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(822-0730-334) RADIO TUNING UNIT / RTU-4220

  • Digital Radio Tuning Unit
  • ADS-B Compatible 
  • Centralized control for all radios
  • Active Matrix Liquid Crystal Display (AMLCD)
  • Consistent tune & mode selection operation of all radios
  • Extended frequency ranges and spacing for international operation
  • Full cross-side radio control capability
  • No loss of radio tuning due to a single RTU failure
  • Independent volume control for each radio
  • TCAS control
  • COMM, NAV, ADF & HF presets
  • Standby HSI display
  • Standby engine display (application dependent)
  • Real-time display of system interface, fault history & radio diagnostic codes
  • Built-in-test capability
  • Logical, intuitive menu structure minimizes pilot workload; only preset frequency programming resides beyond second level menu operation
  • Operates concurrently with both Commercial Standard Data Bus (CSDB) and ARINC 429 digital interface
  • Can act as a bilingual translator, formatting FMS ARINC 429 commands for a CSDB radio
  • Provides maintenance display pages for CNS system interface status, radio diagnostics and fault history records – available only to maintenance personnel
  • LCD Dimming Control & Panel Dimming Control
  • All versions of the RTU may be DZUS rail or panel mounted
  • In a Typical System: 2 RTU’s are required to provide the necessary redundancy in a typical installation, however a single RTU can provide full control of the entire radio complement
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