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11 Localiser Back Beam
11.1 Facilities designed to radiate a back beam are not permitted (1456).
12 Offset Localisers
12.1 An offset localiser may be installed as required; such an installation shall be a Category I facility (2011).
13 Field Measurements
13.1 Localiser Alignment
13.1.1 For CAT I, II and III systems, alignment measurements on centreline and as close to threshold as practicable shall be taken as soon as possible after commissioning and flight inspections on all transmitters (2012).
13.1.2 For CAT I, II and III systems, alignment measurements on centreline and as close to threshold as practicable shall be taken at monthly intervals or as agreed by ATSD in advance on all transmitters (2013).
13.1.3 Alignment measurements shall comply with the Alignment limits in ILS 02 Flight Inspection Requirements Table 1 Localiser Limits (2331).
13.1.4 For CAT III systems which provide roll out or take off guidance, measurements of course structure along the runway to ILS point E shall be made at commissioning and at 6 monthly intervals. The commissioning and one check per year should be conducted with an appropriate antenna height consistent with that of an aircraft antenna e.g. 3 to 8 m above the runway. The second check may be made at 15 m above the runway. (2211).
13.1.5 Course structure shall have a probability of 95% or better of not exceeding the limits given below, when assessed over a 40 second interval (2332).
0.5% DDM at Threshold to ILS point D increasing at a linear rate to 1% DDM at ILS point E.
NOTE: Guidance on structure assessment may be found in Attachment C to ICAO Annex 10 Volume 1.
13.2 Localiser Displacement Sensitivity
13.2.1 Displacement Sensitivity measurements shall be made on all transmitters: a) no closer than half the runway length from the localiser (2371). b) between the half and the full sector width points, providing that a proportional
relationship is established between that point and the full sector width (2372).
13.2.2 For CAT I Localisers using 14 or less radiating elements, field measurements may be made approximately 300 metres in front of the local transmitting aerial (2017).
13.2.3 Displacement Sensitivity measurements shall be taken as soon as possible after commissioning, and flight inspections (2018).
13.2.4 Displacement Sensitivity measurements shall be taken at monthly intervals or as agreed by ATSD in advance (2019).
13.2.5 Nominal displacement sensitivity for Category I localisers on runway codes 1 and 2 shall be set at ILS point B (2282). Runway codes 1 and 2 are defined in ICAO Annex 14.
13.2.6 Displacement Sensitivity measurements shall comply with the Displacement Sensitivity limits in ILS 02 Flight Inspection Requirements Table 1 Localiser Limits (2333).
13.3 Ground Measurements of Displacement Sensitivity instead of Flight Inspection
13.3.1 It is permissible to make routine ground measurement of Displacement Sensitivity instead of Flight Inspection.
13.3.2 At commissioning, the displacement sensitivity shall be measured by flight inspection (1303). If the ground and air measurements differ by more than 5% the disagreement shall be investigated (1304).
13.3.3 The flight inspection shall still include semi-orbits from which linearity in the course sectors can be examined (1305).
13.3.4 All airports wishing to use the ground measurements as standard shall submit the following information to the CAA:
a) Position of the ground measurement points (1306); and b) Details of the equipment to be used for this measurement (1307).
13.3.5 The localiser displacement sensitivity shall be measured at a time as near as possible to that of the flight inspection (1308). The result of the measurement is needed by the flight inspection organisation as part of the structure measurement calculations.
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CAP 670 Air Traffic Services Safety Requirements 2(45)
