Archives For AF447

MH370 underwater search area map (Image source- Australian Govt)

Bayes and the search for MH370

We are now approximately 60% of the way through searching the MH370 search area, and so far nothing. Which is unfortunate because as the search goes on the cost continues to go up for the taxpayer (and yes I am one of those). What’s more unfortunate, and not a little annoying, is that that through all this the ATSB continues to stonily ignore the use of a powerful search technique that’s been used to find everything from lost nuclear submarines to the wreckage of passenger aircraft.  Continue Reading…

AirAsia QZ8501 CVR (Image source - AP Photo-Achmad Ibrahim)

Stall warning and Alternate law

According to an investigator from Indonesia’s National Transportation Safety Committee (NTSC) several alarms, including the stall warning, could be heard going off on the Cockpit Voice Recorder’s tape.

Now why is that so significant?

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Triggered transmission of flight data

Why something as simple as control stick design can break an aircrew’s situational awareness

One of the less often considered aspects of situational awareness in the cockpit is the element of knowing what the ‘guy in the other seat is doing’. This is a particularly important part of cockpit error management because without a shared understanding of what someone is doing it’s kind of difficult to detect errors.

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Air France Tail plane (Image Source: Agencia Brasil CCLA 2.5)

Requirements completeness and the AF447 stall warning

Reading through the BEA’s precis of the data contained on Air France’s AF447 Flight Data Recorder you find that during the final minutes of AF447 the aircrafts stall warning ceased, even though the aircraft was still stalled, thereby removed a significant cue to the aircrew that they had flown the aircraft into a deep stall.

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Because they have typically pitch unity ratios (1:1) scales, aircraft primary flight displays provide a pitch display that is limited by the vertical field of view. This display can move very rapidly and be difficult to use in unusual attitude recoveries becoming another adverse performance shaping factor for aircrew in such a scenario. Trials by the USAF have conclusively demonstrated that an articulated style of pitch ladder can reduce disorientation of aircrew in such situations.

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