GoldenRivet |
03-24-14 02:04 PM |
It is misleading to use the term "black box" and the media is guilty of using this "dumb down" term more than anything
Not only are these boxes painted high visibility orange, but there are generally two separate pieces of tech which are often referred to as a single "Black Box" or plural "Black Boxes"
first is the Cockpit Voice Recorder or CVR
Second is the Flight Data Recorder of FDR
Usually separate devices
The CVR only records sounds that occur which are audible within the cockpit of the aircraft, for the past 8 or 9 years, regualtions have required that only the preceding 30 minutes of flight deck sounds be recorded, despite the NTSB recommendation of 2 hours.
The FDR records a set of conditions, control positions, switch positions, speeds, altitudes, rates of acceleration/ deceleration, active warnings etc
While convenient, especially in a case such as this, accidents can be solved with a high degree of certainty even in situations where the CVR fails to record a single sound... especially if the FDR data is recoverable.
So it is possible that the CVR will produce 30 minutes to 2 hours of silence, while the FDR, if ever recovered will tell a story all it's own.
given information that puts the aircraft in the southern Indian Ocean, in addition to the information which suggests that Lithium Batteries were recently installed on the aircraft, it is plausible that the crew and passengers were overcome with noxious fumes when the batteries overheated, with electrical systems possibly affected in some way, the crew turned back, only to fall victim to the fumes and pass out, at this point the aircraft would have remained on its new course until fuel was exhausted.
Occam's razor: Given a series of competing theories or hypothesis, the one that makes the fewest assumptions is generally the one that is correct.
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