Aviation regulator DGCA has grounded 11 pilots and six cabin crew of GMR's aviation company for safety violations, virtually rendering its fleet non-operational, but the infrastructure major today refuted the charges.DGCA sources said that the unprecedented move came after the regulator's team found that several flights operated by GMR Aviation in the last month, including one on Monday when an aircraft flew Congress Vice President Rahul Gandhi to Bhubaneshwar, had skipped some mandatory tests.They said, tests like pre-flight breath analysis of pilots and cabin crew were skipped and the breath analyser was non-functional. Pre-flight breath analyser tests are mandatory for all flights boarded by the VIPs protected by the Special Protection Guard, SPG.In a statement, GMR Aviation strongly refuted the charges, saying no test has been skipped or data falsified. A company spokesperson said a written response would be shortly sent to the aviation regulator and hoped that the pilots and cabin crew would be reinstated soon.He said, the breathalyser was working perfectly except its printer. He said, no breath analyser test has been skipped or falsified by the crew or doctor.