Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Overcame Equipment Problem
Aircraft
During a ferry flight of aircraft due to #2 VHF radio failure; upon being vectored on a heading of 120 degrees to intercept the ILS at ZZZ we loss radio contact due to failure of #1 VHF radio. We maintained our assigned heading and altitude until ILS intercept and set the transponder to 7600. At 400 FT AGL we were able to contact the Tower briefly and received a landing clearance. Upon exiting the runway we attempted to contact Tower and Ground without success. We observed light gun Tower signals to cross the intersecting runway and to taxi to the ramp. The Captain contacted the Tower by phone to follow up. As we discovered upon and talking to the Tower by phone after landing; they  could hear us the entire time.
The pilots of a Challenger 300 experienced the apparent loss of the second VHF radio during a maintenance ferry flight for one radio failure. After landing the flight crew was advised that the Tower was receiving their transmissions; but they could not hear the Tower.