5. For 2-bar VASI (4 light units) see FIG 2-1-2.
FIG 2-1-2

2-Bar VASI

Far Bar
Near Bar

Below Glide Path

On Glide Path

Above Glide Path

6. For 3-bar VASI (6 light units) see FIG 2-1-3.
FIG 2-1-3

3-Bar VASI

Far Bar

Middle Bar
Near Bar

Below Both
Glide Paths

On Lower
Glide Path

On Upper
Glide Path

Above Both
Glide Paths

7. For other VASI configurations see FIG 2-1-4.
FIG 2-1-4

VASI Variations

2 Bar
2 Light Units
On Glide Path

Airport Lighting Aids

2 Bar
12 Light Units
On Glide Path

3 Bar
16 Light Units
on Lower Glide Path

2-1-3