Malaysia Airlines 777 missing

inigo88 said:
A fan -mounted EMU is shown
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That made a lot more sense once I saw a picture… (their site should probably really say "fan shroud-mounted" o_O)

ems2_tcm92-21044.jpg
 
My latest theory:

- copilot or pilot were 'magic the gathering' type(s), and wanted to recreate the miniseries "Lost".

- discuss
 
cezzna said:
My latest theory:

- copilot or pilot were 'magic the gathering' type(s), and wanted to recreate the miniseries "Lost".

- discuss
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Given historical hijacking, someone with intricate knowledge of the 777 hijacked this airplane, or at least knew certain systems had to be off... having pilots hijack the plane is hardly a stretch given recent events
 
Minuteman said:
That made a lot more sense once I saw a picture… (their site should probably really say "fan shroud-mounted" o_O)

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Yeah... mounting something ON the the fans would be kind of problematic.

I know in the end of flight summary file over ACARS we sent N1 and N2 vib numbers as well as peak ITT and a bunch of other stuff.

Also, when there (hypothetically) was an engine melted due to an inflight stall, the story was GE knew about it before the company did because they had alarms going off on their end that there was a plane out there with one engine that showed 3000c ITT for a second and then stopped sending any kind of data.
 
"ABC: Plane's Communications Shut Down Separately…………….Circuit breakers pulled sequentially at separate time".

Okay…Is it just me, or is there a logical explanation. Electrical Smoke/Fire. Not saying this is a cause what-so-ever, but I don't interpret transponder and ACARS CB's being pulled at separate times a smoking gun for hijacking. There are OTHER logical explanations. But thats just me.
 
A friend of mine reading this thread sent me this detailed SATCOM manual for the 777:
http://www.scribd.com/doc/136022499/Satcom-777

It says the Satellite Data Unit (SDU), Radio Frequency Unit (RFU), Beam Steering Unit (BSU) and other equipment are actually located on the E11 rack, about 1/3rd of the way back from the cockpit on the left side of the fuselage, in an overhead compartment above door 3. Due to the presence of the BSU my friend suspects they use the Inmarsat geosynchronous constellation (not Iridium). That still means that if the SATCOM sent four hours worth of pings after the airplane went missing, that rear 2/3rds of the fuselage would have had to be physically intact and connected.

Looking elsewhere, I found this article from Boeing about their airplane performance monitoring software, which tracks data transmitted by ACMS via ACARS:
http://www.boeing.com/commercial/aeromagazine/articles/qtr_03_09/article_07_1.html

Figure 4 shows a sample ACMS report, and right there bottom center is the Lat/Long. It sure would be nice if the "pings" contained this same data!

A7_fig4.gif
 
Pilot Fighter said:
The control would be to look at what the data stream and data logging looks like looks like when an aircraft crashes. At this point, I don't think the aircraft continued flying for four hours as suggested.
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EHM and ACARs via SACOM both need a/c power to transmit. That is what I'm hearing from one of our senior engineers. This whole ACARS and EHM news has been the topic of the day around the hangar.
 
When the Malaysian authorities speak, the only thing missing is the Benny Hill theme song. The plane's over here. No, it's over there. All contact was lost at 1 AM. No, the engines transmitted data for another four hours. It's in the South China Sea. No, it's in the Indian Ocean.

If over 200 people didn't lose their lives, it'd be funny.
 
tonyw said:
When the Malaysian authorities speak, the only thing missing is the Benny Hill theme song. The plane's over here. No, it's over there. All contact was lost at 1 AM. No, the engines transmitted data for another four hours. It's in the South China Sea. No, it's in the Indian Ocean.

If over 200 people didn't lose their lives, it'd be funny.
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This Asian on Asian hate has to end, @tonyw!
 
Some more clarification on the pings, this time from Reuters:
http://www.reuters.com/article/2014/03/13/malaysia-airlines-data-idUSL2N0MA18V20140313

(Reuters) - Communications satellites picked up faint electronic pulses from Malaysian Airlines Flight 370 after it went missing on Saturday, but the signals gave no indication about where the stray jet was heading nor its technical condition, a source close to the investigation said on Thursday.

The "pings" equated to an indication that the aircraft's maintenance troubleshooting systems were ready to communicate with satellites if needed, but no links were opened because Malaysia Airlines and others had not subscribed to the full troubleshooting service, the source said.
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Should have subscribed to the full service! :bang:
 
So @inigo88 I'm trying to digest all this info. WRT the SATCOM, the system had power, and the antennae was in a position to have a link to the satellite system, but no data was transmitting for 4 hrs. Any idea what powers this system (and don't say electricity)?
 
deadstick said:
So @inigo88 I'm trying to digest all this info. WRT the SATCOM, the system had power, and the antennae was in a position to have a link to the satellite system, but no data was transmitting for 4 hrs. Any idea what powers this system (and don't say electricity)?
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Batteries.

1896770_10202425283086974_231430371_n.jpg
 
deadstick said:
So @inigo88 I'm trying to digest all this info. WRT the SATCOM, the system had power, and the antennae was in a position to have a link to the satellite system, but no data was transmitting for 4 hrs. Any idea what powers this system (and don't say electricity)?
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I just looked up what you'd have on a 767-300ER if the HDG/HMU was operating. What that is, is, with both main A/C busses out, what you have left. If someone in the cockpit wanted to kill electrics to the aircraft, the easiest way to do that is switch off both A/C generators. If that happened, you'd still have some standby busses powered by the hydraulic system and the battery. I can't find a reference for the SATCOM system, but the HF would still work on standby power. One would assume SATCOM would work as well.
 
deadstick said:
So @inigo88 I'm trying to digest all this info. WRT the SATCOM, the system had power, and the antennae was in a position to have a link to the satellite system, but no data was transmitting for 4 hrs. Any idea what powers this system (and don't say electricity)?
Click to expand...

Between the WSJ article and the Reuters article, it sounds like the aircraft made automated attempts to send abnormal ACMS/ACARS reports to the airline via SATCOM over a four hour period following its disappearance from radar. The Reuters article expanded on why the WSJ article said the uplink messages only indicated the aircraft was ready to send data, because the data it wanted to send was outside the scope of what Malaysian airlines had subscribed for. I suspect that U.S. investigators may have gotten a hold of this by looking at the uplink records at Inmarsat itself, rather than relying on what Malaysian airlines received.

Edit: As far as which electrical bus the SATCOM system is on, I'm not sure. But there are definitely guys on here more qualified than I to answer. It originally sounded like whatever was supposed to send data to the SATCOM (ACMS?) was powered off, but the Reuters article makes it sound like it could have gone through, but the airline simply wasn't subscribed for that option.
 
I feel sad for the airplane flying around trying to contact somebody and never getting a response. Yes I feel bad for everyone affected, but the thought of the airplane performing as it should with no defects and doing what was asked of it and "POOF" nothing makes me sad. For some of us these machines develop personalities and identities, tell me about that 150 or J3 you soloed in and tell me I'm wrong.
 
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