5.6.1.2. ROW ARMED
ROW arms when the landing runway is automatically detected (refer to 5.6.1.1 –
Automatic Detection of the Runway for Landing). Therefore:
- OANS highlights QFU of the automatically detected runway.
- ROW computes, in real time, the minimal braking distances in dry and wet conditions.
- If the flight crew selects BTV, OANS displays the braking distances computed in dry and wet conditions (DRY and WET lines – refer to 5.6.3.1
– ROW Indications When Armed) over the landing runway. As ROW computes the minimal braking distances in real time, OANS adjusts the DRY and WET lines on the landing runway.
5.6.1.3. ROW ENGAGED
ROW engages when the minimal braking distance computed in dry or wet conditions exceeds LDA. It means that ROW engages when the DRY or WET line (in BTV mode only) exceeds the runway end on OANS display.
When ROW engages, it triggers an alert with visual and/or2 aural indications:
-
When the braking performances computed in wet conditions are not sufficient and the runway is currently wet, the flight crew should perform a go-around.
-
When the braking performances computed in wet conditions are not sufficient and the runway is currently dry, the flight crew should disregard the alert.
-
When the braking performances computed in dry conditions are not sufficient, the flight crew should perform a go-around.
ROW disengages and disarms when the flight crew performs a go-around.
ROW disengages (but remains armed) when updated braking distances in dry and wet conditions do not exceed LDA anymore.
2 ROW triggers an aural alert only below 200 ft RA when the braking performances in dry conditions are not sufficient.
5.6.1.4. ROP ARMED
ROP arms when the auto brake engages. The auto brake engages in landing mode when:
- The ground spoilers extend and the nose landing gear is on ground, or
- 5 seconds after the ground spoiler extension, whichever occurs first.
When ROP arms:
- ROP computes, in real time, a braking distance to reach a target speed that equals to: .. 0 kt if the flight crew selected an auto brake mode (except
BTV), or .. 10 kt if the flight crew selected BTV.
- OANS displays this computed braking distance over the landing runway (STOP bar – refer to 5.6.3.3 -ROP Indications When Armed).
ROP remains armed until the flight crew disconnects the auto brake.
5.6.1.5. ROP ENGAGED
ROP engages:
- When the STOP bar exceeds the runway end, or
- As soon as the auto brake engages if ROW had previously engaged between the deployment of ground spoilers and the activation of auto brake.
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