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Routine maintenance was performed on equipment and instruments in the laboratory while time allowed . Additionally , in some situations , a system – such as lab equipment with an integrated PC – might be maintained by the equipment supplier who only applies patches during routine maintenance visits . Additional programs for use in trouble-shooting and routine maintenance have been included in the QNX software . Operator will make every effort to schedule routine maintenance so that its firm delivery obligations under Rate Schedule FPS-1 , FPS-2 and FPS-3 can be met during the Withdrawal Season . Each time routine maintenance was performed , the ground crews had to remove the tapes and caulks , then reapply them and let them cure before returning the aircraft to operational status . The routine maintenance consists of changes such as grammar , spelling , and format and includes Change Requests ( described later ) of a routine nature.The second type of maintenance that occurs is an urgent change .