind everyone in that era GSM with 9600 baud data was the norm for cellular even - a big issue is that airlines around the world are strapped by high fuel costs, and unless the system that provides tracking can also be leveraged to reduce this expense in daily operation, there is no ROI to allow for upgrades.

Max The Magnificent
User Rank
Blogger
We didn't use to design with wrongdoing in mind
Max The Magnificent   3/17/2014 2:18:03 PM
NO RATINGS
I must admit that I find it hard to believe that, with all of the technology available to us today, we can completely lose track of a 777 airliner for goodness sake!

I think one problem is that a lot of the systems we engineers designed originally were not created with the thought of malfeasance in mind. Having said that, since the 9/11 infamy, I would have thought it would be mandatory to equip aircraft with something that kept on transmitting its GPS coordinates every minute or so and that could not be disabled from within the plane itself.

 

<<   <   Page 4 / 4


Flash Poll
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

MSGEQ7-Based DIY Audio Spectrum Analyzer: Testing
Max Maxfield
11 comments
In my previous column on this topic, we discussed the step-by-step construction of the first pass at a MSGEQ7-based DIY audio spectrum analyzer for use in my BADASS Display project. Of ...

Karen Field

June 2014 Cartoon Caption Winner
Karen Field
13 comments
Congratulations to "Wnderer" for submitting the winning caption for our June cartoon, after much heated conversation by our judges, given the plethora of great entries.

Jeremy Cook

Inspection Rejection: Why More Is Less in a Vision System
Jeremy Cook
3 comments
Albert Einstein has been quoted as saying, "Everything should be as simple as possible, but not simpler." I would never claim to have his level of insight -- or such an awesome head of ...

Jeremy Cook

Machine Fixes That Made Me Go 'DUH!'
Jeremy Cook
21 comments
As you can see in my bio at the end of this article, I work as a manufacturing engineer. One of my favorite things that happens on a Friday late in the afternoon is to hear my phone ring ...

Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)