MOSCOW, November 6. /TASS/. Urgent improvement of Boeing-737 aircraft rudder control system is required, the Interstate Aviation Committee (IAC) said on Friday.

"Acts of the air register, just as the international air accident investigation commission, are based only on interests of flight safety and the need to comply with ICAO standards and international agreements in the field of aircraft airworthiness," IAC press service said. "There is a clear distinction between the authority of the IAC as an international organization and functions of Russia’s aviation and oversight agencies. IAC sphere of operations do not comprise issues of authorizing or prohibiting flights of Russian air carriers’ aircraft," the press service said.

TASS reported earlier the Interstate Aviation Committee said in its letter it suspends the certificate for all Boeing-737 aircraft in Russia until receiving a joint notice of the Russian Federal Air Transport Agency and the US Federal Aviation Administration on the aircraft airworthiness.