JFK 22L VGSI and TCH
Thread Starter
Joined: Apr 2008
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From: Test
JFK 22L VGSI and TCH
Hi there,
JFK or for some matter, some other airports as well, sometimes the VGSI TCH and GS TCH are different. In JFK 22L ILS, VGSI TCH is 66ft whereas GS TCH is 53ft, does it mean if I follow the G/S, the PAPI will become 3 reds at some point? Is my understanding correct? Even though the diff of 66ft and 53ft might not seem much.
Thanks for taking the time to reply.
With Regards
JFK or for some matter, some other airports as well, sometimes the VGSI TCH and GS TCH are different. In JFK 22L ILS, VGSI TCH is 66ft whereas GS TCH is 53ft, does it mean if I follow the G/S, the PAPI will become 3 reds at some point? Is my understanding correct? Even though the diff of 66ft and 53ft might not seem much.
Thanks for taking the time to reply.
With Regards
Joined: Jan 2004
Posts: 3,247
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From: Here and there
See the thread / discussion at :-
YMML MEHT
Oh, but that was your thread; so what exactly is the issue, what is not understood ?
YMML MEHT
Oh, but that was your thread; so what exactly is the issue, what is not understood ?
Joined: Mar 2002
Aviation Qualifications: ATPL
Posts: 9,226
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From: Seat 1A
Originally Posted by Extricate
does it mean if I follow the G/S, the PAPI will become 3 reds at some point?
13ft vertical is equivalent to 247ft long the runway. Have a play with my Glidepath spreadsheet here.
You can work out what you'll see using the angles of each light; assuming it's a PAPI:
That image came from this document:
https://web.archive.org/web/20230301...0914_13813.pdf
Joined: Jan 2022
Posts: 106
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From: Miami
according to the AIM (indeed, not regulatory), a PAPI provides safe obstruction clearance within plus or minus 10 degrees of the extended runway centerline and to 3.4 NM from the runway threshold.
I am not a big PAPI guy, instead use the G/S or Vertical G/P, on the approach, until about 100 feet or so. Every time.
I am not a big PAPI guy, instead use the G/S or Vertical G/P, on the approach, until about 100 feet or so. Every time.
Joined: Mar 2002
Aviation Qualifications: ATPL
Posts: 9,226
Likes: 995
From: Seat 1A
Originally Posted by 321XLR/FAA AIM
a PAPI provides safe obstruction clearance within plus or minus 10 degrees of the extended runway centerline and to 3.4 NM from the runway threshold.
Joined: Jan 2022
Posts: 106
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From: Miami
I suspect that means OUT TO. All the action happens approaching and under 1000ft so it would be pretty pointless having a system that is only supposed to be used outside 3.4nm. And they are certainly useable close-in. A quick glance when over the threshold would tell me if Bloggs was going to land long.
