OSCAR YANKEE
The autopilot ATHR may not sort it out itself and could lead to more complications. Less than 20KT no inspection is required but crew must report it. The procedure mentioned in my earlier post is given in FCOM:
OVERSPEED PREVENTION
Ident.: PRO-ABN-10-00014874.0001001 / 08 FEB 13
Applicable to: ALL
A318/A319/A320/A321 FLEET PRO-ABN-10 P 11/20
FCOM ← D to E 06 MAR 14
OVERSPEED RECOVERY
Ident.: PRO-ABN-10-00014875.0001001 / 08 FEB 13
Applicable to: ALL
FCOM page F
QRH only gives the recovery procedure.
Abnormal emergency procedures ABN80.06A