7.1.3 Marker Beacon Field strength (relative) 2dB (2129) Distance 10 metres (2130)
7.1.4 Associated DME Field strength (relative) 2dB (2131) Distance 60 metres at threshold and point A (2132)
7.2 Uncertainty of Position Marking of Flight Inspection Data
7.2.1 Approach Toward a Facility
±0.1 NM for markings at each nautical mile (2133).
±0.1 NM for marking at ILS point A (2134).
±0.05 NM for marking at ILS point B (2135).
±0.1° for marking glidepath slice at 1.75 x (glidepath angle) (2136).
±20 metres for marking the threshold crossing (2137).
7.2.2 Orbital Flights (1565) ±1.5 Degree. NOTE: A marking accuracy of ±1.5° applies to clearance and coverage inspection, it is not sufficient for measuring displacement sensitivity.
13 Records and Graphs
Where chart recordings are used for parameter evaluation, they shall have sufficient resolution for this purpose (1566). The minimum requirements are given below.
13.1 Structure Stability Recordings (deviation current) (1567)
13.1.1 Localiser Minimum sensitivity of 1 mm per μA.
13.1.2 Glidepath Minimum sensitivity of 0.5 mm per μA.
13.2 Structure Measurements (corrected recordings)
13.2.1 Localiser (1568) Minimum sensitivity of 1mm per μA.
13.2.2 Glidepath
Minimum sensitivity of 0.5mm per μA for the initial part of the recording. For Category II & III systems, it must be possible to show the signal characteristic down to threshold crossing (1569). This may require reduced sensitivity depending on available chart width.
13.3 Other Measurements
Many other recordings will need sensitivity changes during the recording to obtain optimum resolution at all times. The chart produced must be capable of displaying at least 450 μA of deflection current without saturation. Sufficient different sensitivities of display must be available to allow signal characteristics to be measured accurately (1570).
13.4 Position Annotation
Records and graphs must be annotated to show the position of the aircraft at the time of making the measurement (1571). The minimum requirements are given below. Required accuracies of annotation are given in paragraph 7.2.
13.4.1 Approaches Towards a Facility
Every nautical mile (referenced to 0 NM at the threshold), ILS points A, B & C, Threshold.
13.4.2 Glidepath Level Flight (on localiser centreline) Every nautical mile (referenced to 0 NM at the threshold), and 1.752 (2138).
13.4.3 Orbital Flights (1573) Every 5 degrees.
Annex 2 - Microwave Landing System
6 Equipment
6.1 Receiver
6.1.1 The receiver used for MLS flight inspection shall: a) have independent Azimuth and Elevation flag outputs (1578); and b) be capable of operating with the transmitter basic data word *2 set to 'on test’
(1579).
6.1.2 The equipment shall be capable of measuring and recording the relative signal levels of each component (scanning beam, clearance, multipath, OCI, preamble) within a function (1582).
NOTE: This measurement may be made by examining the receiver output or by the use of separate measuring equipment such as a spectrum analyser.
6.2 Measurement and Recording Equipment
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