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  • Bmused55
    Aaahh Emu!
    • Oct 2003
    • 11136

    As is the usual case. Such expense (even minor expense) will be shrugged off until the authorities mandate such equipment.
    Bmused55

    Keep thy airspeed up, less the earth come from below and smite thee.

    My Blog
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    • skyskooter
      Rank 5 Registered User
      • Oct 2012
      • 414

      Originally posted by skyskooter View Post
      Does anyone know the depth of water in the presumed loss location. If the flight data recorder is lying at that depth and is still in working order what would be the range of its locator beacon.
      Answering my own question but apparently the approximate depth of water in the vicinity of the objects spotted in satellite images is 10,000 feet and the locator beacon range is about 15 miles. Here's hoping a surface vessel can find the needle in the haystack.

      Comment

      • TomcatViP
        Rank 5 Registered User
        • Nov 2011
        • 6122

        I have no doubt to think that if there was a fire in the frwd section, the fuselage integrity was breached pretty fast.

        Reading MH667 final report it's easy to understand that the hole in the fuselage appeared quite quickly.

        Comment

        • 27vet
          Rank 5 Registered User
          • Nov 2009
          • 2700

          Originally posted by skyskooter View Post
          Answering my own question but apparently the approximate depth of water in the vicinity of the objects spotted in satellite images is 10,000 feet and the locator beacon range is about 15 miles. Here's hoping a surface vessel can find the needle in the haystack.
          Don't be confused between the ELT(Emergency locator transmitter) and the underwater acoustic beacon which is attached to the FDR and CVR. I don't believe the ELT will work underwater. The acoustic "pinger" is the gadget on the outside of the right hand side of the FDR. It has a 2 or 3 mile range.

          sigpicHindsight is what you see from the tailgunner's position...

          Comment

          • hawkdriver05
            Rank 5 Registered User
            • Mar 2005
            • 1372

            Has any debris actually been found yet?

            Comment

            • 27vet
              Rank 5 Registered User
              • Nov 2009
              • 2700

              Nothing at all.
              sigpicHindsight is what you see from the tailgunner's position...

              Comment

              • Deano
                Moderator
                • Aug 2003
                • 3098

                Gents can we please observe COC Rule 14 and not directly quote the post above unless breaking it down. As a standard please just click Reply and not Reply with Quote. Thanks

                Originally posted by Matt-100 View Post
                Am I right in saying due to rostering, crews only find out who they'll be flying with days before they fly (or even on the day that they fly) - perhaps Deano can give an insight? But if this is the case then you're telling me all the crew were convinced to go along with a hijacking plot within the space of 5-48 hours without a single one reporting anything to the police?
                Matt I only just saw this but it depends on the airline and what system they use. We use a system called AIMS, which is a worldwide system and you can see who you are flying with within a roster period. The only caveat to that is that this system to see who you're flying with in the "future" can be disabled.

                Originally posted by Kiwiguy View Post
                Similar with transponders that except for the new style push button transponders it is normal practice after handing off from one airspace and before getting a new transponder code to switch to standby until a new code is inputted.
                Not the case with all modern transponders. There's usually a standby display that you can input the new squawk code into then you simply move it up to the active position.

                Originally posted by J Boyle View Post
                I've seen on PPrune...and other discussions of the crash by non-aviation people...people asking if the plane could have hit the water and been swallowed whole, leaving no debris.
                For those of you too young to remember, here's video of a RAF Nimrod hitting Lake Ontario in 1995. Don't view it if you're sensitive.
                http://www.youtube.com/watch?v=CAcHCpaZpSk
                So the short answer is...no, not even a strong modern jetliner can't withstand an impact like that.
                I don't think anyone can say for certain about the crash mapping of a B777 because it is mainly composite material. Nobody knows how it wold break up in a ditching or high speed entry into water.

                Originally posted by Bmused55 View Post
                Dropping the pressure is only a possible technique on freighters. It is not a valid technique when you have passengers and I doubt you'll find it in an airlines fire check list. First and foremost because you'll kill the passengers. I find it hard to believe a captain with 33 years experience would resort to such action.
                Sandy

                With respect that is not true. Depressurising the aircraft is a valid way of removing smoke even in passenger aircraft. Here is a picture of our Fuselage Fire QRH Drill:

                Last edited by Deano; 21st March 2014, 23:05.
                http://www.findmadeleine.com

                Comment

                • Bmused55
                  Aaahh Emu!
                  • Oct 2003
                  • 11136

                  Sorry Deano, I should have been more precise. I meant: Depressurising at altitude. At FL100 or below, fair enough. As states in your checklist.
                  Above that, you will potentially do more harm than good.

                  In my mind, I was parsing the conversation here and those on other forums were people were suggesting the apparent climb to FL450 was an attempt to snuff out a fire.
                  My head put that and the suggestion above of depressurisation together. I answered imprecisely. My bad.
                  Bmused55

                  Keep thy airspeed up, less the earth come from below and smite thee.

