• Ideal for RVSM applications
• All-digital for unsurpassed accuracy and reliability
• Low power consumption
• Reduced weight and size for mounting close to pitot/static system
• Enhanced BITE for lower cost of ownership
• Highly reliable rugged solid-state piezoresistive sensor
• Designed for the latest EMI, HIRF and lightning requirements
• TSO'd to the latest FAA software standards
• ARINC 429 digital outputs

The ADS-3000 Air Data System senses, computes and displays all parameters associated with aircraft movement through the atmosphere. It meets the demanding performance requirements of high-performance business jets and regional aircraft. The ADS-3000 is capable of being certified to comply with the Reduced Vertical Separation Minimum (RVSM) requirements.

The system is totally digital from the Air Data Computer (ADC) to the air data displays on the Primary Flight Display (PFD) and Multifunction Display (MFD). The ADC-3000 provides ARINC 429 digital outputs for use by the AHS-3000 Attitude Heading Reference System, flight data recorders, navigation computers, altitude transponders, ground proximity warning systems and auxiliary aircraft subsystems.

The ADS-3000 comes from a long lineage of proven performance. The ADS-85/86/850 family of solid-state air data computers is certified on over a dozen different aircraft with more than 10,000 system deliveries. Before introducing the ADS-3000 family, Rockwell Collins sold more than 20,000 of the highly successful ADS-8X and ADC-85X systems. The ADS-3000 is standard equipment on many business, regional and air transport aircraft. The ADS brings air transport-class capabilities and accuracy to business aircraft.

The ADC-3000 uses a totally digital design approach. It digitizes pressure and temperature information from the sensors then digitally computes and transmits the data throughout the system.

Transmissions to other on-board systems are also digital. This unique digital design offers reduced size, weight and power consumption; continuous monitoring of all functions and internal diagnostics; increased system integrity and simplified installation.

The system can be tailored to fit specific customer requirements. The ADC receives pneumatic inputs from the pitot/static system and electrical signals from the aircraft outside temperature probe. It uses these to compute altitude, airspeed, Mach and temperature parameters. In turn, this information provides outputs for the flight control system, navigation system, aircraft control system and ATC transponder. The use of digital display instruments reduces the maze of pneumatic plumbing behind the instrument panel to only those lines needed for the standby instruments.

The Collins ADS far exceeds the FAA Technical Standard Order (TSO) accuracy requirements. In addition, when included with aircraft system efforts, the Collins ADS complies with RVSM requirements.

Features of the system include:

• Monitoring of all essential functions
• On-board fault isolation
• Solid-state piezoresistive pressure transducers
• Digital computational and display accuracy
• Solid-state synchronization circuits
• Low power consumption components
• Internal diagnostics and nonvolatile memory
• 28 V DC operation
• RVSM compliance

Computed and available parameters from the ADC-3000 are:

• Indicated airspeed/calibrated airspeed
• True airspeed
• Vertical speed
• Vmo/Mmo
• Static air temperature
• Total air temperature
• Pressure altitude (corrected for static source errors)
• Barometric corrected altitude⁽¹⁾
• Mach
• Total pressure
• Static pressure
• Impact pressure
• Internal Standard Atmosphere (ISA) Delta Temperature

⁽¹⁾ Requires external control to provide barometric pressure

The computer self-monitors the altitude and airspeed computation channels. An overspeed warning test function is also provided.

The sensor element itself is a tiny silicon chip with piezoresistive elements diffused into its surface. Pressure applied across the chip strains the piezoresistive elements and the resistance of each element changes. The sensor converts these changes to a digital signal which is then processed by a digital computer. The computer calculates the absolute static pressure and differential pressure between the static and pitot ports of the aircraft and converts them to familiar air data quantities such as altitude and airspeed. Collins piezoresistive sensors are highly accurate and reliable.