Hi hawk37,
You're partly right. Older certified aircraft may well have a generic correction to apply for wet runway operation to comply with the relatively recent requirement. Newer aircraft will have Wet Runway charts which are separate to the Dry Runway charts.
A point to not be confused with, for Dry Runway operation it is mandatory that a RESERVE means of stopping be available. (Don't confuse RESERVE with REVERSE). As Reverse Thrust is the least effective means of stopping, the manufacturer typically chooses Reverse Thrust as the RESERVE means of stopping. If no RESERVE means of stopping are available, a 15% penalty applies to the Accelerate-Stop distance.
A point often missed is that if Reverse Thrust is INOP for Dry Runway operations, a 15% ASDA penalty does apply, even though Reverse is not considered during Dry Runway certification. VERY OFTEN MISSED!!
Regards,
Old Smokey