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Old 17th Jan 2011, 11:43
  #1086 (permalink)  
RetiredF4
 
Join Date: Jun 2009
Location: Germany
Age: 71
Posts: 776
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What is so unbelievable of a few simple failures?

We know nearly without doubt, that the crew

- had limited expierience with this type of approach
- showed limited knowledge of the autopilot systems
- started the descent late
- was steep on descent
- was fast on descent
- used the RA (Nav) or the wrong set up of the PICīBA as Altitude reference
- briefed the intention to go around with autopilot (although not possible)

So it unfolds quite obvious without much assumption (which is the mother of all f**ck*p):


See Figure 45 of the report as reference:
Forget the regular decision height at 10:40.42, they didnīt get that one.
The crew flew down to RA 100 meters (which is below the minimum)
Therefore for them everything looks nice till 10:40:49, being still at 100 meters (RA), and time for goaround. The FO even calls it normal. And ATC gave the last information as being on glidepath.

Only one second later at 10:40:50 the nav calls 80 (rising terrain and high descent rate), and the FO calls go around 1 Sekond later at 10:40:51. He even initiates a pull up with the stick, which did not disconnect the autopilot, but was well recorded from the FDR.

Somewhere beetween 10:40:43 (First time NaV 100) and 10:40:51 the decision to goaround was made (based on the wrong altitude information) and if they did it like planned, they hit the go around button to let the automatics do the hard work.

But nothing happens, so another 5 Seconds with disbelief and panic pass by, until the throttles had been jammed to max power at 10:40:56.

Sit yourself in the chair and look, how fast those only 6 seconds from "everything normal" to "oh my god" pass by.

Limited able crew, bad weather, reliance on automatics and a not very helpful ATC station, thatīs it.

But this simple chain of events is neither good for the media nor for the politicians on both sides.

So the assumptions will continue on and on.

franzl

Last edited by RetiredF4; 17th Jan 2011 at 21:38.
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