getting to grips with surveillance(80)

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The detection of an aircraft approaching a runway is based on the intersection of the Aircraft Protection Volume with the Runway Area. The shape and the orientation of the Aircraft Protection Volume depend on the aircraft dynamics (speed, acceleration, turn rate). The Runway Area is an area with a 60-m clearance (200 ft) from the runway edges.

 

OANS triggers the APPROACHING RUNWAY advisory 7 s before the aircraft nose reaches the Runway Area.
OANS displays the APPROACHING RUNWAY advisory when:
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The aircraft is on ground

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The ground speed is below 40 kt

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The aircraft nose is at 7 s from the runway area.

The APPROACHING RUNWAY advisory is displayed for at least 10 s. It is cleared when:
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The aircraft stops, or

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The aircraft nose has been inside the runway area for 2 s, or

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The aircraft has exited the runway area for 7 s, or

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The advisory has been displayed for more than 30 s.

5.1.3. OANS INDICATIONS
The OANS indications are displayed on ND and are split into three parts.
The upper banner includes the ground speed and the airport name.
The airport map is the background of the ND. The flight crew can interact with the airport map thanks to the Interactive Control Menu (refer to
5.1.4.5 – Interactive Control Menu).
The Soft Control Panel provides several controls (e.g. airport selection, activation of new ADB, addition of crosses and flags, etc). Refer to 5.1.4.6
– Soft Control Panel.

5.1.3.1. AIRCRAFT SYMBOL
When OANS is active, the aircraft symbol displayed on ND is magenta instead of yellow. Indeed, as many indications are displayed in yellow, a magenta aircraft symbol provides a better legibility.

For display ranges from 0.5 to 5 NM, the aircraft symbol is displayed with the same size (Figure 5-4).
For the display range of 0.2 NM:
- If the distance from the aircraft nose to the Aircraft

- If the distance from the aircraft nose to the Aircraft Reference Point is not zero, the aircraft symbol is displayed to scale (Figure 5-5).
Note 1: The distance from the aircraft nose to the Aircraft Reference Point is defined via a SPP. Note 2: The aircraft symbol reference point is the intersection of the two bars. The actual Aircraft Reference Point is the projection of the 25% MAC on the aircraft longitudinal axis.
The aircraft symbol is not displayed when the aircraft position data from either IRS or MMR are not available or invalid. Consequently, the amber message ARPT NAV POS LOST is displayed on the airport map.
5.1.3.2. FMS ACTIVE RUNWAY
The active runway selected in the FMS flight plan is highlighted on the OANS display:
- The runway reference (either on the runway label or the runway threshold) displayed in green
- A green triangle next to the active runway threshold.
　
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