Originally Posted by
ELAC
It's a percentage. Per the MEL it would apply equally to distances calculated on wet or dry runways. In the TransAsia accident Airbus provided calculations for an exhaustive variety of combinations of thrust, braking, spoiler deployment and runway condition. All the numbers can be found in the accident report.
ELAC
PS - The specific value (e.g. 1.15) seems to vary a bit depending on mod status. For a previous carrier's A330's I found numbers of 1.15, 1.18 and 1.2 applying to different aircraft in the fleet.
ELAC,
FYI the TAM landing performance chart below for SBSP 35L/A320-233/V2527E-A5 engines WET CONF FULL shows no landing distance penalty for inoperative spoilers in nil wind or headwind.
Last wind given to the crew from the TWR was 330°/8kts, landing was on 35L, CONF FULL, Gear Down, MED Autobrake, autopilot disconnected at 370' RA, FD/ATR ON. The approach speed was 145 kt, CM1 was PF.
CM1, 54 years old, 14,744 hrs flight time, 2,236 hrs on the A320, last rating test May 19, 2007. CM2 52 years old, 14,486 hrs flight time, 258 hrs on the A320, last rating test June 5, 2007.
