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at reducing the hazard to aircraft to a minimum are contained in Annex 14, Chapter 8.
3.1 Specification for ILS
3.1.1 Definitions
Angular displacement sensitivity. The ratio of measured DDM to the corresponding angular displacement from the
appropriate reference line.
Back course sector. The course sector which is situated on the opposite side of the localizer from the runway.
Course line. The locus of points nearest to the runway centre line in any horizontal plane at which the DDM is zero.
Course sector. A sector in a horizontal plane containing the course line and limited by the loci of points nearest to the course
line at which the DDM is 0.155.
DDM — Difference in depth of modulation. The percentage modulation depth of the larger signal minus the percentage
modulation depth of the smaller signal, divided by 100.
Displacement sensitivity (localizer). The ratio of measured DDM to the corresponding lateral displacement from the
appropriate reference line.
Facility Performance Category I — ILS. An ILS which provides guidance information from the coverage limit of the ILS to
the point at which the localizer course line intersects the ILS glide path at a height of 60 m (200 ft) or less above the
horizontal plane containing the threshold.
Note.— This definition is not intended to preclude the use of Facility Performance Category I — ILS below the
height of 60 m (200 ft), with visual reference where the quality of the guidance provided permits, and where satisfactory
operational procedures have been established.
Facility Performance Category II — ILS. An ILS which provides guidance information from the coverage limit of the ILS
to the point at which the localizer course line intersects the ILS glide path at a height of 15 m (50 ft) or less above the
horizontal plane containing the threshold.
Facility Performance Category III — ILS. An ILS which, with the aid of ancillary equipment where necessary, provides
guidance information from the coverage limit of the facility to, and along, the surface of the runway.
Front course sector. The course sector which is situated on the same side of the localizer as the runway.
Half course sector. The sector, in a horizontal plane containing the course line and limited by the loci of points nearest to the
course line at which the DDM is 0.0775.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-2
Half ILS glide path sector. The sector in the vertical plane containing the ILS glide path and limited by the loci of points
nearest to the glide path at which the DDM is 0.0875.
ILS continuity of service. That quality which relates to the rarity of radiated signal interruptions. The level of continuity of
service of the localizer or the glide path is expressed in terms of the probability of not losing the radiated guidance
signals.
ILS glide path. That locus of points in the vertical plane containing the runway centre line at which the DDM is zero, which,
of all such loci, is the closest to the horizontal plane.
ILS glide path angle. The angle between a straight line which represents the mean of the ILS glide path and the horizontal.
ILS glide path sector. The sector in the vertical plane containing the ILS glide path and limited by the loci of points nearest
to the glide path at which the DDM is 0.175.
Note.— The ILS glide path sector is located in the vertical plane containing the runway centre line, and is divided
by the radiated glide path in two parts called upper sector and lower sector, referring respectively to the sectors above
and below the glide path.
ILS integrity. That quality which relates to the trust which can be placed in the correctness of the information supplied by the
facility. The level of integrity of the localizer or the glide path is expressed in terms of the probability of not radiating
false guidance signals.
ILS Point “A”. A point on the ILS glide path measured along the extended runway centre line in the approach direction a
distance of 7.5 km (4 NM) from the threshold.
ILS Point “B”. A point on the ILS glide path measured along the extended runway centre line in the approach direction a
distance of 1 050 m (3 500 ft) from the threshold.
ILS Point “C”. A point through which the downward extended straight portion of the nominal ILS glide path passes at a
height of 30 m (100 ft) above the horizontal plane containing the threshold.
ILS Point “D”. A point 4 m (12 ft) above the runway centre line and 900 m (3 000 ft) from the threshold in the direction of
the localizer.
ILS Point “E”. A point 4 m (12 ft) above the runway centre line and 600 m (2 000 ft) from the stop end of the runway in the
direction of the threshold.
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