4dogs,
Airplanes that have been certificated to the equivilat of the post March 1998 FAR 25 include the Airbus A319, A321, A330, A340, Boeing 737-600, 737-700 and 737-800. The resised part 25 included the wet runway information.
Under the FARs the wet runway info is not back dated, under the JARs it is through the operating regs. The JARs also take into account an aircraft line up allowance, the FAR do not.
In short the variables considered for wet runway takeoff data include ground speed, tire pressure, tire tread, runway surface texture, and depth of water on the runway. Unlike the old days, the calculated values must be backed up with flight tests.
Reverse thrust can be used in determining takeoff data, the screen at the end of the runway is lowered to from 35 to 15 feet. The wet runway requirements are said to add a typical 220 feet to the takeoff roll, the brake requirements an additional 150 feet, and the pilot reaction time requirements an additional 150 feet.
I will email you a report of which the last few pages summaries the FAA and JAA position on this issue.
Z
[ 13 July 2001: Message edited by: Zeke ]