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 MIL-HDBK-1023/4
Table A-3
High Intensity Approach Lighting Systems With Flashers (ALSF-1/ALSF-2)
Tolerance / limit
Parameter
Standard
Initial
Operating
1. Light units operational
a. Steady burning
All
All
15% lamps out (random) - 2
lamps out; in 5-light bar - 1
light bar out
b. Flashing
All
1 unit out
All
2 fpm
2 fpm
2. Flashing rate
120 fpm
5%
3%
3. Input voltage
120 V or 240 V
4. Light unit alignment
2 degrees
1 degree
a. Vertical
Locally established
2 degrees
1 degree
b. Horizontal
Parallel to runway
centerline
5. Obstructions due to
No obstruction
Same as standard
Same as
vegetation, etc.
standard
118
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