                  My Blog
                  My Designs

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                  • Deano
                    Moderator
                    • Aug 2003
                    • 3098

                    Sandy

                    Have a look at the checklist again, it dictates we depressurise then descend to below 10,000ft. Descending is secondary. Flight compartment fire dictates we wind the cabin alt forward outflow valve to fully open.
                    http://www.findmadeleine.com

                    Comment

                    • Bmused55
                      Aaahh Emu!
                      • Oct 2003
                      • 11136

                      You learn something new everyday!
                      Bmused55

                      Keep thy airspeed up, less the earth come from below and smite thee.

                      My Blog
                      My Designs

                      Comment

                      • Mondariz
                        Rank 5 Registered User
                        • Aug 2007
                        • 1579

                        Anyone care to guess why the cabin crew didn't activate one of the manual ELTs in the cabin?

                        While the portable ELTs aren't normally used in such situations, I think it could indicate that the cabin crew either didn't fully understand their situation, or that they were incapacitated. Since it was a 7 hour flight the latter seems more likely. If awake and aware they would have been going through any possible action/scenario.

                        Note: after Air France 447 is was recommended: ...making mandatory the activation of the Emergency Locator Transmitter (ELT) when an emergency situation is detected on board.

                        While this recommendation hasn't yet been followed by legislation, the idea of using an ELT for signaling inflight distress is certainly known in aviation circles. I think this adds further weight to the idea that cabin crew was incapacitated.

                        Comment

                        • slipperysam
                          mmmm.... donuts
                          • May 2006
                          • 784

                          http://www.abc.net.au/news/2014-03-2...llites/5339092

                          Malaysia Airlines MH370: Chinese satellites spot new possible debris from missing plane

                          By China correspondent Stephen McDonell in Kuala Lumpur, wires

                          Updated 18 minutes ago

                          Chinese satellite images of possible Malaysia Airlines debris Photo: The new satellite image shows a large floating object in the Indian Ocean that could be related to Malaysia Airlines flight MH370. (AFP/CCTV )


                          Related Story: Search for Malaysian flight MH370 to continue into 'foreseeable future'


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                          Chinese satellite images have detected a large object in the ocean that could be part of missing Malaysia Airlines flight MH370, Malaysian authorities have said.

                          Malaysia's transport minister Hishammuddin Hussein said objects were spotted floating in the southern search area in the Indian Ocean.

                          "Chinese ships have been dispatched to the area. Beijing is expected to make an announcement in a few hours," Mr Hussein told reporters at a briefing in Kuala Lumpur.




                          In a later press statement, Malaysia's transport ministry clarified that there was one "suspected" object with an estimated size of 22.5 metres by 13 metres.

                          Attached coordinates suggested it was in roughly the same area of remote ocean as two possible objects spotted on satellite images taken on March 16 and released by the Australian Government on Thursday.

                          Chinese state television later released a copy of the undated, grainy satellite image.

                          China's Xinhua news agency said the object was spotted 120 kilometres from those spotted by Australia.

                          Australian and US spotter planes have been scouring the area for the past three days, but without finding any sign of the suspected wreckage.

                          Search to continue 'indefinitely': Acting PM Truss

                          The development comes after Acting Prime Minister Warren Truss said the Australian-led search in seas off Western Australia's coast would continue "indefinitely".

                          The Australian Maritime Safety Authority (AMSA) is coordinating the hunt in the vast southern search corridor for the jet that went missing two weeks ago with 239 passengers on board.

                          Searching on Friday focused on a 36,000 square kilometre area of wild and remote sea almost 2,500 kilometres south-west of Perth.

                          Three RAAF P3 Orion aircraft, a New Zealand P3 Orion and two long-range commercial jets were involved in the search.

                          Two of the five planes have returned empty-handed. The last of the planes is expected to return to Perth about midnight local time (3:00am AEDT).

                          The search will resume at first light, with extra planes and boats expected to join in.

                          Earlier, AMSA said two merchant ships were in the area together with the Australian naval vessel HMAS Success, which is capable of picking up any wreckage.

                          A total of six merchant ships have participated in the search since a shipping broadcast was issued by the AMSA on Monday evening.
                          We are 100% SNAFU

                          Comment

                          • 19kilo10
                            Rank 5 Registered User
                            • Sep 2010
                            • 770

                            Still nothing?

                            Comment

                            • J Boyle
                              With malice towards none
                              • Oct 2004
                              • 9806

                              Originally posted by Deano View Post
                              I don't think anyone can say for certain about the crash mapping of a B777 because it is mainly composite material. Nobody knows how it wold break up in a ditching or high speed entry into water.
                              Sandy

                              I didn't know the 777 fuselage was composite.
                              Still, I bet the authorities and or Boeing know how it would react. I'd have to imagine some sort of computer modeling was done at some point in the 777s development.

