(822-0730-334) RADIO TUNING UNIT / RTU-4220
- Digital Radio Tuning Unit
- ADS-B CompatibleÂ
- 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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