Delta Virtual Airlines Water Cooler | Airline Operations |
PSS 757 touchdown at -6 feet |
DVA10553
First Officer, B737-800
Joined on February 16 2012
Atlanta, GA USA
20 legs, 53.3 hours
9 legs,
22.0 hours online 18 legs,
47.7 hours ACARS
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Posted onPost created on
February 26 2012 19:44 ET by Lucas Makhviladze
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Hello (Sorry I don't know in which part of forum I should post so I posted here)
My problem is that when ever I'm landing with PSS 757 my touchdown is at -6 feet instead of 0. Can you help me how to correct it? (I mean AGL Altitude on PFD panel)
Thanks
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DVA7752
First Officer, B747-400
OLP
Joined on August 21 2009
50 State Club
DVA Five-Year Anniversary
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"Turbulence just makes you have to go worse..." Parker, CO USA
411 legs, 942.0 hours
246 legs,
564.4 hours online 389 legs,
904.0 hours ACARS 17 legs,
27.3 hours event
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Posted onPost created on
February 26 2012 20:15 ET by Greg Stark
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press B to change the barometer setting.
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DVA10553
First Officer, B737-800
Joined on February 16 2012
Atlanta, GA USA
20 legs, 53.3 hours
9 legs,
22.0 hours online 18 legs,
47.7 hours ACARS
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Posted onPost created on
February 26 2012 20:34 ET by Lucas Makhviladze
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Greg Stark wrote:
press B to change the barometer setting.
It doesn't help. B works for MSL only.
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DVA10082
Captain, B777-200
OLP
Joined on August 17 2011
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"Set your compass to 'E' and get out of my airspace!" Monroe, LA
2,382 legs, 7,645.4 hours
1,958 legs,
5,969.1 hours online 2,347 legs,
7,551.6 hours ACARS 104 legs,
243.6 hours event 366 legs dispatched, 255.4
hours
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Posted onPost created on
February 26 2012 20:44 ET by Josh Burr
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it's probably, that the reader is 6 feet off the ground, not right on the tire...
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DVA10553
First Officer, B737-800
Joined on February 16 2012
Atlanta, GA USA
20 legs, 53.3 hours
9 legs,
22.0 hours online 18 legs,
47.7 hours ACARS
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Posted onPost created on
February 26 2012 21:06 ET by Lucas Makhviladze
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Josh Burr wrote:
it's probably, that the reader is 6 feet off the ground, not right on the tire...
Do you know how to fix it?
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DVA10082
Captain, B777-200
OLP
Joined on August 17 2011
50 State Club
Event Half Century Club
Tin Dispatcher
DVA Ten-Year Anniversary
Globetrotter
Online Fifteen Century
Bi-Millennium Club
Three Million Mile Club
US Coastal Club
US Mountaineer Club
Everett Bi-Millennium Club
"Set your compass to 'E' and get out of my airspace!" Monroe, LA
2,382 legs, 7,645.4 hours
1,958 legs,
5,969.1 hours online 2,347 legs,
7,551.6 hours ACARS 104 legs,
243.6 hours event 366 legs dispatched, 255.4
hours
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Posted onPost created on
February 26 2012 21:08 ET by Josh Burr
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No fix, I think its just the way it is, even in real world aircraft....sorry
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DVA9677
Captain, B737-800
OLP
Joined on April 11 2011
50 State Club
Online Double Century Club
Quincentenary Club
"American 1482, your APU is leaking baggage." Kissimmee, FL USA
543 legs, 735.9 hours
247 legs,
299.2 hours online 538 legs,
725.6 hours ACARS 2 legs,
2.8 hours event
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Posted onPost created on
February 26 2012 22:35 ET by John Anderson
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Josh is right. If you were to open the door and fall out of the aircraft, you'd fall 6 feet.
PMDG's 737 is 4 feet
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DVA5973
Captain, B757-200
Joined on May 25 2008
B757 100 Club
Million Mile Club
Everett Millennium Club
Flying Colonel
DVA Fifteen-Year Anniversary
Atlanta, GA
1,513 legs, 4,690.1 hours
1,459 legs,
4,569.9 hours ACARS
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Posted onPost created on
February 27 2012 14:41 ET by Joe Coughlin
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That's correct, it will always read -6. I was thinking that as well the other day when I was flying the 75.
