A320 landing "G" factor
Thread Starter
Joined: Apr 2014
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From: Chennai,India
A320 landing "G" factor
I have recently started analyzing the smoothness of my landings and the pitch at which I touchdown, primarily to cross check if the pitch values that I perceive I'm landing at is anywhere close to the actual aircraft pitch. From what I have inferred from various threads on this forum, it is the VRTA value in the S3 row of the load factor report, that gives you the g loads at the time of landing.On analyzing some of my recent landings I was surprised to note sometimes the landings which I felt were incredibly smooth and were duly appreciated by the captain, in fact carried a 'g value' several echelons above landings which I perceived to be not so on the smooth side.
Is it that the g values are prone to discrepancies to a certain extent or am I missing some part of the larger picture? And secondly there's a row of values below the s3 line which have their label as s4. What do the terms s3 and s4 refer to?
Is it that the g values are prone to discrepancies to a certain extent or am I missing some part of the larger picture? And secondly there's a row of values below the s3 line which have their label as s4. What do the terms s3 and s4 refer to?
Last edited by Bkdoss; 30th April 2015 at 11:15.
Joined: May 2007
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From: Dark Side of The Moon
Unless its a hard landing, most of the time the 'g' factor is not the deceleration due to the ground contact, but the 'g' you pull during flare.
The more representative field is the vertical rate in feet/second.
Multiply by 60 to get the touch down sink rate in feet/minute.
Hope this helps
The more representative field is the vertical rate in feet/second.
Multiply by 60 to get the touch down sink rate in feet/minute.
Hope this helps
Thread Starter
Joined: Apr 2014
Posts: 57
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From: Chennai,India
"The more representative field is the vertical rate in field per sec"
Alright, seems I was looking in the wrong direction all the while. Can you please throw light on which field in the load report indicates vertical sink rate?
Alright, seems I was looking in the wrong direction all the while. Can you please throw light on which field in the load report indicates vertical sink rate?
Thread Starter
Joined: Apr 2014
Posts: 57
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From: Chennai,India
Amadis of Gaul
I have just got into this comfort zone where I have the confidence to pull off a landing with almost complete control, my primary aim being the centre line and the 1000 ft marker. And sometimes the smoothness of the landings and being appreciated by the skipper or the passengers give me a sense of high for the day.
Flex 330
I can say with reasonable confidence that the decoding of the load report is not listed in the fctm. I'd be more than happy to be proved otherwise.
I have just got into this comfort zone where I have the confidence to pull off a landing with almost complete control, my primary aim being the centre line and the 1000 ft marker. And sometimes the smoothness of the landings and being appreciated by the skipper or the passengers give me a sense of high for the day.
Flex 330
I can say with reasonable confidence that the decoding of the load report is not listed in the fctm. I'd be more than happy to be proved otherwise.
Joined: Jan 2000
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From: Asia
This is normally done by engineering and our company cautioned us against trying to use the FMS to determine if a landing qualified as hard or not.
Suspected hard landings to be written up in the tech log and left up to the engineers to determine.
Suspected hard landings to be written up in the tech log and left up to the engineers to determine.
Joined: Jul 2003
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From: Uk
Bkdoss,
Just out of curiousity. I noticed one of our trainers did it once during a line ftaining flight. Which options in the acars do you use to get the report? I dont wamt to screw around in the menu without being sure.
Thanks!
Just out of curiousity. I noticed one of our trainers did it once during a line ftaining flight. Which options in the acars do you use to get the report? I dont wamt to screw around in the menu without being sure.
Thanks!
Thread Starter
Joined: Apr 2014
Posts: 57
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From: Chennai,India
Safelife and metroman,
Even if left to the engineers to determine,there has to be some metric to quantify a landing as hard landing right? It for sure can't be left to an engineer's discretion IMHO. In my company at least the engineers depend on the load factor report, which from my evaluation is grossly unreliable.
Even if left to the engineers to determine,there has to be some metric to quantify a landing as hard landing right? It for sure can't be left to an engineer's discretion IMHO. In my company at least the engineers depend on the load factor report, which from my evaluation is grossly unreliable.
