VICE LETTER MOS MOS MOS MOS MOS 28-APR-2006 2606:18 AFL 626 ARINC EUROPEAN VHF FREQUENCY CHANGE. SERVICE LETTER MOS UNCOMMANDED CHANGE OF VHF COMMUNICATIONS FREQUENCY, SERVICE LETTER MOS PASSENGER ADDRESS (PA) POPPING/CRACKLING SOUND. SERVICE LETTER MOS VHF NUMBER TWO ANTENNA CONNECTORS DISCONNECTING. SERVICE L