Airbus Iridium SATCOM System165E5733-00 L-3 Aviation Recorders ProprietaryIssue, Rev. 0221 January 2014Page 364. INSTALLATION CONSIDERATIONSThis section provides information on the installation considerations for each of the Airbus IridiumSATCOM System components.4.1 Satellite Data Unit (SDU)The SDU is housed in an ARINC 600 2MCU enclosure, which is designed to be mounted in astandard ARINC 600 mounting tray. Figure 4-1 shows a typical ARINC 600 2MCU tray used for theSDU.Figure 4-1 – 2MCU Mounting TrayWhile the SDU does not require forced-air cooling, every attempt should be made to place the SDU ina benign and well-ventilated environment. Placing the SDU on a plenum shelf in the Electronics Bayof the aircraft and using a mounting tray that provides cooling air to the SDU is preferred.The SDU tray should be electrically bonded to the airframe (<20 milliohms). It is recommended thatthe SDU be located where easy front panel access is available to facilitate replacing the flash card orconnecting to the Maintenance Port.
