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Air data unit
Air data unit
Meggitt Avionics' Air Data Unit (ADU) is designed to measure pitot and static pressures using solid-state pressure sensors. The data is output in ARINC 429 format as raw pressure data. The unit is compact, measuring 3.25 x 3.25 x 5.54 inches, and is recommended to be installed close to pitot/static ports to enhance performance and reduce installation costs.
Key Features
- Solid-state modular design
- ARINC 429 digital bus input/output
- High accuracy silicon sensors
- Flange or foot mounting options
Key Benefits
- Lightweight and robust
- Can be installed in any orientation
- Suitable for pressurized or un-pressurized areas
Performance Specifications
- Altitude Range: -2000 to 99000 ft with varying accuracy based on altitude
- Airspeed Range: 40 to 900 knots with accuracy improving at higher speeds
- Mach Number Range: 0.300 to 2.000 with high precision
Applications
The ADU is applicable in commercial and military transport, suitable for both fixed and variable wing aircraft. Key customers include BAE, Pilatus, Hawker Beechcraft, and Dassault.
Technical Specifications
- Size: 3 ATI x 5.54 inches long
- Weight: 1.76 lbs
- Power Supply: 28 VDC nominal, operating range 18 to 36 volts
- Power Consumption: 5W to 7.6W depending on temperature
- Environmental and Software Standards: DO 160C, DO 178B level B
- Case Color: Black or grey
Electrical Connector Pin Allocation
The document provides detailed pin allocation for electrical connectors, including reserved and active connections for ARINC 429 outputs and power supply.
Additional Notes
- Case conforms to ARINC 408 standards
- Maximum weight is 650g
- Finish is ALOCROM 1200 with black paint
- External mating connector is MIL-C-SERIES II-16-26SN
- Mounting orientation has no restrictions
- Recommended torque for pressure ports is 65 lb.in
Catalog excerpts
Air data > Air data unit (ADU) r Air data > Air data unit (ADU) Key features • All solid-state modular design • ARINC 429 input/output digital bus • High accuracy solid-state silicon sensors • Flange or foot mounting installation available (flange mounting illustrated) Meggitt Avionics air data (ADU) unit measures pitot and static pressures using two solid-state pressure sensors. The outputs from these are provided in ARINC 429 format as raw pressure data. Meggitt Avionics air data unit (ADU) LRU is housed in case size 3.25 x 3.25 x 5.54 inches (overall length including connectors). Location close to the pitot/static ports is recommended to enhance performance and provide the lowest cost installation by minimizing pneumatic pipe lengths. • Lightweight • Extremely robust • Installation in any orientation • This unit can be located in any part of the aircraft, in pressurized or un-pressurized areas of the airframe. MEGGiTT smart engineering for extreme environments
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Air data > Air data unit (ADU) Operating range Accuracy Sea level: Altitude information -2000 to 99000 ft ± 12 ft 20000 ft ± 20 ft Airspeed information Operating range 40 to 900 knots Accuracy 40 to 80 knots 2 knots 80 to 100 knots 1 knot 100 to 900 knots 0.5 knots Operating range; Accuracy: Mach number information 0.300 to 2.000 0.300 to 0.450 0.005 0.450 to 2.000 0.003 Applications Key customers BAE / Hawk variants, Pilatus, Hawker Beechcraft business jets, Dassault Case colour: Black or grey This data sheet is not a specification, and may be liable to change without notice...
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ELECTRICAL CONNECTOR PLUG _ COVER PLATE FACTORY TEST ONLY -IDENT LABELS 7/16—20—UNJF—3B THREADS FOR PITOT PRESSURE CONNECTOR IN ACCORDANCE WITH MS33649 9/16—18-UNJF—3B THREADS FOR STATIC PRESSURE CONNECTOR IN ACCORDANCE WITH MS33649. Electrical Connector Pin Allocation Specification is subject to change Wire Type NC NC NC NC NC NC NC SW NC NC STP Wire A STP Wire B STP Wire A STP Wire B NC STP Wire A NC STP Wire B NC NC NC NC NC NC STP Wire A STP Wire B Case 3ATI in accordance with ARINC 408. Max. Weight 650g (1.433lb). Finish, ALOCROM 1200 to DEF STD 03-18 part 1. Paint black to FED STD 595 tint...
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