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the ILS. The facility should be sited on the localizer course at a suitable distance from the threshold to provide for optimum
transition.
23/11/06 ATT C-38
Attachment C Annex 10 — Aeronautical Communications
2.13 The use of Facility Performance
Category I — ILS for automatic approaches and landings in visibility conditions
permitting visual monitoring of the operation by the pilot
2.13.1 Facility Performance Category I — ILS installations of suitable quality can be used, in combination with aircraft
flight control systems of types not relying solely on the guidance information derived from the ILS sensors, for automatic
approaches and automatic landings in visibility conditions permitting visual monitoring of the operation by the pilot.
2.13.2 To assist aircraft operating agencies with the initial appraisal of the suitability of individual ILS installations for
such operations, provider States are encouraged to promulgate:
a) the differences in any respect from Chapter 3, 3.1;
b) the extent of compliance with the provisions in Chapter 3, 3.1.3.4 and 3.1.5.4, regarding localizer and glide path
beam structure; and
c) the height of the ILS reference datum above the threshold.
2.13.3 To avoid interference which might prevent the completion of an automatic approach and landing, it is necessary
that local arrangements be made to protect, to the extent practicable, the ILS critical and sensitive areas.
2.13.4 Where two separate ILS facilities serve opposite ends of a single runway, an interlock should ensure that only
the localizer serving the approach direction in use should radiate.
2.14 ILS classification — supplementary ILS description method with objective
to facilitate operational utilization
2.14.1 The classification system given below, in conjunction with the current facility performance categories, is
intended to provide a more comprehensive method of describing an ILS.
2.14.2 The ILS classification is defined by using three characters as follows:
a) I, II or III: this character indicates conformance to Facility Performance Category in Chapter 3, 3.1.3 and 3.1.5.
b) A, B, C, T, D or E: this character defines the ILS points to which the localizer structure conforms to the course
structure given at Chapter 3, 3.1.3.4.2, except the letter T, which designates the runway threshold. The points are
defined in Chapter 3, 3.1.1.
c) 1, 2, 3 or 4: this number indicates the level of integrity and continuity of service given in Table C-2.
Note.— In relation to specific ILS operations it is intended that the level of integrity and continuity of service would
typically be associated as follows:
1) Level 2 is the performance objective for ILS equipment used to support low visibility operations when ILS guidance
for position information in the landing phase is supplemented by visual cues. This level is a recommended objective
for equipment supporting Category I operations;
2) Level 3 is the performance objective for ILS equipment used to support operations which place a high degree of
reliance on ILS guidance for positioning through touchdown. This level is a required objective for equipment
supporting Category II and IIIA operations; and
ATT C-39 23/11/06
Annex 10 — Aeronautical Communications Volume I
Table C-2. Integrity and continuity of service objectives
Localizer or glide path
Level Integrity Continuity of service MTBO (hours)
1 Not demonstrated,
or less than required
for Level 2
2 1 – 10–7 in any
one landing
1 – 4 × 10–6 in any
period of 15 seconds
1 000
3 1 – 0.5 × 10–9 in any
one landing
1 – 2 × 10–6 in any
period of 15 seconds
2 000
4 1 – 0.5 × 10–9 in any
one landing
1 – 2 × 10–6 in any
period of
30 seconds (localizer)
15 seconds (glide path)
4 000 (localizer)
2 000 (glide path)
Note.— For currently installed systems, in the event that the Level 2 integrity value is not available or cannot be
readily calculated, it is necessary to at least perform a detailed analysis of the integrity to assure proper monitor fail-safe
operation.
3) Level 4 is the performance objective for ILS equipment used to support operations which place a high degree of
reliance on ILS guidance throughout touchdown and rollout. This level basically relates to the needs of the full
range of Category III operations.
2.14.3 As an example, a Facility Performance Category II — ILS which meets the localizer course structure criteria
appropriate to a Facility Performance Category III — ILS down to ILS point “D” and conforms to the integrity and continuity of
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