Runway Overrun Protection System (ROPS) Flashcards
Purpose
- to alert the flight crew in the case of potential runway overrun situation for dry
and wet runway.
ROW Function
automatically arms at 400 ft AGL and works until start of braking,
ROP Function
It works from start of braking until the aircraft stops
Description
The ROW/ROP functions compute both the wet and dry landing distances for the current conditions.
The system then compares these values with the LDA of the landing runway.
To detect the landing runway, the ROW/ROP functions use the TAWS runway database and the current aircraft position and track. During final approach:
‐ The detection starts from 2 000 ft, then
‐ The ROW function arms at 400 ft.
The landing runway detection is continuously updated several times per second, including below
400 ft when the ROW function is armed.
The computation occurs in real time, the ROW and ROP functions consider:
‐ All landing weight and CG ranges (this includes overweight landing)
‐ Both landing configurations (CONF 3 and FULL)
‐ LDA
‐ Autopilot engagement
‐ All wind conditions
‐ Dry and wet runway conditions
‐ No failure that affects landing performance
‐ 15 % safety margin.
Runway Condition Selector
The flight crew uses the runway condition selector to set the runway condition to WET or DRY
The ND indicates the runway condition selected:
Alerts
If a risk of overrun is detected (computed landing distances are greater than the LDA) the ROW/ROP
triggers:
‐ Visual alert messages displayed on the PFDs
‐ Aural alert messages provided through loudspeakers.
ROW ARMING
At 400 ft AGL, the ROW function automatically arms.
ROW ACTIVATION
Below 400 ft, if the computation for landing distance is more than the LDA:
‐ The “RWY TOO SHORT” message is displayed on both PFDs.
This message flashes for 9 s and then remains steady.
This message is not associated to an aural alert.
Below 200 ft, if the computation for landing distance is more than the LDA:
‐ The “RWY TOO SHORT” message is displayed on both PFDs.
This message flashes for 9 s
and then remains steady. In addition, the following repetitive aural alert triggers: “RUNWAY
TOO SHORT”.
ROP ACTIVATION
On ground, the ROP function computes the braking distance for the current aircraft and runway
conditions.
If current braking performance is not sufficient to stop on LDA, it triggers visual and
aural alerts.
As soon as an overrun situation is detected “MAX BRAKING” and “MAX REVERSE” messages
are displayed on both PFDs.
They flash for 9 s and then remain steady
At the same time, the aural alert “BRAKE, MAX BRAKING, MAX BRAKING’’ is triggered and
continues until the system detects maximum manual brake pressure.
When the flight crew applies maximum manual brake pressure, the aural alert “SET MAX REVERSE” is triggered and continues until the system detects maximum reverse thrust.
Below 80 kt, the aural alert “KEEP MAX REVERSE” is triggered, if the system still detects overrun situation with maximum manual brake pressure and maximum reverse thrust.
If the overrun situation is no longer detected, alerts are no longer triggered.
ROW/ROP INHIBITION
The flight crew can use the ROW/ROP p/b to inhibit the ROW/ROP function.
In this case, the ROW and ROP functions are fully inhibited:
‐ No message displayed on the PFD
‐ No audio alert
‐ No runway condition displayed on the ND
‐ ROW/ROP runway condition selector inhibited.
In any case, the ROP function is inhibited when the ground speed decreases below 30 kt.
