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23/11/06 ATT G-42
Attachment G Annex 10 — Aeronautical Communications
14.2.2 When conducted to a parallel secondary runway these operations require the airborne system to compute both
lateral and vertical guidance. Decision heights may be limited by the MLS signal coverage and computed guidance accuracy
achievable.
14.2.3 MLS ground equipment meeting Level 2 service objectives may be sufficient for computed centre line
operations when:
a) the operation is conducted to Category I decision heights or higher; and
b) reference path construction and computed lateral and vertical guidance by the airborne equipment meets the same
level of integrity as the MLS receiver for a basic MLS operation.
14.2.4 When computed centre line operations are conducted below Category I decision heights, the service level of the
MLS ground equipment must be commensurate with the decision height used. Identically the airborne equipment providing
computed guidance must have the same integrity as the basic receiver would have to conduct MLS basic operations to an
equivalent decision height.
14.3 MLS curved path procedures
14.3.1 These procedures must be examined carefully to determine the level of service needed for the ground equipment.
With MLS curved path operations the most stringent requirement for integrity and continuity of service may be based on a
portion of the flight path prior to decision height. In these situations, the integrity and continuity of service objectives of the
MLS ground equipment cannot be predicated solely on the category of the landing. For operations where the obstacle
clearance requirements place a high degree of reliance on guidance accuracy, the ground equipment integrity and continuity
of service objectives can be determined using the risk tree method described in Attachment A. The following requirements
must also be considered:
a) airborne equipment must have the capability of reference path construction and computed vertical and lateral
guidance with positive control in the turns; and
b) airborne integrity and continuity of service must be consistent with the degree of reliance on the guidance accuracy
necessary to safely execute the procedure.
15. Application of simplified MLS configurations
15.1 While SARPs for basic and expanded MLS configurations state a single signal-in-space standard, a simplified
MLS configuration is defined in Chapter 3, 3.11.3.4 to permit the use of MLS in support of RNP-based approach and
departure operations (Chapter 2, 2.1.6).
15.2 Relaxed coverage, accuracy, and monitor limits do not exceed those specified in Chapter 3, 3.1 for a Facility
Performance Category I ILS. Such a simplified MLS configuration is capable of supporting Category I operations with
significant reductions in size of azimuth and elevation antennas. Further reductions in equipment complexity can be achieved
as the CMN requirement is waived for applications in support of approach and landing operations which do not require
autopilot coupling.
15.3 The simplified MLS is compatible with the basic and expanded MLS configurations.
ATT G-43 23/11/06
Annex 10 — Aeronautical Communications Volume I
23/11/06 ATT G-44 Table G-1. System power budget
(±40° azimuth coverage; 0–20° vertical coverage; 37 km (20 NM) range)
Approach azimuth function Elevation function Back azimuth function
Power budget items Angle BW Angle BW Angle BW
(Note 1) DPSK Clearance 1° 2° 3° (Note 2) DPSK 1° 2° DPSK 1° 2° 3°
Signal required at aircraft (dBm) –95.0 –93.5 –91.2 –85.2 –81.7 –95.0 –93.5 –90.0 –95.0 –93.5 –88.2 –84.7
Propagation loss (dB) (Notes 3, 4) 139.0 139.0 139.0 139.0 139.0 138.1 138.1 138.1 133.9 133.9 133.9 133.9
Probabilistic losses (dB):
a) Polarization 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
b) Rain 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 1.3 1.3 1.3 1.3
c) Atmospheric 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
d) Horizontal multipath 3.0 3.0 0.5 0.5 0.5 3.0 – – 3.0 0.5 0.5 0.5
e) Vertical multipath 2.0 2.0 2.0 2.0 2.0 2.0 1.0 1.0 2.0 2.0 2.0 2.0
Root – sum – square (RSS)
total a) through e) (dB)
4.3
4.3
3.1
3.1 3.1
4.3
2.5
2.5
3.9
2.5
2.5
2.5
Horizontal and vertical pattern loss (dB) – 1.0 2.0 2.0 2.0 – 6.0 6.0 – 2.0 2.0 2.0
Monitor margin (dB) 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5
Antenna gain (dB) (Note 5) – –13.3 –23.0 –20.0 –18.0 – –20.8 –17.8 – –23.0 –20.0 –18.0
Net power gain at coverage extremes (dB) –7.3 – – – – –7.3 – – –7.3 – – –
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