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Communication and Navigation Products for the Business Aviation and Military Platforms

CESSNA 550 Citation II · Systems Description

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Overview

This document provides a comprehensive overview of the communication and navigation systems used in the Cessna 550 Citation II and related models. It details the various components, including audio management units, radio management units, VHF communication radios, navigation radios, and distance measuring equipment. The document is intended for pilots and maintenance personnel who need to understand the operational capabilities and configurations of the aircraft's avionics systems. Key features of the systems, such as the Primus II Integrated Radio Systems and their functionalities, are highlighted, along with installation specifics and operational guidelines.

  • The Cessna 550 Citation II utilizes the Primus II Integrated Radio System for navigation and communication.
  • The RM-855 Radio Management Unit is crucial for controlling radio functions and is required for ADS-B Out compliance.
  • The RNZ-851 Integrated Navigation Unit integrates multiple navigation modules into a single system.
  • The DI-851 DME Indicator displays essential navigation data, including distance and ground speed.
  • The Integrated Communication Unit supports advanced communication features like ACARS and Mode S transponder.

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Originally published by innovative-ss.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.

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Document details

Type
Systems Description
Pages
11
File size
3.2 MB
Publisher
innovative-ss.com
How rare is it?
4CESSNA 550 Citation II registered worldwide · 0 active

Common. Rarer than 12% of the aircraft models we track.

Documentation completeness
6/7

Most owners only have the POH. Here's the essential set for the CESSNA 550 Citation II.

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In this document

Audio Management Units

The audio management units in the Cessna 550 Citation II are designed to handle digitized audio from remote radio units. Typically, a dual system configuration is used, with one unit on the pilot's side and another on the copilot's side. Each panel allows for switching between various radio units and includes amplifiers for headphones and speakers.

Radio Management Units

The RM-855 Radio Management Unit serves as the primary interface for controlling the Primus II radio system. It features high-frequency tuning, backup tuning capabilities, and options for displaying navigation indicators. This unit is essential for compliance with ADS-B Out mandates.

Integrated Navigation Unit

The RNZ-851 Integrated Navigation Unit is a self-contained navigation system that includes modules for VHF NAV reception, DME, and ADF. It connects to a cluster module that digitizes audio and manages system cooling. This unit is integral to the aircraft's navigation capabilities.

Distance Measuring Equipment (DME) Indicator

The DI-851 DME Indicator provides auxiliary display of navigation information, including distance to navigational aids, ground speed, and time to the aid. It operates with one or two DME receivers and displays data on a dichroic LCD.

Communication Unit Features

The Integrated Communication Unit includes a VHF communication transceiver and a transponder module. It supports various features such as ACARS and Mode S transponder capabilities, ensuring comprehensive communication functionality.

Safety notes

  • Ensure compliance with ADS-B Out mandates when operating the aircraft.
  • Regularly check the functionality of audio management and radio management units to maintain communication integrity.

Full document text

Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information IS&S Communication and Navigation Products 1 Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information 1) Audio Management Units 2) Radio Management Units 3) VHF Communication Radios 4) Navigation Radios 5) Distance Measuring Equipment 6) Transponders Communication and Navigation Products for the Business Aviation and Military Platforms 1) Inertial Reference Units 2) Air Data and Inertial Reference Units Inertial Reference Products for the Air Transport and Military Platforms Enhance IS&S Capabilities with Communication, Navigation and Inertial Computer Technologies Product Acquisition from Honeywell Aerospace Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information • Product line includes PRIMUS II Integrated Radio Systems dual, remote-mounted digital radio system that encompasses all standard navigation and communication functions, including Very High Frequency Omnidirectional Range (VOR), DME, ILS, and Very High Frequency (VHF) communications. • Marker beacon and transponder (Mode A/C/S, depending on installation) • All control functions are operated from two RM-85X Radio Management Units (RMU). A CD-850 Clearance Delivery Control Head is also part of the system. Communication and Navigation Products Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information RM-855 Radio Management Unit The RM-855 RMU is a liquid crystal display unit primary interface used to control the Primus II radio system in the Primus 1000 and Primus 2000 flight decks. Key Benefits: • High frequency tuning, NAV Radio back up tuning, 3rd Com tuning • Switch COM radios from voice to data mode (when equipped) • Option to show a navigation radio magnetic indicator & engine backup display on the RMU • Upgrades are easier - software only • Required for ADS-B Out mandate The RM-855 Radio Management Unit (RMU) is mounted in the cockpit panel and is the primary interface used to control the radio system functions. Required for ADS-B Out Mandate on the following aircraft: • Bombardier Learjet 40 / 45 & 70/75 • Embraer Legacy 600 / 650 • Gulfstream PlaneView Cockpits G350 / 450 / 500 / 550 • Textron Cessna Citation VII, X, Model 560 (Ultra, Encore, Excel and XLS) • Textron Hawker 800 Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information AV-850 / AV-850A Digital Audio Panel • The AV-850 receives digitized audio from remote radio units. The digitized audio is provided through two high-speed digital audio buses. This is usually installed in a dual system configuration. • System No. 1 is on the pilot's or left side. System No. 2 is on the copilot's or right side. Up to six audio panels are installed in the aircraft on the high-speed digital audio buses. • Each audio panel contains hardware, which switches the microphones to various radio units. The audio panel also contains hardware for the interphones, cabin audio, and intercoms. Amplifiers are provided to drive the headphones and speakers. • The audio panel is a standard Dzus rail-mount package and uses electroluminescent panel lighting. • The audio control unit decodes the digital data, controls the gain (volume) of the various channels, adds the channels together, does various filter functions on the audio, and outputs the audio to a digital- to-analog converter. It contains hardware for switching microphones to various radios, for the interphones, and for the passenger cabin audio and intercoms. Amplifiers are supplied for driving headphones and speakers Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information • The CD-850 Clearance Delivery Control Head (CDH) is an alternate or emergency backup capability for tuning the No. 1 VHF COM Module and the No. 1 VHF NAV Receiver Module, on private line data buses that remain operational if the primary Radio System Bus (RSB) tuning is not available, or if the pilot/operator wishes to override the bus tuning for any reason. The CDH listens on the RSB and displays the active frequencies of these two modules. • The CDH is located on the center console in the cockpit of the aircraft between the RMUs, just forward of the engine power levers. • The CDH uses a translative, dichroic (black dye) LCD for enhanced readability and reliability. The panel lettering and buttons are internally lit using aviation blue—white lighting. • The CDH has strap options that select various features of the COM or VOR radios in the emergency mode. These features are set at the rear connector by jumper straps. • The normal and emergency modes are sub modes selected by the mode knob CD-850 Clearance Delivery Control Head (CDH) Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information • The RNZ-851 Integrated Navigation Unit is a complete, self-- contained navigation system. It contains the NV-850 VHF NAV Receiver, the DM- 850 DME, and the DF-850 ADF modules. Also, within the RNZ--851 is an XN-850 Cluster Module that supplies the interface with the NV--850, DM- 850, DF-850 and other units of the integrated radio system and digitizes the received audio for the digital audio system. Cooling is supplied by a noncritical, rack-mounted fan. Temperature sensors inside the individual modules report temperature rise to the cluster module, which switches the fan on and monitors its operation. When the temperature drop sufficiently, the fan is switched OFF.

