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and 150 Hz wave forms pass through zero in the same direction within:
a) for Facility Performance Categories I and II — ILS glide paths: 20 degrees;
b) for Facility Performance Category III — ILS glide paths: 10 degrees,
of phase relative to the 150 Hz component, every half cycle of the combined 90 Hz and 150 Hz wave form.
Note 1.— The definition of phase relationship in this manner is not intended to imply a requirement for measurement of
phase within the ILS half glide path sector.
Note 2.— Guidance material relating to such measures is given at Figure C-6 of Attachment C.
3.1.5.5.3.1 With two-frequency glide path systems, 3.1.5.5.3 shall apply to each carrier. In addition, the 90 Hz
modulating tone of one carrier shall be phase-locked to the 90 Hz modulating tone of the other carrier so that the
demodulated wave forms pass through zero in the same direction within:
a) for Categories I and II — ILS glide paths: 20 degrees;
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-18
b) for Category III — ILS glide paths: 10 degrees,
of phase relative to 90 Hz. Similarly, the 150 Hz tones of the two carriers shall be phase-locked so that the demodulated wave
forms pass through zero in the same direction, within:
1) for Categories I and II — ILS glide paths: 20 degrees;
2) for Category III — ILS glide paths: 10 degrees,
of phase relative to 150 Hz.
3.1.5.5.3.2 Alternative two-frequency glide path systems that employ audio phasing different from the normal in-phase
condition described in 3.1.5.5.3.1 shall be permitted. In these alternative systems, the 90 Hz to 90 Hz phasing and the 150 Hz
to 150 Hz phasing shall be adjusted to their nominal values to within limits equivalent to those stated in 3.1.5.5.3.1.
Note.— This is to ensure correct airborne receiver operation within the glide path sector where the two carrier signal
strengths are approximately equal.
3.1.5.5.4 Recommendation.— Undesired frequency and phase modulation on ILS glide path radio frequency carriers
that can affect the displayed DDM values in glide path receivers should be minimized to the extent practical.
Note.— Relevant guidance material is given in 2.15 of Attachment C.
3.1.5.6 Displacement sensitivity
3.1.5.6.1 For Facility Performance Category I — ILS glide paths, the nominal angular displacement sensitivity shall
correspond to a DDM of 0.0875 at angular displacements above and below the glide path between 0.07 θ and 0.14 θ.
Note.— The above is not intended to preclude glide path systems which inherently have asymmetrical upper and lower
sectors.
3.1.5.6.2 Recommendation.— For Facility Performance Category I — ILS glide paths, the nominal angular
displacement sensitivity should correspond to a DDM of 0.0875 at an angular displacement below the glide path of 0.12 θ
with a tolerance of plus or minus 0.02 θ. The upper and lower sectors should be as symmetrical as practicable within the
limits specified in 3.1.5.6.1.
3.1.5.6.3 For Facility Performance Category II — ILS glide paths, the angular displacement sensitivity shall be as
symmetrical as practicable. The nominal angular displacement sensitivity shall correspond to a DDM of 0.0875 at an angular
displacement of:
a) 0.12 θ below path with a tolerance of plus or minus 0.02 θ;
b) 0.12 θ above path with a tolerance of plus 0.02 θ and minus 0.05 θ
3.1.5.6.4 For Facility Performance Category III — ILS glide paths, the nominal angular displacement sensitivity shall
correspond to a DDM of 0.0875 at angular displacements above and below the glide path of 0.12 θ with a tolerance of plus or
minus 0.02 θ.
3.1.5.6.5 The DDM below the ILS glide path shall increase smoothly for decreasing angle until a value of 0.22 DDM is
reached. This value shall be achieved at an angle not less than 0.30 θ above the horizontal. However, if it is achieved at an
angle above 0.45 θ, the DDM value shall not be less than 0.22 at least down to 0.45 θ or to such lower angle, down to 0.30 θ,
as required to safeguard the promulgated glide path intercept procedure.
Chapter 3 Annex 10 — Aeronautical Communications
3-19 23/11/06
Note.— The limits of glide path equipment adjustment are pictorially represented in Figure C-11 of Attachment C.
3.1.5.6.6 For Facility Performance Category I — ILS glide paths, the angular displacement sensitivity shall be adjusted
and maintained within plus or minus 25 per cent of the nominal value selected.
3.1.5.6.7 For Facility Performance Category II — ILS glide paths, the angular displacement sensitivity shall be adjusted
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