SAN ANTONIO -- A San Antonio aviation training facility has been shut down by the Federal Aviation Administration while it investigates allegations that the company certified thousands of mechanics who don't speak or read English, the international language for mechanics.

The investigation into Tobias Aerospace is affecting about 200 students, whose certifications have been held up because of the investigation.

"They tell me that both applications were denied," a student who didn't want to be identified said to KSAT 12 News.

FAA officials confirmed the investigation and said its goal is to ensure the safety of the flying public, including mechanics who can communicate in English.

"If a car breaks down, it's going to roll off on the side of the road. If an airplane breaks down, it crashes," the mechanic said of the importance of knowing English.