L-852A-D, J & K ITCF, F-Range, ICAO LED Taxiway Centerline Light
96A0460 Rev. C
Maintenance
© ADB Airfield Solutions All Rights Reserved
18
2.4 Maintenance
This section provides maintenance instructions for the L852 ITCF LED Light Fixtures
2.4.1 L852 A-D ITCF
Maintenance
Table 2:
Maintenance Schedule
2.4.1.1 Cleaning the Light
Channel and Prism
To clean the light channel and prism, perform the following procedure:
1. Use a suitable fiber brush to remove all accumulated debris from the light channel.
2. Clean the outer surface of the prism using liquid glass cleaner. If the prism is coated with a
substance impervious to the cleaner, apply a suitable solvent sparingly with a wad of
cotton or a patch of cloth. After the solvent has acted, remove the softened coating with a
clean piece of cotton or cloth. Dry the prism gently using, dry, oil-free compressed air at a
pressure no greater than 10 psi (69 KN/m2) to evaporate or remove all remaining cleaner.
2.4.1.2 Retorquing Mounting
Bolts
When retorquing mounting bolts, torque according to guidance given in “Installation on L-868
Base” on page 16.
2.4.1.3 Lifting Optical Unit Out
of Base
To lift the optical unit from the light base, perform the following procedure:
1. Remove the six fixing screws and washers or self locking nuts.
2. Fit the appropriate lifting tool into both threaded holes located (180 degrees apart) in the
cover, lift the optical unit out of the base and place the optical unit next to the base.
3. Disconnect the light fixture wires from the power wires coming from the transformer(s).
4. Mount a serviced or new light fixture as described in Installation on L-868 Base in the
Installation section.
NOTE:
Torque the six screws torque according to guidance given in “Installation on L-868
5. Take the replaced in-pavement fixture unit back to the maintenance shop where it can be
serviced fully.
NOTE:
Never hold the light fixture by the wires. This may damage the insulation, break
the waterproof seal, and cause insulation faults and water leakage.
WARNING
Read the instructions in their entirety before starting installation.
Reference “Mechanical
Requirements” on page 9 and
“Electrical Requirements” on
page 11 for the
recomendations when
installing or reparing of inset
lights.
Interval
Maintenance Task
Action
Weekly
Check for dirty channel and
lens.
Clean channel and prism. Refer to
Cleaning
Light Channel and Prism
in this section.
Monthly (or more
frequently during
rainy seasons)
Check for moisture in the light
fixture.
Open up the light fixture. Clean, dry, and inspect
the light assembly. Replace O-ring.
Every 60 days, or
whenever the light
assembly is
serviced
Check for improper torque on
holddown bolts.
Torque six bolts holding fixture to base
receptacle to 185
±
5 inch-pounds (20.902
±0.565 N•m). Use Loctite to keep bolts tight.
Refer to
Retorquing Mounting Bolts
in this
section.
After snow removal
Check for damaged light
fixtures.
Replace damaged fixtures. Use a power broom
for snow removal, if practical. Follow
recommended snow removal techniques
described in AC 150/5200-30 (current edition).
