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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.
3.11.5.3.3.2 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.
3.11.5.3.3.3 The period during which erroneous guidance information is radiated, including period(s) of zero radiation,
shall not exceed the periods specified in 3.11.5.3.3.1. 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, radiation shall cease. After shutdown, no attempt shall be made to restore service until a period of 20 seconds has
elapsed.
3.11.5.3.4 Integrity and continuity of service requirements for MLS approach elevation
3.11.5.3.4.1 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 approach elevation intended to be used for Categories II and III operations.
3.11.5.3.4.2 Recommendation.— The probability of not radiating false guidance signals should not be less than
1 – 1.0 × 10–7 in any one landing on MLS approach elevation intended to be used for Category I operations.
3.11.5.3.4.3 The probability of not losing the radiated guidance signal shall be greater than 1 – 2 × 10–6 in any period of
15 seconds for an MLS approach elevation intended to be used for Categories II and III operations (equivalent to 2 000 hours
mean time between outages).
3.11.5.3.4.4 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 approach elevation 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.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-96
3.11.5.3.5 Ground equipment accuracy
3.11.5.3.5.1 The ground equipment contribution to the mean glide path error component of the PFE shall not exceed an
error equivalent to plus or minus 0.3 m (1 ft) at the approach reference datum.
3.11.5.3.5.2 Recommendation.— The ground equipment contribution to the CMN at the reference datum should not
exceed 0.15 m (0.5 ft) 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.
3.11.5.3.6 Siting
Note.— Guidance material on critical areas for elevation antennas is provided in Attachment G, 4.2.
3.11.5.3.6.1 The approach elevation ground equipment antenna shall be located beside the runway. Siting of the
antennas shall be consistent with obstacle clearance Standards and Recommended Practices in Annex 14.
3.11.5.3.6.2 The approach elevation ground equipment antenna shall be sited so that the asymptote of the minimum
glide path crosses the threshold at the MLS approach reference datum.
3.11.5.3.6.2.1 Recommendation.— The minimum glide path angle is normally 3 degrees and should not exceed
3 degrees except where alternative means of satisfying obstacle clearance requirements are impractical.
Note.— It is intended that the choice of a minimum glide path angle higher than 3 degrees be determined by operational
rather than technical factors.
3.11.5.3.6.2.2 Recommendation.— The approach elevation ground equipment antenna should be sited so that the
height of the point which corresponds to the decoded guidance signal of the minimum glide path above the threshold does not
exceed 18 m (60 ft).
Note.— The offset of the elevation antenna from the runway centre line will cause the minimum glide path elevation
guidance to be above the approach reference datum.
3.11.5.3.6.3 Recommendation.— When ILS and MLS simultaneously serve the same runway, the ILS reference datum
and the MLS approach reference datum should coincide within a tolerance of 1 m (3 ft).
Note 1.— It is intended that this recommendation would apply only if the ILS reference datum satisfies the height
specifications in 3.1.5.1.4 and 3.1.5.1.5.
Note 2.— Information related to collocated MLS/ILS siting is provided in Attachment G, 4.1.
3.11.5.4 Data coverage and monitoring
Note 1.— Guidance material relating to data applications is provided in Attachment G, 2.7.
Note 2.— The essential data are basic data and essential auxiliary data transmitted in auxiliary data words A1, A2, A3
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