Go Back  PPRuNe Forums > Aircrew Forums > Biz Jets, Ag Flying, GA etc.
Reload this Page >

PAPI - How low can you go?

Biz Jets, Ag Flying, GA etc. The place for discussion of issues related to corporate, Ag and GA aviation. If you're a professional pilot and don't fly for the airlines then try here.

PAPI - How low can you go?

Old 17th Sep 2015, 07:49
  #1 (permalink)  
Thread Starter
 
Join Date: Mar 2002
Location: Mid-central South of England
Posts: 189
Question PAPI - How low can you go?

Just as general interest and back ground but: how low are PAPI guidance lights supposed to take you? I have found in manufacturers blurb info suggesting that following 2R 2W down to as close as 300yds and roughly 15m to be accurate that, for a large aircraft doesn't seem feasible. From MDA/DA (substitute H as required) you're "in the groove" and at some in defined point transition to some sort of flare and landing attitude is going to happen such that you arrive on the black top in the touchdown zone. Crossing the threshold at a nominal 50' of course when you're main wheels are some 34 FT below you and perhaps the receiver aerial for the ILS and you're view of the PAPIs don't all match up......
Standing by for criticism for not knowing the answer
But also hopeful of some good he.......
Axel-Flo is offline  
Old 17th Sep 2015, 07:54
  #2 (permalink)  
 
Join Date: Feb 2010
Posts: 1,739
Well they don't have any regulatory minimums of course - but I guess you know that. As for how low are they accurate, I think it is down to the published MEHT (Minimum eye height threshold).
Trim Stab is offline  
Old 18th Sep 2015, 17:06
  #3 (permalink)  
Thread Starter
 
Join Date: Mar 2002
Location: Mid-central South of England
Posts: 189
MEHT

Absolutely yes but can't find the published one for the airfield in question. Also it will depend upon the type, size and attitude/configuration of the aircraft. What works say for a fast jet won't for a big turbo prop or a lifting body style airliner. All size wise dissimilar and pilots eye height to aerial position incomparable. Seems very much that one set of lights won't fit all unless using all available clues they are as much a guide as a Precision approach path indicator....
Axel-Flo is offline  
Old 18th Sep 2015, 17:25
  #4 (permalink)  
 
Join Date: Oct 2001
Location: England
Posts: 648
PAPI

Take a look at this thread http://www.pprune.org/tech-log/56301...ow-300-ft.html
Miles Magister is offline  
Old 18th Sep 2015, 19:58
  #5 (permalink)  
Thread Starter
 
Join Date: Mar 2002
Location: Mid-central South of England
Posts: 189
Cool

Brilliant, thanks...just what I was looking for and hadn't realised it was there. Just too old to be a fan of the search facility to my eternal shame obviously...
Axel-Flo is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.