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After extending centerline, disarm nav or leave engaged

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After extending centerline, disarm nav or leave engaged

Old 4th Jun 2019, 18:01
  #1 (permalink)  
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Join Date: Oct 2013
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After extending centerline, disarm nav or leave engaged

Just wondering what opinions there are regarding this topic. During an approach that is radar vector, it is common in the airbus that from the fmgc, we would extend the runway centerline. After this operation the nav mode is armed whilst the aircraft if flying the heading to the intercept point if there is one. From experiance, most pilots I see instantly disarm this nav mode so the aircraft will maintain the heading assigned even if crossing through the centerline. However there are some that argue that this armed nav mode provides pilots with additional protection for example on runways with simultaneous parrallel approaches. Should the controller forget, or cannot get a word in on a busy frequency, the aircraft will establish by itself. Obviously the other method of thought is that the controller might not want you to establish and is diliberatly maintaining the heading assigned. Our ops manual doesn't mention if we should or should not leave it engaged. Good airmanship would suggest you contact ATC if in any doubt but I'm wondering what either ATC would expect from you or if some have it listed as sop.
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Old 4th Jun 2019, 18:30
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Join Date: Oct 2000
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If the controller is taking you through the centreline I would expect him to tell you.
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Old 4th Jun 2019, 18:49
  #3 (permalink)  
Join Date: Sep 2007
Location: Windsor, UK
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CDG is the only airport I know where it’s SOP to intercept the extended centreline even if not cleared unless the controller has specifically not told you to. As 95% of the approaches we fly are still ILS, I’d still disarm Nav and arm LOC instead.

The only time I’ve left Nav in blue is when cleared for an RNAV approach but on a heading. I’d extend the centreline from the FAF and leave it armed.

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Old 5th Jun 2019, 07:16
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Join Date: Jan 2004
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The instruction should be clear, explicit and pilots should left in no doubt as to whether they are expected to establish or are being taken through.

However, shit happens and as a rough rule of thumb I’d say if you’re on a closing heading (30 degree cut) establish and if you’re on a base leg (90 degree) do not.
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