Runway Overrun Warning (ROW)/Runway overrun Protection (ROP)
ROW/ROP SELECTOR SWITCH- A NEW ADDITION TO
AIRBUS NEO COCKPIT:
The introduction of a ROW/ROP selector
switch is called ROPS step 2+ function. It is an upgrade to the existing Runway
Overrun Warning (ROW)/Runway overrun Protection (ROP) function on A320 Family
NEO aircraft and it allows the Pilot to select the actual runway condition (DRY
or WET) before landing.
The advantages of having this new ROW/ROP
selector are that:
1)
It enables the pilot to inform the system about the available runway conditions
(DRY/WET)
2)The visual and aural alerts provided are
optimised than earlier
3) More parameters are considered for
Landing distance computation and selection made is indicated on ND. Improving
the safety margin.
ROW function gets armed automatically at
400 feet AGL and continuously computes the braking distance depending on the
selection (DRY/WET) plus other parameters and compare them with the LDA
(landing distance available) until start of the braking action. LDA is computed
using the GPS Position and the Runway length information from TAWS. On board
computers such as FAC’s, FMGC’s, EGPWS, MMR are responsible for this function.
ROP function gets activated from start of
braking until aircraft stops.
If a risk of overrun is detected (computed
landing distances are more than the LDA) the ROW/ROP triggers: ‐ Visual alert
messages displayed on the PFDs ‐ Aural alert messages provided through
loudspeakers.
ROW predicts the overrun and alerts the
pilot well in-advance so that Pilot will have the option to initiate Go-Around.
ROP alerts the pilot to consider Maximum braking/ Max reverse if overrun is
detected after touchdown.