Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Prescision Approach Path Indicator  
User currently offlineRotate777 From United States of America, joined Apr 2000, 400 posts, RR: 0
Posted (13 years 8 months 1 week 3 days 12 hours ago) and read 1474 times:

What are the prescision approach path indicators (PAPI lights) on the runway for? Thanks.

5 replies: All unread, jump to last
 
User currently offlineMD11Nut From , joined Dec 1969, posts, RR:
Reply 1, posted (13 years 8 months 1 week 3 days 11 hours ago) and read 1438 times:

It gives visual guide to whether you are on glideslope, above or below it.

User currently offlineDknhawkins From United States of America, joined Nov 2000, 13 posts, RR: 0
Reply 2, posted (13 years 8 months 1 week 2 days 20 hours ago) and read 1419 times:

When talking about PAPI's there are to types a 2 and 4 light system. Busyier airports use 4 light PAPI'S. It is used to fine tune your approach better than a VASI. 2 red 2 white your on the glide path, if your a little high you will see 3 white a 1 red, if your a little low you will see 3 red and 1 white. VASI'S do not have that feature. It only shows high, low or on the glide path. Its up to the pilot to determine how high or how low he/she is. Hope that helps.
Hawk


User currently offlineAzeem From Pakistan, joined Jul 2000, 137 posts, RR: 0
Reply 3, posted (13 years 8 months 1 week 2 days 8 hours ago) and read 1411 times:

They are your decision guide for adjusting your descent rate. In order to match the PAPI, you have to get 2 red and 2 whites...or 'red over white..you are all right'....and 'red over red....you arfe dead'. Anotehr sert of lights are VASI 'Visuakl Approach Slope Indicator'.

User currently offlineRalgha From United States of America, joined Nov 1999, 1614 posts, RR: 6
Reply 4, posted (13 years 8 months 1 week 2 days 6 hours ago) and read 1408 times:

PAPI and VASI are different things, PAPI is 4 lights in a row, red and white depending on your position relative to the glidepath, I won't define which means what since people have already done that.

VASI consists of light bars, up to as many as 3 rows, possibly on both sides of the runway. With the 3 row systems, you go by the upper two rows if you're in a high-cockpit aircraft, and the lower two if you're not.  



09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0
User currently offlineRalgha From United States of America, joined Nov 1999, 1614 posts, RR: 6
Reply 5, posted (13 years 8 months 1 week 2 days 6 hours ago) and read 1404 times:

After posting my last post I was unsatisfied with it sooooooo, here goes.

VASI (Visual Approach Slope Indicator): Consists of horizontal bars, one above the other (or a column of 3)

Using 2:
Both are red, you are below the glidepath
Top is red and bottom is white, you are on the glidepath,
Both are white, you are above.

Using 3:
If all are red, you are below both glidepaths
Top two are red, you are on lower glidepath
Only the top is red, you are on the upper glidepath
All are white, you are above both glidepaths.
-----------------------------------------------------

PAPI (Precision Approach Path Indicator):
Lights arranged in a row, four across.

All white, you are high (generally more than 3.5 degree descent path).
Far right red, you are slightly high (generally 3.2 degree path)
Right two red, you are on the path (generally 3 degree path)
Right three red, you are slightly low (generally 2.8 degree descent path)
All red, you are low (generally less than 2.5 degree descent path)
-----------------------------------------------------

PVASI (Pulsating Visual Approach Slope Indicator):
Single light unit that projects two colors, red and white, into the final approach path.

Pulsating White: Above glidepath
Steady White: On glidepath
Steady Red: Slightly below glidepath
Pulsating Red: Below glidepath
-----------------------------------------------------

Tri-Color:
Single light unit that projects a three-color beam into the approach area.

If you see

Amber: You are above the glidepath
Green: You are on the glidepath
Red: You are below the glidepath

If you are only slightly below the glidepath you may see a dark amber.
-----------------------------------------------------

Some runways have three painted plywood panels, usually black and white, or some high vis. color. They would be arranged in such a way so that:

If you are above the glidepath, the center panel appears to be above the other two

On the glidepath: the panels appear to be in a straight line

Below: the center panel appears to be below the other two

 



09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0
Top Of Page
Forum Index

Reply To This Topic Prescision Approach Path Indicator
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Prescision Approach Path Indicator posted Mon Nov 27 2000 05:08:32 by Rotate777
Approach Light Systems - France posted Wed Feb 7 2007 05:27:57 by Zed
Autothrottle On Approach posted Tue Feb 6 2007 03:49:47 by HighFlyer9790
Kai-tak Runway Landing + Approach Procedues posted Tue Dec 26 2006 22:22:11 by Jamesbuk
New Building Could Affect DCA Approach... posted Fri Dec 8 2006 19:19:21 by Bingo
Airport Depature And Approach Patterns posted Mon Dec 4 2006 00:51:20 by ANITIX87
BOS Runway 14/32 Approach posted Fri Sep 22 2006 16:19:00 by Vikkyvik
Approach Speed & Cruising Height posted Tue Aug 29 2006 18:42:54 by HKA
A Question On Transition From Star To Approach posted Thu Aug 17 2006 06:35:47 by Zarniwoop
Tag Near Brake Indicator Pin posted Sun Aug 6 2006 10:44:34 by HAWK21M

Sponsor Message:
Printer friendly format