Section 4 Maintenance; Introduction; Maintenance Schedule; Table 4-1 F-Range Light Fixture Maintenance - ADB F-Range L-850C Manual

F-Range Type L-850C Style 3 Inset Lights
Section 4
Maintenance

1. Introduction

2. Maintenance Schedule

Interval
Daily Check for burned-out lamp.
Check for dim lamp.
Weekly Check for dirty channel and lens.
Monthly (or more Check for moisture in the light fixture.
frequently during
rainy seasons)
Every 60 days, or Check for improper torque on
whenever the light holddown bolts.
assembly is serviced
Semi-annually Check for six inches (152 mm) of water
in the L-868 base.
After snow removal Check for damaged light fixtures.
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This section provides maintenance information and procedures for
the L-850C F-Range light fixtures.
Service life depends upon the entire assembly being waterproof. All
surfaces must be clean, dry and free of all foreign matter and all bolts
must be properly tightened if the light fixture is to operate for
extended periods without requiring maintenance.
To keep the F-Range light fixtures operating efficiently, follow a
preventive maintenance schedule. Refer to Table 4-1. Refer to FAA
AC 150/5340-26 for more detailed information.

Table 4-1 F-Range Light Fixture Maintenance

Maintenance Task
96A0285D
Issued 04/13
Action
Replace lamp and film disc cutout, if used.
Refer to Replacing Lamp in this section.
Clean optical surface if dirty. Check for
misalignment or presence of moisture in
fixture.
Clean channel and prism. Refer to Cleaning
Light Channel and Prism in this section.
Open up the light fixture. Clean, dry, and
inspect the light assembly. Replace O-ring.
Torque six bolts holding fixture to base to base
receptacle to 185  5 inch-pounds (20.902
±0.565 Nt-M). Use Loctite to keep bolts tight.
Refer to Retorquing Mounting Bolts in this
section.
Pump water from base. Remove and inspect
light for water damage. Refer to Removing L-
868 Base Water in this section.
Replace damaged fixtures. Use a power broom
for snow removal, if practical. Follow
recommended snow removal techniques
described in AC 150/5200-23.
Maintenance
Page 4-1