©1999 Navia Aviation AS 21833-3.4 Maintenance Procedures
OPERATING MANUALNORMARC 7013
INSTRUMENT LANDING SYSTEM
C-3
other equipment parameters. The normal ground check provides a system check that is
representative of the user's view.
c. Test Equipment Required.
1. A portable ILS receiver (PIR).
2. An appropriate antenna.
d. Conditions.
The facility is operating normally, and approval has been obtained from air traffic personnel to
operate on the ILS runway when required.
e. Detailed Procedure.
1. Complete a line entry on Navia Aviation Form "Localizer Monitor Reference Data" in
accordance with paragraph 5-10.
2. At the edge of course, centerline, and low clearance ground check points on each side of
the array, measure the DDM value and record data on FAA Form 6750-23.
3. Compare the data recorded with the limits established by the reference ground check.
5-13 LOCALIZER MONITOR.
a. Object.
This procedure provides a method to determine if the localizer monitor alarm points are within
the reference values established during the reference flight inspection.
b. Discussion.
1. The localizer monitor is used to ensure the integrity of the localizer system by permitting
the localizer to operate only if certain system parameters are within the limits established
during the reference flight inspection. This performance check is accomplished by adjust-
ing the transmitting equipment to cause an executive monitor alarm and then verifying that
the radiated parameters are within established reference values. If a radiated parameter is
found outside the established reference values, it must be determined if the condition is
due to monitor drift. If so, the monitor alarm points must be tightened to ensure that for
day-to-day monitor drift, the monitor will alarm whenever the radiated signal parameters
are at or beyond the established reference values.
2. The reference data must be measured carefully. CSB and SBO power can be measured at
the transmitter CSB and SBO test connectors, respectively. A dc voltage represents the
power. Typically ±0.2% variation of the normal dc voltage represents ±0.2 dB power varia-
tion.
3. The monitor DDM values are the monitor input values measured with the PIR or monitor
digital readout values. No tolerance exists for the DDM values. They are used to detect
trends such as system or monitor drift.
4. This performance check requires a line entry on Navia Aviation Form "Localizer Monitor
Reference Data". The reference data line contains the reference data used to perform a
monitor performance check. The reference data line and reference ground check can be
updated only in accordance with paragraph 5-7.
c. Test Equipment Required.
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