Air Force. Military Airlift Command. ff The wind speed in knots at the specified level. For the range of 100 to 199 knots, ... is coded for dd and the actual speed minus 200 is coded for ff and the group 00200 is inserted following the Oddff group.
|Title||:||Military Air Transport Service Manual|
|Author||:||United States. Air Force. Military Airlift Command|