UFC 3-535-01
17 November 2005
Figure 3-12. PAPI Configuration
A. TOO LOW
B. SLIGHTLY LOW
RED
C. CORRECT
WHITE
D. SLIGHTLY HIGH
APPROACH
E. TOO HIGH
ANGLE
PAPI PATTERNS AS SEEN FROM THE APPROACH ZONE
9M 0.3M
+3M
15M
-0M
(30FT 1 FT)
+10FT
50FT
TYPICAL
-0 FT
PAPI WING BAR
A
B
C
D
RUNWAY
L = DISTANCE OF PAPI WING BAR FROM RUNWAY
THRESHOLD
= 285M (950FT) FOR IDEAL 3 DEGREE APPROACH
SLOPE ANGLE (954 FEET GIVES A 50 FOOT
EYE-TO-THRESHOLD HEIGHT - 19/1 RATIO)
THRESHOLD
= PAPI LIGHT SOURCE UNIT
3-7.3
Photometric Requirements
PAPI light units must be capable of satisfying the intensity requirements given in Figure
3-13 at the maximum intensity setting.
3-7.3.1
PAPI systems must be capable of operating at five intensity settings as
follows:
Step
Percentage of Full Intensity
*1
0.16
2
0.8
3
4.0
4
20.0
5
l00.0
*The Step 1 setting may not be sufficient to heat the lamp filaments adequately and
provide proper color definition. Where this is a problem, consult the manufacturer on
how to bypass this setting.
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