SlimHeader

facebook_page_plugin
× Welcome to the IREX question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.

Descent In RNAV approach .

  • Posts: 11
  • Thank you received: 1

Sahil.vohra created the topic: Descent In RNAV approach .

G'day Bob and team !

Can you please through some light on solution of Q7 of CIR revision set Four .

You are tracking inbound to Ballarat from South for Ballarat RWY 36 RNAV Z prosecuted in VH-OZY . You intend to carry out the 3degree approach gradient as published on chart . the point at which you may commence descent from 4000 ft is :

C ) After passing BLZA and established on 288 M track to BLZSI.
D) 2.9 NM from BLZSF , the FF for approach .

Answer in solution key is C but I am also not able to understand why D is wrong and as in explanation it is mentioned that Min altitude from IAF is 2900 ft but it seems 2800ft to me ( please let me know if there is something wrong in my way of interpretation) .

As always , thank you so much for your time and help .

Regards
Sahil
#1

Please Log in or Create an account to join the conversation.

  • Posts: 1914
  • Thank you received: 99

bobtait replied the topic: Descent In RNAV approach .

The shaded areas below 2800ft are not part of the approach profile. They simply indicate the areas where terrain clearance cannot be assured. It was never intended that you fly level at 2800ft. If you inspect the distance/height table at the top, you will see that if you are going to do the 3° approach profile, you should remain not below 4000ft once you pass the initial approach fix and commence tracking 358° towards the final approach fix. From 4000ft, the 3° approach commences at 2.9nm from the final approach fix (7.9nm from the missed approach fix at the runway threshold). This gives you a chance to establish a stable approach to the runway.

It's not illegal to fly level at 2800ft on top of the shaded areas, but that's not the 3° approach profile the question required. It is also not the accepted method of flying the approach.

#2
Attachments:

Please Log in or Create an account to join the conversation.

  • Posts: 11
  • Thank you received: 1

Sahil.vohra replied the topic: Descent In RNAV approach .

Thank you so much for detailed explanation Bob.

But I am still not convinced with answer D as we are starting the decent only at 2.9 NM from BLZS , the FF for approach ( D).

Can you please let me know how C is correct as we can't descent after BLZSA if we follow the approach plate .
#3

Please Log in or Create an account to join the conversation.

Time to create page: 0.528 seconds