R 1EFF : 001-049, 051-099, 101-105, 1 34-43-00Page 92 1 1 May 01/05 1 1 1CES 1R ----------------------------------------------------------------------R | | TAU thresholds | Vertical separation | R | | | thresholds | R |-----------------------------|----------------|---------------------| R | Source | Altitude | SL TA RA | S0 S1 S2 | R | Altitude | | | TA RA RA | R | | | | prev cor | R | | | (sec) (sec) | (ft) (ft) (ft) | R |------------|----------------|----------------|---------------------| R | Radio Alt |less than 1000 | 2 20 | 850 | R | Radio Alt | 1000-2350 | 3 25 15 | 850 600 300 | R | Baro | 2350-5000 | 4 30 20 | 850 600 300 | R | Baro | 5000-10,000 | 5 40 25 | 850 600 350 | R | Baro | 10,000-20,000 | 6 45 30 | 850 600 400 | R | Baro | 20,000-42,000 | 7 48 35 | 850 700 600 | R | Baro |more than 42,000| 7 48 35 | 1200 800 700 | R ----------------------------------------------------------------------
R NOTE : This table shows the sensitivity levels based on the TCAS
____ R altitude. There is an hysteresis when switching from a sensitivity R level to another one: R - 1000 plus or minus 100 ft; R - 2350 plus or minus 200 ft; R - 5000 plus or minus 500 ft; R - 10,000 plus or minus 500 ft; R - 20,000 plus or minus 500 ft; R - 42,000 plus or minus 500 ft. R for example: switching from SL3 to SL2 is performed at 900 ft R and switching from SL2 to SL3 at 1100 ft. R Level 1 corresponds to Standby Mode in which no advisory is R generated. R (Ref. Fig. 024B) R There are two other means of modifying the sensitivity level: R - selecting TA only mode on the ATC/TCAS control unit forces level R 2. In this case, intruders of all types are displayed but are R not transformed into RA symbols and no vertical speed R modification indications are issued. R - the ATC/Mode S-equipped ground stations may modify the R sensitivity level of the aircraft TCAS via the uplink without, R however, having the capability to force the Standby Mode. If R several ground stations command sensitivity levels, the TCAS R logic selects the lowest level. R Definition of priority logic:
R 1EFF : 051-099, 1 34-43-00Page 93 1 1 May 01/05 1 1 1CES 1
TCAS - Separation into Altitude Layers
Figure 024A
R 1EFF : 106-149, 201-207, 211-299, 301-399, 1 34-43-00Page 94 1401-499, 1Aug 01/05 1 1 1CES 1
TCAS - Separation into Altitude Layers
Figure 024B
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 34-43-00Page 95 1201-210, 1May 01/05 1 1 1CES 1 First a sensitivity level based on altitude is selected. Level 2 is selected if the radio altimeter altitude is less than 1000 ft. Level 2 is also selected if own aircraft is configured such that both CLIMB and DESCEND RAs are inhibited (e.g., below 1000 ft AGL with insufficient climb performance). Level 3 is selected if the aircraft is above 1000 ft and below 2350 ft AGL. Level 4 is selected if the aircraft is above 2350 ft and below 5000 ft AGL. Level 3 is the least sensitive of the levels selected automatically by the TCAS; in fact in this altitude layer, the numerous inhibitions reduce the appearance of RA. If the aircraft is above 2500 ft AGL, barometric altitude is used to select either level 4 (from 2350 to 5000 ft), 5 (from 5000 to 10,000 ft), 6 (from 10,000 to 20,000 ft) and 7 (above 20,000 ft).
NOTE : Intruders which do not report their altitude are not displayed
____
above 15,500 ft.
ATC/TCAS control unit input is read by the TCAS computer. If the pilot has selected Automatic Mode (TA/RA), then the altitude-based sensivity level is used in comparisons to determine the final level. From all sensitivity level commands, if any, received from ground stations, the lowest is selected. If the TA ONLY mode is selected, either manually via the control unit or by a ground station, the altitude-based sensitivity level is used for TA thresholds and the RAs are inhibited. Otherwise, the lowest of all inputs is chosen. 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320飛機維護手冊 AMM NAVIGATION 導航3(120)
