Thales 421, Эксплуатация и обслуживание, Страница: 146 / 256

LLZ 421
Maintenance Operation and Maintenance
ILS 420
6−6
Ed. 01.10 SOAC
The floor should be washed regularly every 6 months. The detergent should be added in small
quantities only to the water; no aggressive cleaning agents should be used. Floor cleaning agents
should be avoided, since these have the same effect as a dielectric and encourage the build−up
of static charges. If the floor covering is made of a conductive material, then similarly only those
cleaning agents expressly recommended by the manufacturer of the floor covering should be
used.
The air filters of the fans, ventilation openings or air conditioners in the shelter should be checked
from time to time in accordance with the volume of dirt which accumulates at the particular location.
The filters should be replaced by new ones before they become clogged. If no new filters are avail-
able, the dirt may − as an exceptional measure − be banged out of the old filter to permit the filter
to be re−used. Damaged filters on the other hand, should not be re−used. If an air conditioner
should become iced−up, switch it off and let it defrost. Observe the manufacturers maintenance
recommendations. The separate battery compartment should be dusted out once a year. Avoid
transferring dirt from the battery compartment into the transmitter room.
− Transmitter rack
Only two types of alcohol, namely Ethyl alcohol or Glycol,or clean water should be used to remove
layers of dirt on the LCP panel. Cleaning procedure: Moisten a cloth a little with one of the liquids
mentioned above and remove dirt. Dusting of the subassemblies should only take place in con-
junction with removal of a subassembly when this becomes necessary in any case for some other
purpose. Even then, subassemblies should only be dusted if dust can be detected by means of
a visual check. They should always be dusted using a soft brush, and if possible with the aid of
a vacuum cleaner. During such operations it is essential to observe all precautionary measures
described in Section 6.1.2 for voltage−sensitive semiconductors.
− Antenna
Inspect complete antenna, monitor dipole and the equipment installation for any damage caused
by corrosion, rodents, termites, or others. Air traffic control should be informed before the antenna
will be inspected. Normally the antenna is not radiating while inspection.