DOCUMENT 1331
REV. C
Instruction Manual
PRO APF Series LED
Inset Runway Guard Light L-852G
13
10.2.3 Snowplow operators should exercise extra care not to strike the light units with snowplow blades.
Use rubber blades for added protection to the unit. After snow removal operations, inspect all
light units to locate and replace, if necessary, any damaged light assemblies. Passes over the light
rows should be made with a power broom only if practical. Whenever snowplows must traverse
in-pavement light units, they should be traveling at less than 5 mph or have the blades lifted clear
of the unit. Recommended snow removal techniques are described in AC 150/5200-23.
10.2.4 The light is designed to exclude both ground and surface water from entering. If the lights are not
properly maintained (i.e., bolts tightened and seals in good condition) water may enter the unit.
To prevent this from occurring, it is recommended that each unit be inspected for the presence of
water at least once a month. More frequent inspection is desirable during and following rainy
seasons.
10.2.5 If any light unit contains water, the water should be removed and the entire unit cleaned and
dried. If any of the electronics have been damaged, it may not be cost effective to make a field
repair, but rather send it back to Crouse-Hinds Airport Lighting for rebuild. Perform a pressure
test per Section 10.10 to locate the source of the leak. Refer to the o-ring, lens, and power lead
sections, 10.5, 10.6, & 10.7 as needed to make repairs. After any repair, pressure test again per
Section 10.10.
10.3 Cleaning Lenses
With a compressed air blast or suitable brushes, remove all accumulated debris from the light channel.
Clean the outer lens surface with a detergent solution. If the lens is coated with a substance impervious to
the detergent, a suitable solvent should be sparingly applied with a wad of cotton or a patch of cloth on
the end of a wood splint. After the solvent has acted, the remaining solvent and softened coating should
be removed with a clean piece of cotton or cloth. Care should be taken to avoid excessive contact
between the solvent and the lens seal. Remove all remaining solvent from lens and lens seal. A gentle air
blast may be used. It is good practice to inspect for damage to the optical housing and/or water intrusion
into the unit anytime a lens is cleaned. Water droplets would be visible on the inside of the lens if
moisture had entered the unit. If it is determined that moisture has entered the unit, refer to Section 10.2.5
for possible causes and maintenance procedures.
NOTICE
NOTICE:
The LED PCB is warm when light unit is energized and remains warm for a
short time after unit is turned off.
