-
below 1200 ft AGL at take-off and 1000 ft AGL in approach, inhibition of "Descend" resolution advisories (RA)
-
below 1100 ft AGL at take-off and 900 ft AGL in approach, inhibition of all aural traffic advisories (TA) and all resolution advisories (RA).
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TCAS - Inhibition Condition Figure 023
R 1EFF : 1 1 1CES ALL 1 111 34-43-00 Page 86 May 01/05
(b)
High altitude inhibition Above 48,000 ft, further climb orders are inapplicable as the aircraft performance capability does not permit them to be taken into account. "Climb" advisories are therefore inhibited above this altitude.
(c)
Advisory inhibit discretes Three discretes are used to manage priority between:
-windshear/stall
-GPWS - G/S
-and the TCAS computer. The environmental alert priorities are: windshear/stall, GPWS -G/S and then TCAS II. When TCAS II is inhibited, the TA ONLY mode is selected and the voice announcements are cancelled.
(d)
Rejection of signals from aircraft on ground (Ref. Fig. 023) Aircraft on the ground may reply to TCAS interrogations, producing an unnecessary overload in the processing and display of information. The ground logic "aircraft declared on the ground" is enabled when the own aircraft descends below 1650 ft AGL and when it climbs up to 1750 ft AGL. All on-ground intruders are displayed as non-threat traffic white unfilled diamond. Intruders are declared to be on-ground if they are within 380 ft from the ground when descending, and if they are within 400 ft from the ground when climbing. Intruders declared to be on-ground can never cause proximate, traffic or resolution advisory. But, as the altitude transmitted by the intruder is a barometric altitude with respect to sea level, the TCAS shall process this value to convert it into height above ground level in order to compare it with the 380 ft (+ or - 20 ft) threshold.
(e)
Rejection of non altitude reporting aircraft by the own aircraft The TCAS does not display "non altitude reporting aircraft" above 15,500 ft MSL.
R 1EFF : 106-149, 201-207, 210-299, 301-399, 1 34-43-00Page 87 1401-499, 1Aug 01/05 1 1 1CES 1
R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-209,
R Post SB 34-1177 For A/C 001-049,101-105, Post SB 34-1179 For A/C 201-207,
(5) Advisory inhibit conditions In certain particular conditions, certain advisories are not generated as they could lead to the pilot adopting flight conditions that are hazardous or outside the aircraft's performance capability.
(a)
Low altitude inhibitions Ground proximity leads to the inhibition of those advisories liable to cause a hazardous situation at this level. In decreasing altitude, these are:
-
below 1550 +/- 100 ft above ground level (AGL) inhibition of "Increase Descend" resolution advisories (RA),
-
below 1100 +/- 100 ft AGL at take-off and 500 ft AGL in approach, inhibition of "Descend" resolution advisories (RA),
-
below 500 +/- 100 ft AGL (600 ft in climb, 400 ft in descent), inhibition of all resolution advisories (RA) and of aural traffic advisories (TA).
(b)
High altitude inhibition Above 48,000 ft, further climb orders are inapplicable as the aircraft performance capability does not permit them to be taken into account. "Climb" advisories are therefore inhibited above this altitude.
(c)
Advisory inhibit discretes Three discretes are used to manage priority between:
-windshear/stall,
-GPWS - G/S,
-and the TCAS computer. The environmental alert priorities are: windshear/stall, GPWS -G/S and then TCAS II. When TCAS II is inhibited, the TA ONLY mode is selected and the voice announcements are cancelled.
(d)
Rejection of signals from aircraft on ground (Ref. Fig. 023) Aircraft on the ground may reply to TCAS interrogations, producing an unnecessary overload in the processing and display of information. The ground logic "aircraft declared on the ground" is enabled when the own aircraft descends below 1650 ft AGL and when it climbs up to 1750 ft AGL. All on-ground intruders are displayed as non-threat traffic white unfilled diamond.
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 34-43-00Page 88 1201-209, 1May 01/05 1 1 1CES 1 Intruders are declared to be on-ground if they are within 380 ft from the ground when descending, and if they are within 400 ft from the ground when climbing. Intruders declared to be on-ground can never cause proximate, traffic or resolution advisory. But, as the altitude transmitted by the intruder is a barometric altitude with respect to sea level, the TCAS shall process this value to convert it into height above ground level in order to compare it with the 380 ft (plus or minus 20 ft) threshold.
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