OPERATING MANUAL
C-18
21833-3.4
NORMARC 7013
INSTRUMENT LANDING SYSTEM
Maintenance Procedures ©1999 Navia Aviation AS
itor performance check. The reference data line can only be updated in accordance with
paragraph 5-7.
c. Test Equipment Required.
1. A portable ILS receiver (PIR).
2. BITE/MDT
3. BIRD wattmeter
4. A dvm.
5. The FA-9438 modulation meter or equivalent.
d. Conditions.
A facility shutdown is required for this check.
e. Detailed Procedure.
1. Preliminary actions.
(a) Refer to Navia Aviation Form “CEGS Monitor Reference Data” for the reference values
specified during the monitor performance check.
(b) Verify that modulation is 40 percent for each tone. (PIR connected to CSB COU test con-
nector on facility front). The facility must be properly phased.
(c) Set up the PIR or equivalent to measure DDM in the carrier feedline and ensure that mod-
ulation equality (0 DDM) exists.
(d) Bypass the equipment monitor(s).
2. Width alarms.
(a) Connect the dvm to the transmitter SBO test connector.. This voltage represents the nomi-
nal transmitter SBO power in front of the SBO step attenuator. Measure the dc voltage, note
the transmitter SBO attenuator value and record in Table “CEGS Monitor Reference Data”.
Compare the values to the reference values. If found outside the tolerance ivestigation should
be carried out.
(b) Decrease the sideband power (increase the SBO attenuator value) until the monitor is in
alarm. Confirm that this attenuator value is not greater than the flight checked reference value.
Record this SBO attenuator value. If the alarm value has been exceeded, corrective action
should be taken.
(c) Measure and record the width monitor DDM on Navia Aviation Form "CEGS Monitor Ref-
erence Data". The width DDM is availible in the PMDT Monitor 1 window. Note that no toler-
ance exists on this entry. It is used to detect trends.
(d) Increase the sideband power (decrease the SBO attenuator value) until the monitor is in
alarm. Confirm that this attenuator value is not less than the flight checked reference value.
Record this SBO attenuator value. If the alarm value has been exceeded, corrective action
should be taken.
(e) Measure and record the width monitor DDM on Navia Aviation Form “CEGS Monitor Refer-
ence Data”. The width DDM is availible in the PMDT Monitor 1 window. Note that no tolerance
exists on this entry. It is used to detect trends.
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