Cargo 737 presumed down - Arabian Sea near Pakistan

“ …it reported a navigation system problem…”

“Aviation expert Imran Aslam told local ARY News that it remains unclear what caused the aircraft to disappear from radar. He said that even if an aircraft suffers an engine failure, it would normally continue gliding rather than plunge suddenly. “I still cannot understand how the plane went down so abruptly instead of gliding,” he said.”
 
What kind of “expert” cannot understand the 1001 reasons it would plunge? Next…

So with this little info, nav problems bespeak electrical. Plunge could indicate fire. Those two are related.
 
Dana said:
In that part of the world, a missile would be a likely cause... especially if a "navigation problem" caused it to be where it shouldn't.
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Appears to be heading straight down the center of the gulf on a straight line to its destination. That seems to be a standard routing as there were other planes on the same track. Of course, it is in a war zone and planes have been shot down before, but this one seems to have held together enough to get radar hits on the resulting descent.
 
“began flying as a passenger aircraft, originally with Aeroflot”

They never got all the Russian out of it.
 
Dana said:
In that part of the world, a missile would be a likely cause... especially if a "navigation problem" caused it to be where it shouldn't.
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Could be, but they were well east of the Straight and away from the Iranian boarder. They were flying south of Pakistan at the time.

Sounds like the navigation problem was GPS jamming. I don't know how the 737-400 was equipped. The NGs, and later, have duel IRUs which VHF and GPS updating so loss of GPS only reducing your ANP (position accuracy), you don't lose the ability to navigate via RNAV.
 
Wreckage has been located; descent rate of 22K FPM, sounds like a broken airplane.
 
Larry in TN said:
Could be, but they were well east of the Straight and away from the Iranian boarder. They were flying south of Pakistan at the time.

Sounds like the navigation problem was GPS jamming. I don't know how the 737-400 was equipped. The NGs, and later, have duel IRUs which VHF and GPS updating so loss of GPS only reducing your ANP (position accuracy), you don't lose the ability to navigate via RNAV.
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Everyone in the area was reporting GPS issues. So could be entirely unrelated to the crash.
 
Rick A said:
Bomb on board? Whatever happened was quick and deadly…
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A botched upset recovery is also quick and deadly with a triggering event being as simple as a system anomaly distraction or unexpected autopilot disconnect. Accident data shows both Boeing and Airbus products are susceptible.
 
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