Runway Lighting
This will probably confuze you, but I just learned this in tech school
This is what an ALSF-1 (Approach Lighting system with Sequenced Flashers, Category 1) looks like...
This is what an ALSF-2 system looks like...
Deleted from ALSF-1:
- Terminating Bar
- Pre-Threshold Wing Bar
Added:
- 500ft Bar
- Side Row Lights
Here is what the runway looks like...
Here's how the PAPI works...
Note the Air Force uses 4 PAPI units, so the pilot will see 4 lights.
The PAPI units use special lenses that if you are above the unit, you will see red, below white, and right on will see upper half red, lower half white... confuzed?
Each PAPI unit will have 2 or 3 individual lights, but to the pilot, each unit appears as one light
This is what you would see if you were straight on with a PAPI unit:
- If the pilot has the plane at the correct glide scope (3 degrees to the ground normally)
They will see the 2 left units as aviation white, and the 2 right units as aviation red.
- If the pilot is too low, the left units will progressively turn aviation red
- If the pilot is too high, the right units will progressively turn aviation white
If the pilot were too have too high of a glide slope, they may run out of runway; if they are too low, they will hit the runway sooner than they planned...
All this was done in Windows Paint, yay!
Email me at kaneo666@yahoo.com if you would like to use these pictures, thanks.
Last Modified: Monday, 16-Aug-2004 18:25:24 EDT.
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