Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3579

d) deterioration in service between maintenance periods. The words receiving equipment , as used in this section, include the receiver itself, the antenna(s) and the necessary interconnections in the aircraft. 2.2.1 General 2.2.1.1 In order to ensure consistent and reliable operation, the output characteristics of the receiver in respect of course line (centring) and course width (deflection) should be maintained to a degree of accuracy appropriate to the operational objective. Attention is directed towards the need to take into account the variable conditions that may affect such accuracy. 2.2.1.2 Furthermore, in order to ensure that a constant course width is realized by all users of the ILS system, it is necessary to standardize the overall gain of the localizer receiver. Similar considerations apply in the case of the glide path receiver. ATT C-15 23/11/06 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I 2.2.2 Localizer receiver audio gain ad ustment 2.2.2.1 The audio gain of the receiver should be such that, with a radio frequency input of 1 000 microvolts modulated 20 per cent by a 90 Hz tone and 20 per cent by a 150 Hz tone, a zero indication is achieved and that, upon a simultaneous increase in one component of 4.65 per cent (i.e. to 24.65 per cent) and a decrease in the other component of 4.65 per cent (i.e. to 15.35 per cent), there is a proportional deflection of 3/5 of the 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 operating conditions. 2.2.3 Localizer receiving equipment centring tolerance 2.2.3.1 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 the 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, 3.1.3, and with an RF field strength of 90 microvolts per metre (minus 107 dBW/m2), should not exceed the following limits with a 68 per cent probability: Category I: 4.66 per cent of the full course width indication (0.0072 DDM) Category II: 2.33 per cent of the full course width indication (0.0036 DDM) Category III: 1.66 per cent of the full course width indication (0.00258 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. 2.2.4 Localizer course displacement sensitivity (deflection) tolerance 2.2.4.1 When the receiver audio gain has been adjusted in accordance with 2.2.2, and with an increase in one modulation tone of the audio frequency input signal of 4.65 per cent with respect to the nominal value (i.e. 24.65 per cent) and a simultaneous decrease of the other component by 4.65 per cent with respect to the nominal value (i.e. 15.35 per cent), the indicated deflection signal should not vary more than plus or minus 0.019 DDM from the nominal value at a signal strength of 90 microvolts per metre (minus 107 dBW/m2) up to the maximum field strength likely to be encountered in operational service. Note.— See 2.2.5 in respect to signal levels. 2.2.5 Localizer receiving system minimum signal level sensitivity 2.2.5.1 The sensitivity of the localizer receiving equipment should be such that in a high percentage of cases, the receiver indicates a usable signal and a substantially steady indication in the presence of the minimum field strength specified in Chapter 3, 3.1.3.3.2 (40 microvolts per metre or minus 114 dBW/m2). Note 1.— The maximum signal level likely to be encountered under 2.2.3 and 2.2.4 is 500 microvolts. Signal levels on the order of 5 000 microvolts may be encountered in the near vicinity of the transmitter (e.g. when flying over the localizer during a missed approach, or when the localizer is used for rollout or take-off guidance). Note 2.— The two levels of sensitivity addressed in 2.2.4 and 2.2.5 ensure 23/11/06 ATT C-16 2007/70/II. szám Attac ment C Annex 10 — Aeronautical Communications

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