PPRuNe Forums - View Single Post - Air Asia Indonesia Lost Contact from Surabaya to Singapore
Old 2nd Dec 2015, 15:59
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peekay4
 
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@sooty3694
and 3 seconds later a sound similar to a seat motion is heard
It's a philosophical call regarding how much to include "based on speculation" vs. based on facts that can be proven.

E.g., the sound "similar" to seat motion was speculative (it may or may not actually have come from seat motion) -- and in any case unnecessary to be included, so it was omitted from the official transcript.

There is a big difference between the two statements, especially when one considers the definitions of fluctuating and unavailable.
Again the Indonesians were (correctly) conservative in this case, since the FDR data actually shows the parameters to be fluctuating between min and max, not unavailable.

See for example the graph on top of Page 48. When FAC 1 was reset, the TLU1 parameter (green) fluctuated between 0 and 1. Similarly when FAC 2 was reset, the TLU2 parameter (blue) fluctuated between 0 and 1.

Similarly the Wind Shear Detection parameters 1 & 2 (purple and black) fluctuated during these periods. They did not become "unavailable".
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