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3.11.5.2.3 Monitor and control
3.11.5.2.3.1 The approach azimuth and back azimuth monitor systems shall cause the radiation of their respective
functions to cease and a warning shall be provided at the designated control points if any of the following conditions persist
for longer than the periods specified:
a) there is a change in the ground equipment contribution to the mean course error such that the PFE at the approach
reference datum or in the direction of any azimuth radial exceeds the limits specified in 3.11.4.9.4 and 3.11.4.9.5
and (for simplified MLS configuration) in 3.11.3.4 for a period of more than one second or (for simplified MLS
configuration) for a period of more than six seconds;
b) there is a reduction in the radiated power to less than that necessary to satisfy the requirements specified in
3.11.4.10.1 and 3.11.4.6.2.5.2 for a period of more than one second;
c) there is an error in the preamble DPSK transmissions which occurs more than once in any one-second period;
d) there is an error in the TDM synchronization of a particular azimuth function such that the requirement specified in
3.11.4.3.2 is not satisfied, and this condition persists for more than one second.
Note.— Guidance material is provided in Attachment G, 6.
3.11.5.2.3.2 Design and operation of the monitor system shall cause radiation to cease and a warning shall be provided
at the designated control points in the event of failure of the monitor system itself.
3.11.5.2.3.3 The period during which erroneous guidance information is radiated, including period(s) of zero radiation,
shall not exceed the periods specified in 3.11.5.2.3.1. Attempts to clear a fault by resetting the primary ground equipment or
by switching to standby ground equipment shall be completed within this time. If the fault is not cleared within the time
allowed, the radiation shall cease. After shutdown, no attempt shall be made to restore service until a period of 20 seconds
has elapsed.
3.11.5.2.4 Integrity and continuity of service requirements for MLS azimuth
3.11.5.2.4.1 The probability of not radiating false guidance signals shall not be less than 1 – 0.5 × 10–9 in any one
landing for an MLS azimuth intended to be used for Categories II and III operations.
3.11.5.2.4.2 Recommendation.— The probability of not radiating false guidance signals should not be less than
1 – 1.0 × 10–7 in any one landing for an MLS azimuth intended to be used for Category I operations.
Chapter 3 Annex 10 — Aeronautical Communications
3-93 23/11/06
3.11.5.2.4.3 The probability of not losing the radiated guidance signal shall be greater than:
a) 1 – 2 × 10–6 in any period of 15 seconds for an MLS azimuth intended to be used for Category II or Category IIIA
operations (equivalent to 2 000 hours mean time between outages); and
b) 1 – 2 × 10–6 in any period of 30 seconds for an MLS azimuth intended to be used for the full range of Category III
operations (equivalent to 4 000 hours mean time between outages).
3.11.5.2.4.4 Recommendation.— The probability of not losing the radiated guidance signal should exceed 1 – 4 × 10–6
in any period of 15 seconds for an MLS azimuth intended to be used for Category I operations (equivalent to 1 000 hours mean
time between outages).
Note.— Guidance material on integrity and continuity of service is given in Attachment G, 11.
3.11.5.2.5 Ground equipment accuracy
3.11.5.2.5.1 The ground equipment contribution to the mean course error shall not exceed an error equivalent to plus or
minus 3 m (10 ft) at the MLS approach reference datum.
3.11.5.2.5.2 Recommendation.— The ground equipment contribution to the CMN at the reference datum should not
exceed 1 m (3.3 ft) or 0.03 degree, whichever is less, on a 95 per cent probability basis.
Note 1.— This is the equipment error, and does not include any propagation effects.
Note 2.— Guidance on the measurement of this parameter can be found in Attachment G, 2.5.2.
3.11.5.2.6 Siting
Note 1.— It is not intended to restrict the installation of MLS when it is not possible to site the azimuth ground
equipment on the extension of the runway centre line.
Note 2.— Guidance material on critical and sensitive areas for azimuth antennas is provided in Attachment G, 4.2.
3.11.5.2.6.1 Normally, the approach azimuth ground equipment antenna shall be located on the extension of the
runway centre line beyond the stop end and shall be adjusted so that the vertical plane containing the zero degree course line
will contain the MLS approach reference datum. Siting of the antenna shall be consistent with safe obstacle clearance SARPs
in Annex 14.
　
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