ADB Safegate L-858 AGSF Series, User Manual

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4.0 Maintenance
4.1 Introduction
This section provides preventive maintenance for L-858 signs.
4.2 Maintenance Schedule
To keep the L-858 taxiway and runway signs operating efficiently, follow a preventive maintenance schedule. Refer to
Table 13 .
Table 13: L-858 Taxiway and Runway Sign Maintenance
Interval Maintenance Task Action
Daily Check for burned-out lamps. Replace burned-out lamps. Check circuit
operation.
Monthly Check for dirty panels. Clean with mild soap and water.
Check for vegetation covering panel. Remove vegetation.
Semi-Annually Check for loose wire connections. Tighten wires.
Check for cracked or deteriorated wire. Replace wire.
Annually Check for paint flaking off. Repaint.
Check for panels yellowing. Clean with Formula 409 or similar cleaning
agent.
Check for deteriorated gaskets. Replace gaskets.
4.3 Troubleshooting
WARNING
Allow only qualified personnel to perform the following tasks. Observe and follow the safety instructions in this
document and all other related documentation.
Always remove input power to a sign before making any wiring connections. Failure to observe this warning may
result in personal injury, death, or equipment damage.
4.3.1 Introduction
This section provides troubleshooting information for the L-858 taxiway and runway signs. The information covers only the
most common problems. If you cannot solve the problem with the information given here, contact your local ADB Safegate
representative for help.
4.3.2 Troubleshooting Procedures
Problem – Halogen Possible Cause Corrective Action
All lamps are out or not
functioning correctly.
Loose wires or
connections
Tighten or replace wires. Check L830 for out of phase condition.
Lamp(s) burned out Replace lamp(s). Refer to Repair .
Note
If any burned-out lamp is near its maximum life, it is
recommended that you replace all lamps.
CCR circuit-shorted Check circuit. Refer to AC 150/5340-26.
96A0286, Rev. AT, 2020/09/16 29
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