Document UT-MT-0573
Page 26 of 28
Edition 03/13/2012
Supersedes edition 02/09/2010
SLTH – SEMI-FLUSH THRESHOLD LIGHT
INSTRUCTION MANUAL FOR USE, INSTALLATION AND MAINTENANCE
5.11.
MAINTENANCE PROGRAM
In order to ensure maximum light fixture life, the installed units should be subject to a
maintenance program in accordance with the following instructions and taking as
reference the Airport Service Manual ICAO - Part 9 - Airport Maintenance Practices or
FAA AC 150 5340-30.
5.11.1. DAILY OPERATIONAL CHECKS
A daily operation check should be made of the fixture. The lights should be energized and
visually inspected. If any lamps are out, the location of the fixture should be recorded and
replaced at the time when the circuit is de-energized, as described at paragraph 4.1.
5.11.2. CLEANING
Regular cleaning is necessary in order to ensure that in-pavement lighting fixtures operate
at maximum efficiency. The prism should be cleaned periodically as per paragraph 4.2.
The regularity and type of cleaning will be dictated by the weather and the location of the
fixtures.
5.11.3. SNOWPLOW OPERATIONS
Snowplow operators should exercise extra care not to strike the light fixtures with
snowplow blades. After snow 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 either
travelling at less than 10 km/h or have the blades lifted clear of the fixtures.
Recommended snow removal techniques are described in Airport Service Manual ICAO -
Part 9 - Airport Maintenance Practices or FAA AC 150/5200-30.
5.11.4. MONTHLY INSPECTIONS
This fixture is designed to exclude both ground and surface water from entering. If the
lights are not properly maintained (e.g. screws not properly tightened and O-Rings or
gaskets in bad condition) water may enter inside the fixture and create serious problems.
To prevent this from occurring, it is recommended that each fixture be inspected from the
presence of water at least once a month. More frequent inspection is desirable during and
following rainy season.
5.11.5. SCREWS TIGHTNESS
