ICASC_Paper_on_Flight_inspection_Intervals_IFIS_template_issue_1doc.doc

1156 ground maintenance activity and its frequency is

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1.15.6 Ground maintenance activity and its frequency is dependent upon the design, reliability and stability of a particular equipment and the quality of the test equipment employed as a transfer standard. It has been shown that equipment reliability may be adversely affected by frequently scheduled major maintenance activity. It is, therefore, desirable to limit such activity to essential testing only, particularly for tests that require the disconnection of cables. There is a requirement for additional supplementary flight inspection when some engineering activities, such as glide path antenna changes or adjustments are made. Further investigation may be initiated if the independent monitor calibration indicates any adjustments are required. 1.15.7 The correlation of air and ground measurement records and historic demonstration of equipment stability have allowed some States to extend the intervals between flight inspections. This is supported by the use of routine monitor readings, strict environmental safeguarding and closer tolerances on flight inspection results to ensure operational stability is maintained. Example criteria for the extension of ILS flight inspection intervals are given in 1.15.8 and 1.15.9. Example of criteria for the extension of ILS flight inspection intervals 1.15.8 This section gives an example of criteria applied to extend the nominal interval between flight inspections on selected ILS facilities. The procedure requires: a) an initial demonstration of stability over four consecutive periodic flight inspections with no transmitter adjustments. The tolerance applied to inspection results for glide path angle and displacement sensitivity, localizer alignment and displacement sensitivity is 75 per cent of the normal acceptance standards. Glide path clearance below the path at 0.3 of the nominal glide path angle should be greater than 220 μA; b) good correlation between concurrent ground and airborne results; c) a record of independent monitor calibration results; d) a record of equipment monitor readings taken at least at monthly intervals; e) evidence that the quality of the maintenance is high; and f) that the facility is adequately safeguarded against changes in the operational environment, e.g. building development. 1.15.9 The nominal inspection interval should be resumed if these criteria are no longer met. Correlation as the basis for extending periodicity
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1.15.10 A typical basis for extending the interval between required measurements without degrading ILS integrity is correlation. Any individual measurement is normally expected to be repeatable over time without adjustments to the equipment. Correlation between ILS measurements made both on the ground and in the air at the same or nearly the same time is also expected. This places equal responsibility on ground and airborne personnel and helps identify common-mode measurement errors. An additional requirement to extend flight inspection intervals is the influence of near- and far-field environments on the signals. These
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