41 CFR 301-70.501: -70.501 Status of existing travel authorization after personal emergency or incapacitating illness or injury.

The agency should not continue using the existing travel authorization if the interrupted trip was authorized under a trip-by-trip authorization. If, when the employee's health has been restored, the agency decides that it is in the Government's interest to return the employee to the TDY location, such return is considered to be a new travel assignment at Government expense. An interrupted trip authorized under an open or limited open authorization may be continued without further authorization.