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and maintained within plus or minus 20 per cent of the nominal value selected.
3.1.5.6.8 For Facility Performance Category III — ILS glide paths, the angular displacement sensitivity shall be adjusted
and maintained within plus or minus 15 per cent of the nominal value selected.
Note.— Guidance material on ILS glide path adjustment and maintenance values is given in Attachment C, 2.1.5.
3.1.5.7 Monitoring
3.1.5.7.1 The automatic monitor system shall provide a warning to the designated control points and cause radiation to
cease within the periods specified in 3.1.5.7.3.1 if any of the following conditions persist:
a) shift of the mean ILS glide path angle equivalent to more than minus 0.075 θ to plus 0.10 θ from θ;
b) in the case of ILS glide paths in which the basic functions are provided by the use of a single-frequency system, a
reduction of power output to less than 50 per cent of normal, provided the glide path continues to meet the
requirements of 3.1.5.3, 3.1.5.4 and 3.1.5.5;
c) in the case of ILS glide paths in which the basic functions are provided by the use of two-frequency systems, a
reduction of power output for either carrier to less than 80 per cent of normal, except that a greater reduction to
between 80 per cent and 50 per cent of normal may be permitted, provided the glide path continues to meet the
requirements of 3.1.5.3, 3.1.5.4 and 3.1.5.5;
Note.— It is important to recognize that a frequency change resulting in a loss of the frequency difference
specified in 3.1.5.2.1 may produce a hazardous condition. This problem is of greater operational significance for
Categories II and III installations. As necessary, this problem can be dealt with through special monitoring
provisions or highly reliable circuitry.
d) for Facility Performance Category I — ILS glide paths, a change of the angle between the glide path and the line
below the glide path (150 Hz predominating) at which a DDM of 0.0875 is realized by more than plus or minus
0.0375 θ;
e) for Facility Performance Categories II and III — ILS glide paths, a change of displacement sensitivity to a value
differing by more than 25 per cent from the nominal value;
f) lowering of the line beneath the ILS glide path at which a DDM of 0.0875 is realized to less than 0.7475 θ from
horizontal;
g) a reduction of DDM to less than 0.175 within the specified coverage below the glide path sector.
Note 1.— The value of 0.7475 θ from horizontal is intended to ensure adequate obstacle clearance. This value was
derived from other parameters of the glide path and monitor specification. Since the measuring accuracy to four significant
figures is not intended, the value of 0.75 θ may be used as a monitor limit for this purpose. Guidance on obstacle clearance
criteria is given in the PANS-OPS (Doc 8168).
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-20
Note 2.— Subparagraphs f) and g) are not intended to establish a requirement for a separate monitor to protect against
deviation of the lower limits of the half-sector below 0.7475 θ from horizontal.
Note 3.— At glide path facilities where the selected nominal angular displacement sensitivity corresponds to an angle
below the ILS glide path which is close to or at the maximum limits specified in 3.1.5.6, it may be necessary to adjust the
monitor operating limits to protect against sector deviations below 0.7475 θ from horizontal.
Note 4.— Guidance material relating to the condition described in g) appears in Attachment C, 2.4.13.
3.1.5.7.2 Recommendation.— Monitoring of the ILS glide path characteristics to smaller tolerances should be
arranged in those cases where operational penalties would otherwise exist.
3.1.5.7.3 The total period of radiation, including period(s) of zero radiation, outside the performance limits specified in
3.1.5.7.1 a), b), c), d), e) and f) shall be as short as practicable, consistent with the need for avoiding interruptions of the
navigation service provided by the ILS glide path.
3.1.5.7.3.1 The total period referred to under 3.1.5.7.3 shall not exceed under any circumstances:
6 seconds for Category I — ILS glide paths;
2 seconds for Categories II and III — ILS glide paths.
Note 1.— The total time periods specified are never-to-be-exceeded limits and are intended to protect aircraft in the final
stages of approach against prolonged or repeated periods of ILS glide path guidance outside the monitor limits. For this
reason, they include not only the initial period of outside tolerance operation but also the total of any or all periods of
outside tolerance radiation, including periods of zero radiation, which might occur during action to restore service, for
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