Document UT-MT-0778_EN
Page 28 of 39
Edition 11/03/2014
Supersedes edition 02/03/2014
LED INSET THRESHOLD/END LIGHT L
THE04
INSTRUCTION MANUAL FOR USE, INSTALLATION AND MAINTENANCE
3.5.2
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.
3.6
REMOVING AND OPENING THE LIGHT UNIT FROM THE BASE
3.6.1
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.
3.6.2
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 six locking screws HSFH M5x10 (Figure 16 - n°1).
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
3.6.3
Closing the fixture
Every time the fixture is opened
replace
the following items with a new ones:
six locking screws HSFH M5x10 (Figure 16 - n°1);
O-Rings between dome and lower cover (Figure 18 – n°2 and 3);
Verify the correct position of the two O-Ring between dome and lower cover (Figure
18 – n°2 and 3); mount the lower cover on the dome and fasten it by means the six
screws HSFH M5x10 (Figure 16 - n°1). One drop of anaerobic adhesive lower type
(e.g. LOXEAL 24-18) should be applied to the screws before installation; tightening
torque is 2.5 Nm.
