The phrase "are operational at" is correct and usable in written English.
It can be used to indicate that something is functioning or active at a specific location or time.
Example: "The emergency services are operational at the designated response center."
Alternatives: "are active at" or "are functioning at".
After three years of operation the detector performance is excellent: 96% of the pixels are operational at 3500 e threshold, with noise, occupancy and efficiency better than the design specifications.
Guardian Australia confirmed that all runways are operational at Sydney airport.
London has around 2,200 officers authorised to carry firearms, but not all are operational at the same time.
In a sign of the pressure still on the industry, only Anne and Victoria are operational at present, but it is clear the steelworkers take great pride in what they do.
The Sindhurakshak is one of 10 Russian-made Kilo-class submarines that India has as part of its front-line maritime defenses, but only six of India's submarines are operational at any given time — far fewer than are needed to protect the nation's vast coastline.
Understanding the detailed components of rice root growth, in terms of cell differentiation, anatomy, ion fluxes, and hydraulic conductance requires phenotyping systems that are operational at a finer scale in addition to those characterizing whole root-system architecture.
In the VLIW mode, eight of the function units can be operational at the same time, whereby up to eight operations can be executed in parallel.
"We are going to make every effort to determine if these were operational at the time of the accident," Ms. Carmody said.
But no Libyan sub patrols had been reported since 1984, and none may have been operational at the time of America's airstrike.
The first B-1B flew in 1984, and by 1988 four wings totaling 100 bombers were operational at bases in the continental United States.
When told last Fall that the Patriots would not be operational, at least at first, Deputy Defense Minister Komorowski angrily responded that Poland expected to receive operational Patriot missiles, "not potted plants".