                              Also, we haven't heard much of the Chinese dissident theory since China said it checked out all its people on the flight.
                              At the risk of sounding like a conspiracy nut, I'm really not sure China would readily admit to a large or well-organized group that could carry out an "event" like this.
                              Last edited by J Boyle; 22nd March 2014, 19:22.
                              There are two sides to every story. The truth is usually somewhere between the two.

                              Comment

                              • TomcatViP
                                Rank 5 Registered User
                                • Nov 2011
                                • 6122

                                Originally posted by Deano View Post
                                Sandy

                                Have a look at the checklist again, it dictates we depressurise then descend to below 10,000ft. Descending is secondary. Flight compartment fire dictates we wind the cabin alt forward outflow valve to fully open.
                                Depressurization is not instantaneous (nobody wants that). Giving time before the descent to the vent system to cope with extracting the air might help in clearing the fumes (pressure differential). Then FL100 for safety.

                                Initiating the descent before the fumes are fully cleared is how I understand the recommendations on your checklist

                                Comment

                                • Bmused55
                                  Aaahh Emu!
                                  • Oct 2003
                                  • 11136

                                  Originally posted by Deano View Post
                                  [color=red]
                                  I don't think anyone can say for certain about the crash mapping of a B777 because it is mainly composite material. Nobody knows how it would break up in a ditching or high speed entry into water.
                                  And here I can teach you something

                                  The 777 fuselage is an aluminium alloy. It has composite components, such as the radome, wing to body fairing, etc. The tail is also composite I'm told. However, the fuselage is mainly metal. We know how it will react in an accident. The BA and Asiana 777 crashes have shown the fuselage to be quite resilient to punishment.

                                  Perhaps you mixed it up with the 787? That does have an all composite fuselage.
                                  Last edited by Bmused55; 22nd March 2014, 20:30.
                                  Bmused55

                                  Keep thy airspeed up, less the earth come from below and smite thee.

                                  My Blog
                                  My Designs

                                  Comment

                                  • Deano
                                    Moderator
                                    • Aug 2003
                                    • 3098

                                    Originally posted by TomcatViP View Post
                                    Depressurization is not instantaneous (nobody wants that). Giving time before the descent to the vent system to cope with extracting the air might help in clearing the fumes (pressure differential). Then FL100 for safety.

                                    Initiating the descent before the fumes are fully cleared is how I understand the recommendations on your checklist
                                    If you look at the checklist again for a flight compartment fire and cabin fire, the first one tells you to open the forward outflow valve. Whilst not akin to a rapid decompression it will depressurise the aircraft within 30 seconds. In the second part in the cabin fire checklist, switching the controller to dump will have exactly the same effect.

                                    Initiating the descent is not what the checklist tells you or what it means. However any flight crew worth their salt would have already called a mayday by this point and would be diverting and descending, but it most certainly is not a pre-requisite of the checklist.


                                    Sandy

                                    You're right. I'm talking about the internal structure of the floor beams, pax cabin and the tail plane. The skin is the aluminum alloy you talk about so I'm led to believe. I think the main structure of the aircraft is composite and this is what gives it it's strength that you allude to in the said crashes.
                                    http://www.findmadeleine.com

                                    Comment

                                    • TomcatViP
                                      Rank 5 Registered User
                                      • Nov 2011
                                      • 6122

                                      rgrt didn't expect that could be so fast given the internal volume of the jet.

                                      Boeing 777 fuselage section :

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                                      Click image for larger version

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                                      Source:
                                      http://airchive.com/


                                      Regarding the frwd fuselage tank I was mentioning, I fear I mistook the shaded shape on the sketch for what it is not (see fire doc some page ago). Does someone have any clues about it ?
                                      Last edited by TomcatViP; 23rd March 2014, 05:39.

                                      Comment

                                      • Newforest
                                        Rank 5 Registered User
                                        • Apr 2005
                                        • 8892

                                        France has now apparently found images of possible debris which they have forwarded to Oz. Presumably France has some satellites floating around?

                                        http://www.aol.com/article/2014/03/2...26pLid%3D45684
                                        http://www.flightmemory.com/ I have been round the world 11.83 times!

                                        Comment

                                        • 27vet
                                          Rank 5 Registered User
                                          • Nov 2009
                                          • 2700

                                          There are several thousand satellites orbiting the earth, the French one has probably been tracking Sarkosy

                                          About 6,600 satellites have been launched. The latest estimates are that 3,600 remain in orbit.[1] Of those, about 1,000 are operational;[2][3] the rest have lived out their useful lives and are part of the space debris. Approximately 500 operational satellites are in low-Earth orbit, 50 are in medium-Earth orbit (at 20,000 km), the rest are in geostationary orbit (at 36,000 km).[4]
                                          [Wikipedia - Satellite]
                                          sigpicHindsight is what you see from the tailgunner's position...

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