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Old 7th May 2014, 07:12   #9 (permalink)
alphacentauri
 
Join Date: May 2006
Location: Australia
Posts: 336
In late 2008 there was an amendment to PANS-OPS RNAV design criteria (amendment 13 I think) The amendment, amongst other things, reduced the width of the protection area for RNAV approaches. The reduction in width meant that certain obstacles that had been controlling for the design, could now be excluded all together or have a reduced obstacle clearance value applied. This allowed the approach to be re-aligned and further optimised. The opportunity was therefore taken to try and improve the approach where this option had not been previously available.

You will note the procedure was amended in Nov 2009, only 12 months after the ICAO amendment. Noting the normal time to get a new procedure published, this must have been one of the first approaches they looked at improving after the amendment became effective.

The ATSB had the approach independently verified and flight validated. It was correctly designed and depicted according to the rules of the day. There was nothing wrong with the approach

Alpha


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