"trial operation" is correct and can be used in written English.
You can use it when referring to a test run of a procedure or system to ensure it is working as intended. For example, "We are about to begin the trial operation of the new production lines."
It is observed in a case study that the railway settled significantly due to the cyclic train loading after a one-month trial operation.
Then, a trial operation for integration of the sections was successfully conducted to produce hydrogen of about 10 L/h for 8 hours.
Scotland Yard said that prior to this trial Operation Cotton had netted a number of convictions for drug-dealing and enabled police to seize large quantities of cocaine and cannabis.
The officers, who will be in full British uniform, will begin patrols on Monday, spending the first week in Magaluf before heading to San Antonio for another week in what is being described as a trial operation.
In order to demonstrate the performance of this numerical simulation, the calculated results are compared with the data recorded in the one-month trial operation and the reliability of the proposed numerical method is confirmed.
Innost's Bi-2223/Ag tapes are being used for producing China's first HTS power cable system (30 m, 3 phase, 35 kA/25 kA), which will be put into trial operation next year.
Thus was born Redline, which began trial operations in Rwanda in 2016.
Roche has said Genentech's research and early clinical trial operations will retain autonomy so the culture can be preserved.
The bride's father retired as the director of criminal trial operations at the State Supreme Court in the Bronx.
The formulation indicates that two trial masses place in different directions are required in the two trial operations for each balancing plane.
This formulation indicates that two trial masses in different directions are required in the two trial operations for each balancing plane.
