getting to grips with surveillance(60)

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When a piece of information is not available, dashes replace the piece of information (except wake vortex category) in the TRAFFIC INFORMATION page.
From the MCDU, the flight crew may select or deselect (LSK 6R) the aircraft displayed in the TRAFFIC INFORMATION page. The TCAS computer accordingly updates the ND.
The flight crew selects the TRAFFIC LIST RETURN prompt (LSK 6L) to return to the TRAFFIC LIST page.
The flight crew can scroll the Traffic List from the TRAFFIC INFORMATION page with the MCDU SLEW keys (↑↓).

 

3.6.4.2.3. ITP Traffic List Page
The flight crew uses the ITP TRAFFIC LIST page to initiate the In-Trail Procedure (refer to Appendix C –

details).
The flight crew must enter the desired FL in the amber boxes (LSK 1L).
The FLT ID ON function (LSK 6R) is identical to the one available in the TRAFFIC LIST page (refer to 3.6.5.1 – MCDU controls).
The flight crew selects the RETURN prompt (LSK 6L) to return to the TRAFFIC LIST page.
When the flight crew entered the desired FL, the TCAS computer computes the opportunity to perform an ITP (refer to C.2.5 – ITP Distance). The ITP Traffic List displays:
- 
The flight level taken into account for the computation (LSK 1L)

- 
The opportunity to perform an ITP (LSK 1R)

- 
The ITP distances to aircraft included in the ITP volume (LSK 3L to 5L, refer to

 

C.2.5 – ITP Distance and C.2.3 – ITP Volume). The ITP Traffic List displays only aircraft that are on the same direction (refer toC.2.2 – Aircraft on the Same Direction).

The TCAS computer displays the message TRAFFIC AT FLXXX RNGYY  (refer to Figure 3-24) when:
- A surrounding aircraft is within 80 NM and at the desired FL entered in LSK 1L, or
- 
There is a TCAS Only aircraft between the current FL and the desired FL, or

- 
There is an ADS-B Only aircraft on the track at less than 30 NM, or

- 
There is an aircraft not on the same direction between the current FL and the desired FL.

 

When the ITP is not possible, the TCAS computer provides the reasons that prevent the ITP:
- Below the in-trail distance (refer to Figure 3-25):
o  DISTANCE when the distance criterion is not met, or

o  REL SPEED when the relative speed criterion is not met, or

o  NO FLT ID when the flight number is not available.

- Next to LSK 2R when there are more than two aircraft in the ITP volume. Refer to Figure 3-26.

Note: The ITP Traffic List is sorted as follows:
- 
When ITP is possible, aircraft are displayed from the farthest one in front of the own aircraft (e.g. 45 NM BEHIND AZE1597) to the farthest one after the own aircraft (e.g. 32 NM AHEAD OF VBN8624).

- 
When ITP is not possible, aircraft that block the ITP procedure are displayed first.
　
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