Document UT-MT-0428
Page 26 of 35
Edition 11/03/2014
Supersedes edition 04/30/2012
INSET RUNWAY EDGE LIGHT SLRE
INSTRUCTION MANUAL FOR USE, INSTALLATION AND MAINTENANCE
4.1.2
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.
4.2
REMOVING AND OPENING THE LIGHT UNIT FROM THE BASE
4.2.1
Removing the fixture
Remove the fixture from the base, after switching off, by unscrewing the six
locking screws complete with washers.
Raise the fixture by using the two lifting tools (P/N 332.4140 or 332.4230) inserted
in the suitable slots provided on the dome. As an alternative, two screwdrivers can
be used.
Disconnect the fixture plug/s and grounding cable from those inside the shallow
base.
4.2.2
Opening the fixture
Unscrew the leak valve cap and push the valve central pin, in this way the light
internal pressure is the same of the atmospheric pressure.
Open the fixture by unscrewing the three locking screws HSCH M5x16 (Figure 1 -
n°22).
Every time the fixture is opened, inspect the following parts and replace them if
necessary:
prism, if it is dirty or damaged
prism gasket, check the integrity
cable lead with plug
4.2.3
Closing the fixture
Every time the fixture is opened replace the following items with a new ones:
three locking screws HSCH M5x16 (Figure 1 - n°22);
O-Rings between dome and lower cover (Figure 1 – n°20).
