getting to grips with surveillance(50)

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3.1.7.2.4. Advisory Inhibition
When the own aircraft is below an altitude limit ± margin (+ in climb, - in descent), the TCAS automatically activates some inhibition logics.
Altitude limit  Inhibition 
Above 48000 ft MSL  RA CLIMB CLIMB is inhibited to preserve aircraft performances. 
Above 15500 ft MSL  TCAS does not interrogating Mode A aircraft or Mode C aircraft without altitude information (when ALT RPTG of these aircraft is set to OFF). However, TCAS still interrogates Mode S aircraft even they do not report their altitude. 
Below 1700 ft AGL  The Ground logic is activated: any aircraft operating in Mode C only that are below 380 ft AGL (relative to the own aircraft, see Figure 3-9) are declared on ground. See note below. 
Below 1550 ft AGL  RA INCREASE DESCENT is inhibited. 
Below 1100 ft AGL  RA DESCENT is inhibited. 
Below 1000 ft AGL  TA ONLY is automatically activated. 
Below 500 ft AGL  TA aural alerts are inhibited. 

Note: The ground logic only applies to surrounding aircraft that operate in Mode
C. Mode S aircraft transmit an explicit indication when airborne or on ground.

3.1.8. TCAS CONTROLS
The flight crew selects the TCAS operating modes via two different switches as follows:
- STBY: TCAS inhibits aural and visual indications. The EWD displays the green TCAS STBY memo.
- TA: TCAS converts all RAs in TAs (aural and visual alerts). The ND displays the white TA ONLY message.
- TA/RA: TCAS operates normally.
- THRT: TCAS displays OTHER or PROXIMATE aircraft on ND only if the TCAS already displays a TA or RA aircraft.
- ALL: TCAS displays surrounding aircraft in the surveillance envelope between –2 700 ft and +2 700 ft (refer to Figure 3-5).
- ABV: TCAS displays surrounding aircraft in the surveillance envelope between –2 700 ft and +9 900 ft (refer to Figure 3-5).
- BLW:. TCAS displays surrounding aircraft in the surveillance envelope between –9 900 ft and +2 700 ft (refer to Figure 3-5).
Figure 2-2 gives an example of ATC/TCAS panel.

For more details, please refer to your FCOM.
3.2. OPERATIONAL RECOMMENDATIONS FOR TCAS

The Eurocontrol ACAS II bulletins analyze in-service incidents/accidents and provide recommendations that prevent the occurrences of such incidents/accidents. Some of the following recommendations are extracted from the Eurocontrol ACAS II bulletins, available at the time of writing the brochure.
3.2.1. FOR THE AIRLINE
.  
Recurrently train your flight crews to use TCAS and to respond to RA safely and efficiently (especially responses to RA “ADJUST VERTICAL SPEED, ADJUST”).

.  
Refer to ICAO Doc 9863 – Airborne Collision Avoidance System (ACAS) Manual and Part III, Section 3, Attachment of Chapter 3 of Aircraft Operations – Flight Procedures, Doc 8168-OPS/611, Volume I for pilot training guidelines (see References).
　
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