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DVA853
Senior Captain, B747-400
OLP E-MAIL
Joined on September 26 2002
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Rincon, GA
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10.0 hours event 376 legs dispatched, 185.3
hours
CURRENTLY LOGGED IN
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Posted onPost created on
February 27 2012 15:09 ET by Chris Hannigan
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John Anderson wrote:
Josh is right. If you were to open the door and fall out of the aircraft, you'd fall 6 feet.
I'll admit... I chuckled...
Chris HanniganSenior Captain, B747-400
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DVA1763
Senior Captain, B757-200
Joined on June 29 2004
Everett 250 Club
Online Six Century Club
DVA Ten-Year Anniversary
Seven Century Club
Oklahoma City, OK
723 legs, 2,015.0 hours
645 legs,
1,824.0 hours online 585 legs,
1,608.7 hours ACARS 10 legs,
44.8 hours event 740 legs, 2,044.9 hours total
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Posted onPost created on
February 27 2012 15:12 ET by Steve Pickle
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This is because the radio altimeter is calibrated to show 0 in the flare phase of landing. At that pitch up attitude the radar will travel further to the ground than when the nose is level, thus the negative reading when the nose in on the ground. Does that make sense? I had a really hard time trying to explain this for some reason..haha
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DVA9677
Captain, B737-800
OLP
Joined on April 11 2011
50 State Club
Online Double Century Club
Quincentenary Club
"American 1482, your APU is leaking baggage." Kissimmee, FL USA
543 legs, 735.9 hours
247 legs,
299.2 hours online 538 legs,
725.6 hours ACARS 2 legs,
2.8 hours event
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Posted onPost created on
February 27 2012 15:56 ET by John Anderson
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Actually makes alot of sense, and I understand now that I was wrong.
(Was thinking about the Kings, the top number is what your altimeter will read when you hit the obstacle and the bottom number is how far you'll fall after hitting it.
[a trip down memory lane])
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DVA2301
Captain, B777-200
COMM
Joined on April 25 2005
Everett Century Club
Double Century Club
DVA Ten-Year Anniversary
Baltimore, MD USA
264 legs, 820.6 hours
90 legs,
221.0 hours online 234 legs,
757.3 hours ACARS
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Posted onPost created on
February 28 2012 14:40 ET by Andrew Logan
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After playing with the PSS 75, I think it's a "simism". In the flare, the radar altimeter goes through 0 and wheel touchdown is at -6. If I had to venture a guess I would say it was probably a coding issue. Radar altimeters are supposed to be calibrated to the wheel height, so when they are 0, the wheels are on the ground. This isn't always the case since there are always things playing tricks on the radar altimeter.
Also as a frame of reference... the QW 757 shows a radar altimeter altitude of 1 when on the ground. I didn't get to look at the CS 757 since I don't have it.
EDIT: I also checked some pics I have from the ERJ, and it shows us at 0 when on the ground too.... So I'm sticking with the probably a coding error from PSS.
Andrew LoganCaptain, B777-200
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DVA2301
Captain, B777-200
COMM
Joined on April 25 2005
Everett Century Club
Double Century Club
DVA Ten-Year Anniversary
Baltimore, MD USA
264 legs, 820.6 hours
90 legs,
221.0 hours online 234 legs,
757.3 hours ACARS
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Posted onPost created on
February 28 2012 15:02 ET by Andrew Logan
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Steve Pickle wrote:
This is because the radio altimeter is calibrated to show 0 in the flare phase of landing. At that pitch up attitude the radar will travel further to the ground than when the nose is level, thus the negative reading when the nose in on the ground. Does that make sense? I had a really hard time trying to explain this for some reason..haha
Steve, the reason this is incorrect, is that in your setup the Radar Altimeter would be on the nose of the aircraft. Since during the flare the nose is higher than when on the ground, you would then want it to read 0, and negative when on the ground.
However, we don't much care about the nose in the flare, the main concern is the tail (no one likes a tail strike). So, if the sensors were to be calibrated to show 0 in the flare attitude and mounted on the rear of the aircraft, you would show a positive number when on the ground. The Dash-8 did this. The Radar Altimeter on that plane was mounted on the tail. So during the flare we would get down to 0 and then when on the ground and level, the plane would show 5.
Andrew LoganCaptain, B777-200
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DVA10526
First Officer, MD-11
Joined on February 07 2012
Várpalota, Veszprém HU
30 legs, 209.4 hours
25 legs,
184.7 hours online 27 legs,
183.6 hours ACARS
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Posted onPost created on
February 28 2012 15:19 ET by Zsolt Horvath
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By the way, is there any radar altimeter indicator in the CS 767?
Zsolt HorvathFirst Officer, MD-11
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