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• Part of the Primus II Integrated Radio System contains the VOR, localizer, glideslope and marker scanning Distance Measurement Equipment (DME) module • Each module is self-contained within its own housing and connects to the cluster module through ribbon cable • A typical RNZ--85X Integrated Navigation Unit contains the modules that follow: o NV-850 NAV Receiver Module o DM-850 DME Interrogator Module o DF-850 ADF Receiver Module o XN-850 NAV Cluster Module (RSB and Digitized Audio Interface) RNZ-850/851 Primus II Radios Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information • The Integrated Communication Unit (COM Unit) is a complete, self- contained communication system. It contains the very high frequency (VHF) communication transceiver module, and either a transponder module or a traffic alert and collision avoidance system (TCAS) interface module. Also within the COM Unit is a communication (COM) cluster module that contains the circuitry necessary to handle all of the inputs and outputs of the COM unit modules and to place them on the digital audio bus and radio system bus (RSB). • The rear of the COM Unit has two antenna connections; one for the very high frequency (VHF) communication and the other for the transponder; and connectors for all electrical connections. FEATURES • VHF COM Features o 25 or 8.33 kHz channel spacing o ACARS • Transponder Features o ATCRBS o Mode S o TCAS Diversity o ARINC 429 o Enhanced Surveillance & Change 7 RCZ-833 Transponder VHF System Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information • The DI-851 Distance Measuring Equipment (DME) Indicator was designed and manufactured by BFG Flight Systems, Inc. per Honeywell Specifications. The DI-851 operates as an auxiliary display of DME Navigation information in the Honeywell Primus II SRZ-850 Integrated Radio System. • The DME related information includes the distance to a Navaid in nautical miles, the identification character string for the Navaid, the computed ground speed of the aircraft in knots, and the time to go to the Navaid in minutes. The indicator may be used with either one or two DME receivers and is capable of displaying data for both the active and preset channels of each DME. • The unit will also annunciate other information such as the Hold status for each channel and Microwave Landing System (MLS) DME activity. All data is input to the indicator from either the Primary or the Backup Radio System Bus (RSB). • The DME display consist of a dichroic Liquid Crystal Display (LCD) with white characters on a black background. The display contains two displayed quantities and the annunciators for these quantities. The left display is DME distance in nautical miles, and the right display is either the station identifier character string, ground speed in knots, or time to station in minutes. The LCD display, the legends on the two pushbuttons and the indicator identifier legend are backlit by an electroluminescent lamp. The backlighting intensity is controlled by the aircraft instrument dimming line. DI-851 DME Indicator Innovative Solutions & Support Proprietary Information Innovative Solutions & Support Proprietary Information Prime Family Platform Bombardier Challenger 300 Challenger 300 Bombardier Global Express Global Express/XRS Bombardier Learjet 31 Learjet 31 Bombardier Learjet 40 Learjet 40/40XR Bombardier Learjet 45 Learjet 45/45XR Cessna Citation II Citation Bravo (550B)/Cessna 550 Cessna Citation V Citation Encore (560) Cessna Citation Excel Citation Excel XLS (Primus) Cessna Citation I Citation I (Cessna 500) Cessna Citation II Citation II (Cessna 550) Cessna Citation III Citation III (Cessna 650) Cessna Citation Sovereign Citation Sovereign (Epic) Cessna Citation V Citation Ultra Cessna Citation V Citation V Cessna Citation III Citation VI Cessna Citation III Citation VII Cessna Citation X Citation X (Primus) Cessna CitationJet/M2 CJ1/CJ1+ (Cessna 525) Dassault Falcon 900 Falcon 900 Embraer Legacy 600 Legacy 600 Embraer Legacy 600 Legacy 650 Embraer Lineage 1000 Lineage 1000/E190 Fairchild-Dornier Envoy 3 Envoy 3 (Do-328 Jet) Hawker Beechcraft Hawker 1000 Hawker 1000 Hawker Beechcraft Hawker 4000 Hawker 4000/4000TS Hawker Beechcraft Hawker 800 Hawker 800XPi/850XP Syberjet SJ30-2 SJ30i Aircraft Platforms Communication and Navigation Products