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Questions tagged [papi]

Papi is the short for "Precision approach path indicator". It's a visual aid providing guidance information to help a pilot acquire and maintain the correct approach.

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4answers
217 views

Do different planes (category) aim differently in the 'final stages before flaring'?

(youtube.com) Do different planes (categories A through D) aim differently in the final stages before flaring? I'm asking about precision runways. The reasons I ask: An ILS' glide slope is not ...
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3answers
515 views

Does a pilot follow the PAPI lights in the same way in all categories of aircraft?

Since there are different dimensions of aircraft in various approach categories, I wonder what changes pilots in different aircraft have to make when following the PAPI lights. I know that 3° (for ...
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0answers
89 views

Distance of APAPI lights from thrshold without ILS

I require eye to wheel height (EWH) of Twin Otter Aircraft (DHC-6 400 series) to calculate the distance of APAPI lights from Threshold. Specification for the Twin Otter is available but no information ...
3
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3answers
329 views

Why is an approach that relies on both LOC and PAPI not considered a precision approach?

I am an aviation layman. I am reading about PAPI lighting system and it seems like it provides vertical guidance, just like the glideslope component of an ILS. Coupled with a LOC, both vertical and ...
6
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3answers
1k views

Why would a PAPI and ILS glide slope for the same runway not coincide?

Some pilots are reporting the glide slope on our PAPI is not coinciding with the glide slope on our ILS even though FAA did a flight check of our PAPI's. Are there any reasons why a PAPI and ILS would ...
7
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1answer
1k views

What is the horizontal and vertical fields of view for a VASI and a PAPI approach system as you come in to land?

As you come in for landing, at what angles should the VASI or PAPI lights be visible on the approach in the Horizontal and vertical planes. {E.G. 30 degrees horizontal and 20 degrees vertical}
9
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2answers
6k views

What determines the positioning of PAPI lights from the runway threshold?

Why are PAPI lights installed 300m from the threshold? What are the conditions that define the position of the PAPI lights from threshold?
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2answers
2k views

How to decide on which side of the runway the approach path indicator (VASI, PAPI) are placed?

This answer provides pictures and drawing of implementation of both PAPI and VASI. In all pictures I found, I cannot figure if there is a rule to put those lights on the right, on the left, or on both ...
7
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2answers
2k views

How to know if an airport has PAPI lights?

Is there any way to identify whether an airport has PAPI lights (2-light or 4 light system, doesn't matter)? I am working on some map generation and using aerial images to identify PAPI lights for ...
36
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4answers
26k views

How do PAPI lights work?

Usually, there are four lights at the sides of runways which show airplanes' altitude status: four red lights: too low two red, two white: appropriate altitude four white lights: too high. If two ...
24
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2answers
59k views

What's the functional difference between PAPI and VASI?

PAPI and VASI seem to be very similar in the the information they provide - i.e. are you on the glide slope or off it. Is there a functional difference between the two? If there is a difference, and ...