DOCUMENT 2421
REV. L
Instruction Manual
ICAO Approach Fixture
10
8
Maintenance
The preferred method of maintaining these lights is to periodically and systematically replace
the units and return it to the maintenance shop for renovation. As an alternative, the units can
be serviced in the field. However, it is recommended that field servicing be limited to
cleaning the lens only as described in section 8.1.
8.1
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 seal. A gentle air blast may be used.
8.2
Relamping
Remove and secure power to the fixture.
Turn the fixture upside down and remove the six
screws holding the inner cover to the light housing. Disconnect the lamp leads. Inspect the feed-
thru terminal for signs of corrosion. Replace feed-thru assemblies per paragraph 8.5. Install the
new lamps by reversing the procedure above
making sure that the Teflon tubing
completely covers the lamp terminals.
Inspect/replace the optical housing’s o-ring per
paragraph 8.3. Assemble the inner cover onto the light housing. Tighten the mounting screws
to 30 in-lbs. Secure the light fixture to the base per section 7.
8.3
O-Ring Replacement
Every time the unit is opened, the o-ring must be closely examined and replaced, if necessary.
Any o-ring that is stretched, torn, has permanent set, or some other defect, which would prevent
it from forming a watertight seal, must be replaced with a new o-ring.
NOTICE
NOTICE:
Warranty is void if other than Crouse-Hinds ALP parts are used to
relamp or rebuild the fixture.
NOTICE
NOTICE:
The lamp is hot when fixture is energized and remains hot for a
short time after fixture is turned off.
