Document 9913
Rev. V
Instruction Manual
Style 3
Runway Centerline Light L-850A & Touchdown Zone Light L-850B
10
9.11.1
Regular cleaning is necessary in order to insure that inset lighting fixtures operate at maximum efficiency. The
lens and channel in front of the lens should be cleaned periodically with a soft cloth and solvent. The weather
and the location of the fixtures will dictate the regularity and type of cleaning.
9.11.2
Snowplow operators should exercise extra care not to strike the light fixtures with snowplow blades. After
snowplow removal operations, inspect all light fixtures 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 fixtures, they should be traveling at less than 5 mph or have the
blades lifted clear of the fixtures.
9.11.3
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 fixture. To prevent this from
occurring, it is recommended that each fixture be inspected for the presence of water at least once a month. More
frequent inspection is desirable during and following rainy seasons.
9.11.4
Optical Assembly and support ring hold-down bolts should be checked for proper torque per section 8.2.
9.11.5
If any fixture contains water, the water should be removed and the entire fixture cleaned and dried. Perform a
pressure test per paragraph 9.8 to locate the source of the leak. Replace the bottom cover gasket or o-ring; see
Section 9.3, 9.4 and 9.5.
