NOTE: Clearances authorizing “direct” to a point on a previously issued route do not require the phrase “rest of route unchanged.” However, it must be understood where the previously cleared route is resumed. When necessary, “rest of route unchanged” may be used to clarify routing.
“Amend altitude. Cross Ollis intersection at or above Three Thousand; cross Gordonsville V-O-R at or above One Two Thousand; maintain Flight Level Two Four Zero.”
(Shortly after departure, altitude restrictions are no longer applicable, the controller issues an amended clearance as follows):
“Climb and maintain Flight Level Two Four Zero.”
“Climb via SID except maintain Flight Level Two Three Zero.”
“Cross Gordonsville VOR at One One Thousand. Then, reduce speed to Three Zero Zero.”
NOTE: The phrase “do the best you can” or comparable phrases are not valid substitutes for an amended clearance with altitude or speed restrictions.
NOTE: Air traffic control specialists retain the latitude necessary to tactically resolve conflicts. Every effort should be made to ensure the aircraft is returned to the original filed flight plan/altitude as soon as conditions warrant.