Flap retraction
Yip... In the Old threeholer we used to retarct flaps to25 after landing:
a) To put more wight on the wheels and improve braking
b) To reduce FOD on the flaps from flying stuff from wheels. Those flaps hang really close to the rwy surface when in the 40 position. Flying from unimproved fields could really cause wear on flaps and associated equipment.
On the "Whale LE devices retract when reverse is selected mainly to reduce FOD to LE device drive mechanism and wing anti-ice ducting etc, as these are uncovered when LE's are extended.
JJ