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40 per cent by a 90 Hz tone and 40 per cent by a 150 Hz tone, a zero indication is achieved and that, upon a simultaneous
increase in one component of 5.25 per cent (i.e. to 45.25 per cent) and a decrease in the other component of 5.25 per cent (i.e.
to 34.75 per cent), there is a proportional deflection of 3/5 of full course width indication but not less than 9.5 mm along its
scale. This gain adjustment is to be made with the normal power supply voltage encountered under airborne operational
conditions.
2.2.11 Glide path receiving equipment centring tolerance
2.2.11.1 To obtain the operational objectives associated with ILS Performance Categories I, II and III and to ensure the
safe operation of aircraft within the obstacle clearance surfaces, the centring error of the receiving equipment, operating
within all likely aircraft environmental conditions and receiving a zero signal (DDM) within the limits of the ground
equipment radio frequency modulation characteristics and identification tolerances, as specified in Chapter 3, 3.1.5, and with
an RF field strength of 400 microvolts per metre (minus 95 dBW/m2), should not exceed the following limits with a 68 per
cent probability:
Category I: 5.33 per cent of the full course width indication (0.0093 DDM)
Category II: 3.33 per cent of the full course width indication (0.0058 DDM)
Category III: 3.33 per cent of the full course width indication (0.0058 DDM)
Note.— These operational requirements are also to be met at larger field strengths up to the maximum field strength
likely to be encountered in operational service.
2.2.12 Glide path course displacement sensitivity (deflection) tolerance
2.2.12.1 When the receiver audio gain has been adjusted in accordance with 2.2.10, and with an increase in one
modulation tone of the radio frequency input signal of 5.25 per cent (i.e. to 45.25 per cent) and a simultaneous decrease of the
23/11/06 ATT C-18
Attachment C Annex 10 — Aeronautical Communications
other component of 5.25 per cent (i.e. to 34.75 per cent), the displacement signal should not vary more than plus or minus
0.016 DDM from the nominal value at a signal strength of 400 microvolts per metre (minus 95 dBW/m2) up to the maximum
field strength likely to be encountered in operational service.
Note.— See 2.2.13 in respect to signal levels.
2.2.13 Glide path receiving system minimum signal level sensitivity
2.2.13.1 The sensitivity of the glide path receiving system should be such that, in a high percentage of cases, the
receiver should indicate a usable signal and a substantially steady indication in the presence of the minimum field strength
specified in Chapter 3, 3.1.5.3.2 (400 microvolts per metre or minus 95 dBW/m2).
Note 1.— The maximum signal level likely to be encountered under 2.2.11 and 2.2.12 is 2 500 microvolts. This signal
level occurs when the aircraft is at the runway threshold.
Note 2.— The two levels of sensitivity addressed in 2.2.12 and 2.2.13 ensure:
a) a high quality output such as is necessary for approach purposes; and
b) an output of lesser quality adequate for operational usage of the facility in other parts of the coverage volume.
Note 3.— The proper operation of the glide path receiving system in the presence of the specified minimum field strength
should occur also if the aircraft longitudinal axis is varied plus or minus 10 degrees in the horizontal plane together with 20
degrees roll about the localizer course line and also plus or minus 10 degrees pitch in the vertical plane about the horizontal
plane.
2.2.14 Glide path displacement linearity
2.2.14.1 The receiver output glide path displacement signal should be a substantially linear function of the DDM of the
receiver input signal. For any input over the range plus or minus 0.175 DDM, and for any RF signal strength likely to be
encountered in operational service, the displacement sensitivity should not depart from the nominal DDM/deflection ratio
defined in 2.2.10 by more than plus or minus 20 per cent. For an input signal of 0.185 DDM or greater, the output must be
greater than full course displacement.
Note.— See 2.2.13 with respect to signal levels.
2.2.15 Glide path receiver bandwidth
2.2.15.1 The receiver bandwidth should be such as to provide for the reception of channels having the characteristics
defined in Chapter 3, 3.1.5.2.1 after taking suitable account of appropriate receiver tolerances.
2.2.16 Glide path receiver susceptibility to glide path signal
2.2.16.1 The receiver design should provide correct operation in the following environment:
a) the desired signal exceeds an undesired co-channel signal by 20 dB or more;
b) an undesired glide path signal, 150 kHz removed from the desired signal, exceeds the desired signal by up to 20 dB.
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