Narrative:

Captain and I flew company ETOPS B767-300 from ZZZ-ZZZ1. I was the pilot flying and the approach; landing; roll out; and taxi-in all seemed normal for ZZZ1. If the leading edge (left/east) slat failed during any of the flying phases; it would have been hard to detect without an aural warning and EICAS due to the usual adverse roll and pitch issues (gusty; variable winds) associated with an approach into ZZZ1. We exited runway X and taxied back to the gate area; crossing runway Y; staying in contact with tower the entire time (she activated 121.9 ground at that time; but told us to stay with her.) I retracted the slats/flaps after leaving the runway and completed the after landing checklist. Captain fuel-chopped the left engine taxiing in and we parked; shut down; completed all checklists and paperwork; then exited the aircraft. I was not aware that there was an issue with the left/east slat until the next day. At no time during our approach; landing; roll out; taxi in; and shut down was there any aural warning as to a left/east slat disagree. Amber EICAS messages to that effect never occurred and if they came on after the left engine was fuel-chopped; may have been lost in the normal shutdown messages.without an aural and visual warning and without the left/east slat protection system preventing extension or retraction with a damaged slat; there is no way we could have known about the damaged slat or even taken any action. If the protection and warning systems failed in flight with a damaged slat; the end result could have been much worse if the weather was marginal or if the crew was less experienced. Even if the slat and warning and protection system failure occurred on the ground; this raises serious safety concerns on my part about the reliably of the flap safety systems on our B767's. I am not sure when the ground crew noticed the damaged slat. It was well after we left. Why is unknown. That is the part that concerns me. Maintenance is ongoing. Hard to suggest anything at this time because there are too many unknowns.

Related reports:

Google
 

Original NASA ASRS Text

Title: A day after landing a B767-300 ETOPS aircraft; a First Officer was informed the #3 Leading Edge Slat was found damaged; canted sideways; and not fully retracted.

Narrative: Captain and I flew company ETOPS B767-300 from ZZZ-ZZZ1. I was the pilot flying and the approach; landing; roll out; and taxi-in all seemed normal for ZZZ1. If the Leading Edge (L/E) Slat failed during any of the flying phases; it would have been hard to detect without an aural warning and EICAS due to the usual adverse roll and pitch issues (gusty; variable winds) associated with an approach into ZZZ1. We exited Runway X and taxied back to the gate area; crossing Runway Y; staying in contact with Tower the entire time (she activated 121.9 Ground at that time; but told us to stay with her.) I retracted the slats/flaps after leaving the runway and completed the After Landing Checklist. Captain fuel-chopped the left engine taxiing in and we parked; shut down; completed all checklists and paperwork; then exited the aircraft. I was not aware that there was an issue with the L/E Slat until the next day. At no time during our approach; landing; roll out; taxi in; and shut down was there any aural warning as to a L/E Slat Disagree. Amber EICAS messages to that effect never occurred and if they came on after the left engine was fuel-chopped; may have been lost in the normal shutdown messages.Without an aural and visual warning and without the L/E Slat Protection System preventing extension or retraction with a damaged slat; there is no way we could have known about the damaged slat or even taken any action. If the Protection and Warning Systems failed in flight with a damaged slat; the end result could have been much worse if the weather was marginal or if the crew was less experienced. Even if the slat and warning and protection system failure occurred on the ground; this raises serious safety concerns on my part about the reliably of the flap safety systems on our B767's. I am not sure when the Ground crew noticed the damaged slat. It was well after we left. Why is unknown. That is the part that concerns me. Maintenance is ongoing. Hard to suggest anything at this time because there are too many unknowns.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.