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7 Alarm and Warning Settings
7.1 Monitor alarm settings shall not exceed the limits given in Table 1 (1165). This requirement applies to all monitors on which the integrity of the ILS is based (1801).
7.2 On a system where several sets of monitors have been considered in the integrity assessment, the system shall be adjusted to a point where sufficient alarms on those monitors are generated to cause a changeover/shutdown (1172).
7.3 If flight or ground tests show that the change measured in the field exceeds the limits given in Table 1 with the transmitter set to the alarm condition, then the monitor system shall be adjusted to tighter limits than those given in Table 1 (1802).
7.4 Monitor limits shall not be so tight that equipment instability can cause false shutdowns (1167).
Table 1 Monitor Alarm Limits
Parameter CAT I CAT II CAT III
LOCALISER
Alignment at threshold ±1.5% ddm (15μA) (1803) ±1.1% ddm (11μA) (1804) ±0.9% ddm (8μA) (1827)
Displacement Sensitivity ±17% of nominal input (1828). The ICAO Annex 10 standard that a localiser width angle must not exceed 6° is interpreted as an 'adjust and maintain' limit. The system alarms will still be set to ±17% of the nominal input (1829). Field measurement is of nominal displacement sensitivity (1830).
Localiser with no separate clearance system ±10% of nominal input. If clearance in the region between ±10° and ±35° is at any point <170 μA (1831).
Clearance ±20%of nominal input (1833)
Localiser with a separate clearance transmitter ±10% of the nominal clearance input if clearance in the region between ±10° and ±35° is at any point <170 μA (1834)
Frequency Difference (Dual Frequency) 5KHz to 14KHz (2376)
RF Level Single Frequency -3dB provided that coverage is satisfactory when the power is reduced to the alarm limit (1837)
RF Level Dual Frequency ±1dB Unless tests have shown that a wider limit may be used (1838).
GLIDEPATH
Alignment -0.0752 (5.5% ddm 47 μA) (2377) +0.12 (7.3% ddm 63 μA) (2378)
Displacement Sensitivity ±25% of nominal input (1841) Field measurement is of nominal displacement sensitivity (1842).
Glidepath with no separate clearance transmitter: ±20% of the nominal displacement sensitivity. If the 'fly up' signal at 0.32 is <200 μA (1843).
Clearance ±20% of nominal input (1844)
Frequency Difference (Dual Frequency) 4KHz to 32KHz (2379)
Table 1 Monitor Alarm Limits (Continued)
Parameter CAT I CAT II CAT III
RF Level Single Frequency -3dB provided that coverage is satisfactory when the power is reduced to the alarm limit (1847)
RF Level Dual Frequency ±1dB Unless tests have shown that a wider limit may be used (1848).
8 Changeover and Shutdown Times
8.1 The maximum TOTAL time of false radiation shall not exceed the number of seconds shown in Table 2 (1187).
NOTE: In the case of a common fault, e.g. the aerial system, in a system configured for immediate changeover, the quoted time is the total time from beginning of the fault until final shutdown of the system.
8.2 For category I and II systems, where immediate changeover is not provided, the delay from the time of shutdown of the main transmitter to the start of radiation from the standby transmitter shall be 20 ± 2 seconds (1188).
8.3 For systems having this delay, the figures given in Table 2 shall apply separately to each transmitter of the system (1189).
Table 2 Changeover and Shutdown Times (in seconds)
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本文链接地址：CAP 670 Air Traffic Services Safety Requirements 2(31)
