DOCUMENT 1218
REV. B
Instruction Manual
AGS-LED
312 LED Series
300mm and 400mm
11
10
Maintenance and Troubleshooting
Maintenance on the Crouse-Hinds Aircraft Guidance Sign includes external bolt/nut torque
checks, sign face cleaning, and (less commonly) leg replacement after frangible events. For any
maintenance or troubleshooting operations that requires the removal of the electrical box cover,
removal of a sign frame section, or disconnection from your guidance sign power circuit, be sure
to
LOCKOUT
and
DE-ENERGIZE
your power circuit before entering the sign. If it is
necessary to open the electronics enclosure, during these operations, it is imperative that the
enclosure be properly closed at the completion of the operation.
WARNING:
WARNING
Failure to fully fasten the electronics enclosure lid may result in water
leaking into the electronics enclosure. Water accumulation in the
enclosure may lead to permanent failure of the power supply and
subsequent failure of the sign.
10.1 Torque Checks & Re-torque
It is recommended to check the torque of, and re-torque if necessary, all installation bolts once
every 60 days. Sign body bolts can also be checked for torque at this time. Recommended torque
values are also listed in
Table 18, pg 91
.
10.2 Sign Face Cleaning
The sign face exterior can be cleaned with water, isopropyl alcohol, or a mixture of
water/isopropyl. It is not recommended to use any other cleaning agents.
10.3 Frangible Event Maintenance
After a frangible event, the sign legs, and power coupling for signs with external power cords,
will be broken just above their mounting bases. Before touching the sign
LOCKOUT
and
DE-
ENERGIZE
your power circuit. The power cord is designed, but not guaranteed, to disconnect
during a frangible event.
