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accessibility;
f) identify and resolve operational and technical feasibility issues for GNSS with ground-based augmentation system
(GBAS) to support Category II and III operations. Implement GNSS for Category II and III operations where
operationally required and economically beneficial; and
g) enable each region to develop an implementation strategy for these systems in line with the global strategy.
___________________
ATT B-3 23/11/06
ATTACHMENT C. INFORMATION AND MATERIAL FOR
GUIDANCE IN THE APPLICATION OF THE STANDARDS AND
RECOMMENDED PRACTICES FOR ILS, VOR, PAR, 75 MHz
MARKER BEACONS (EN-ROUTE), NDB AND DME
1. Introduction
The material in this Attachment is intended for guidance and clarification purposes and is not to be considered as part of the
specifications or as part of the Standards and Recommended Practices contained in Volume I.
For the clarity of understanding of the text that follows and to facilitate the ready exchange of thoughts on closely
associated concepts, the following definitions are included.
Definitions relating to the Instrument Landing System (ILS)
Note.— The terms given here are in most cases capable of use either without prefix or in association with the prefixes
“nominal” and “indicated”. Such usages are intended to convey the following meanings:
The prefix “nominal”: the design characteristics of an element or concept.
No prefix: the achieved characteristics of an element or concept.
The prefix “indicated”: the achieved characteristics of an element or concept, as indicated on a receiver (i.e. including
the errors of the receiving installation).
Localizer system ILS glide path system
Slant course line. The line formed at the intersection of the course surface and the plane of the nominal ILS glide path.
False ILS glide path. Those loci of points in the vertical
plane containing the runway centre line at which the
DDM is zero, other than that locus of points
forming the ILS glide path.
Displacement error. The angular or linear displacement of any point of zero DDM with respect to the nominal course line or
the nominal ILS glide path respectively.
Linearity sector. A sector containing the course line or ILS glide path, within a course sector or an ILS glide path sector,
respectively, in which the increment of DDM per unit of displacement remains substantially constant.
Low DDM zone. A zone outside a course sector or an ILS glide path sector in which the DDM is less than the minimum
value specified for the zone.
Note.— The minimum values of DDM related to such zones are specified in Chapter 3, 3.1.3.7 and 3.1.5.6.
Plane of the nominal ILS glide path. A plane perpendicular to the vertical plane of the runway centre line extended and
containing the nominal ILS glide path.
ANNEX 10 — VOLUME I ATT C-1 23/11/06
Annex 10 — Aeronautical Communications Volume I
Localizer system ILS glide path system
Indicated course line. The locus of points in any
horizontal plane at which the receiver indicator
deflection is zero.
Indicated ILS glide path. The locus of points in the
vertical plane containing the runway centre line at
which the receiver indicator deflection is zero.
Indicated slant course line. The line formed at the intersection of the indicated course surface and the plane of the
nominal ILS glide path.
Indicated ILS glide path angle. The angle above the
horizontal plane of the indicated ILS glide path.
Indicated course sector. A sector in any horizontal
plane containing the indicated course line in which
the receiver indicator deflection remains within fullscale
values.
Indicated ILS glide path sector. The sector containing
the indicated ILS glide path in which the receiver
indicator deflection remains within full-scale
values.
Localizer course bend. A course bend is an aberration
of the localizer course line with respect to its
nominal position.
ILS glide path bend. An ILS glide path bend is an
aberration of the ILS glide path with respect to its
nominal position.
Incremental sensitivity. The increment of receiver indicator current per unit change of receiver antenna displacement
from the nominal course line or nominal ILS glide path.
Flat zone. A zone within an indicated course sector or an indicated ILS glide path sector in which the slope of the
sector characteristic curve is zero.
Reversal zone. A zone within an indicated course sector or an indicated ILS glide path sector in which the slope of the
sector characteristic curve is negative.
2. Material concerning ILS installations
2.1 Operational objectives, design and maintenance objectives,
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