Comments on: An ILS where the DA is higher than the MDA http://www.askacfi.com/1432/ils-with-da-higher-than-mda.htm Flight Training Questions Answered Thu, 11 Mar 2010 18:02:41 -0500 http://wordpress.org/?v=2.9.2 hourly 1 By: Rafael Sierra, CFII http://www.askacfi.com/1432/ils-with-da-higher-than-mda.htm/comment-page-1#comment-1396 Rafael Sierra, CFII Mon, 16 Nov 2009 14:26:39 +0000 http://www.askacfi.com/?p=1432#comment-1396 Higher or lower visibilty is based on the missed approach distance from the Threshold and higher DA is based on the OCS or Obstacle Clearance Surface requirements. for ILS or LPV, LNAV/VNAV and Cat of aircraft. Order_8260.54A.pdf helps explain all this. Higher or lower visibilty is based on the missed approach distance from the Threshold and higher DA is based on the OCS or Obstacle Clearance Surface requirements. for ILS or LPV, LNAV/VNAV and Cat of aircraft. Order_8260.54A.pdf helps explain all this.

]]> By: Paul http://www.askacfi.com/1432/ils-with-da-higher-than-mda.htm/comment-page-1#comment-1343 Paul Wed, 14 Oct 2009 03:39:47 +0000 http://www.askacfi.com/?p=1432#comment-1343 Yesterday I called the FAA about this approach and they called me back today. Here's the scoop: 1) The ILS has already changed as of 22-OCT-09. The new ILS DA is 216 with 3/4 required visibility 2) The FAA representative that I talked to shed some light on the subject by saying that the previous DA might be related to the CAT D missed approach. The new approach has removed CAT D missed approach procedure. (You can't shoot this approach in a CAT D aircraft) 3) He did say, that most likely the higher minimums were due to some ostacle that was penetrating the clearance plane as Eric indicated. 4) He also said that you can see this same behavior in the new RNAV approaches. There are times where the LPV DA will be higher than the LNAV / VNAV or LNAV only minimums. Yesterday I called the FAA about this approach and they called me back today. Here’s the scoop:

1) The ILS has already changed as of 22-OCT-09. The new ILS DA is 216 with 3/4 required visibility

2) The FAA representative that I talked to shed some light on the subject by saying that the previous DA might be related to the CAT D missed approach. The new approach has removed CAT D missed approach procedure. (You can’t shoot this approach in a CAT D aircraft)

3) He did say, that most likely the higher minimums were due to some ostacle that was penetrating the clearance plane as Eric indicated.

4) He also said that you can see this same behavior in the new RNAV approaches. There are times where the LPV DA will be higher than the LNAV / VNAV or LNAV only minimums.

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