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Question About Airbus Gpws  
User currently offlinecvbcbcmv From United States of America, joined Jun 2011, 4 posts, RR: 0
Posted (2 years 6 months 4 days 20 hours ago) and read 5472 times:

Hey guys, I don't post here very often so please forgive me if there is a better section for this question, but I was just wondering...

When an airbus plane is landing, we'll use an a320 for example, somewhere around between 300 and 400 feet above the ground, and above one hundred feet (like it sounds) in my ears I hear something like, "hundred above." It sounds something like that to me. What is this actually and what does it mean? Any help is appreciated. (I'm not a pilot, let me just clear that up so nobody thinks I fly these planes and I'm asking a question like that)

I considered the possibility maybe it's 100 above minimums, but it still calls out approaching minimums so I don't see why they would do that.

4 replies: All unread, jump to last
 
User currently onlineMir From United States of America, joined Jan 2004, 21691 posts, RR: 55
Reply 1, posted (2 years 6 months 4 days 20 hours ago) and read 5460 times:

Quoting cvbcbcmv (Thread starter):
I considered the possibility maybe it's 100 above minimums,

I do believe that's it.

Quoting cvbcbcmv (Thread starter):
it still calls out approaching minimums so I don't see why they would do that.

Just an awareness tool for the pilots. If I didn't have a system that would do that for me, I'd want the other pilot to be making the same callout on an approach.

-Mir



7 billion, one nation, imagination...it's a beautiful day
User currently offlinelonghauler From Canada, joined Mar 2004, 5057 posts, RR: 43
Reply 2, posted (2 years 6 months 4 days 19 hours ago) and read 5451 times:

The auto call out function of the GPWS system of the A320 varies depending on the IFR approach used.

Starting with a Visual Approach, (as entered in the FMS), the call outs will be 500', 100', 50, 30, 20, 10. (Then a "retard"call, but that is not a function of the GPWS). These are heights above ground, as assessed by the radio altimeter.

On a Cat I, ILS approach, the call outs will be 400', 100', 50', 30', 20', 10'. Again, these heights are above ground. As an MDA is entered into the FMS and not a DH, the 100 above call is made by the pilot not flying, and responded by the pilot flying.

On a Cat 2 or 3 ILS approach, where a DH is entered into the FMS and not an MDA, the call outs are different. Basically, they are 400' (above ground), then "100 above" (height above the DH), then "minimum" (the DH), then the rest depends on whether it is a Cat 2, Cat 3 Single, or Cat 3 Dual approach. Where warranted, the 100, 50, 30, 20, 10 auto calls are made.

I say where warranted, as the DH is 100' AGL for Cat2, 50' AGL for Cat 3 Single, and No DH for Cat 3 Dual.

.... and you thought it was a simple question!



Never gonna grow up, never gonna slow down .... Barefoot Blue Jean Night
User currently offlinebueb0g From United Kingdom, joined Jul 2010, 648 posts, RR: 0
Reply 3, posted (2 years 6 months 4 days 7 hours ago) and read 5286 times:

Quoting cvbcbcmv (Thread starter):
When an airbus plane is landing, we'll use an a320 for example, somewhere around between 300 and 400 feet above the ground, and above one hundred feet (like it sounds) in my ears I hear something like, "hundred above." It sounds something like that to me. What is this actually and what does it mean? Any help is appreciated. (I'm not a pilot, let me just clear that up so nobody thinks I fly these planes and I'm asking a question like that)

You have it on some Boeing's too, for example BA's. Here's a video from the flightdeck of a 744:

http://www.youtube.com/watch?v=gMZPwzdGcTk

A female voice calls "50 above" and "decide", replacing "approaching minimums" and "minimums" before going back to the standard GPWS voice for 100. And yes, it does just mean minimums, but is somewhat more explicit.



Roger roger, what's our vector, victor?
User currently offlinecvbcbcmv From United States of America, joined Jun 2011, 4 posts, RR: 0
Reply 4, posted (2 years 6 months 4 days 1 hour ago) and read 5222 times:

Thanks for the answers guys, it's greatly appreciated!

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