AS 680/682
Description, Operation and Maintenance Maintenance and Repair
ADS−B
7−1Ed. 10.07
CHAPTER 7
MAINTENANCE, FAULT LOCATION AND REPAIR
7.1 PREVENTIVE MAINTENANCE
7.1.1 General
This chapter describes all measures of preventive maintenance to be performed during the life time
of the ADS−B Ground Station. The ADS−B Ground Station does not require any periodic calibration
and, as such, there are no items which need to be returned for adjustment. Although, there are no
periodic calibration or re−initialization procedures required, basic preventive maintenance must be
performed periodically.
The annual inspection should include, but is not limited to a general check of the condition of power
distributions, conduits, ground connections, lightning rods, RF cable connectors for corrosion or wa-
ter intrusion (if applicable). An inspection of the GPS and ADS−B RX antenna and possibly the an-
tenna ground planes for damage or pollution is recommended.
If any fault is detected refer to 7.2 Fault Location. After the fault is located corrective maintenance is
performed to replace subsystems or subassemblies. This is described in 7.3 Repair.
7.1.2 Periodic Maintenance
We recommend performing the maintenance activities listed in the table below. The used interval de-
pends on the actual environment and may be defined by the local authorities.
NOTE: During preventive maintenance, the Ground Station does not need to be switched into
a non−operational mode.
No. Daily maintenance Reference
no measures −
No. Monthly maintenance Reference
no measures −
No. Six month maintenance Reference
no measures −
No. Yearly maintenance Reference
1
2
3
Damage check, visual inspection
Cleaning of equipment surfaces
Change and/or cleaning of dust filter
7.1.4
7.1.5
7.1.5.1
No. Two−year maintenance Reference
1
2
Preventive exchange of fan tray
Verify SPU/RXU Local Oscillator frequency
7.1.6
7.1.7
No. Five−year maintenance Reference
1 Exchange of Lithium Snaphat battery (SPU/SBC) 7.1.8
7.1.3 Elimination of Static Charges
A grounding strip with a large cross−sectional area is connected between the shelter grounding ter-
minal, the equipment racks and the worktable to act as the system ground and to eliminate electro-
static charges. It is firmly connected to the table and a grounding bus on the working surface. This
system ground should not be connected to either the mains protective ground conductor or to hous-
ings and grounds of external consumers, i.e. consumers not associated with the worktable, except
at the potential equalization bus for the overall installation.
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