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Electronic Standby Instruments System. OASIS: Introduction. The OASIS is designed to serve as the secondary source of cockpit instrumentation and provides the following functions: Attitude Indicated Airspeed Barometric Corrected Altitude Slip/Skid - PowerPoint PPT Presentation
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OASIS: Introduction
The OASIS is designed to serve as the secondary source of cockpit instrumentation and provides the following functions:
• Attitude• Indicated Airspeed• Barometric Corrected Altitude• Slip/Skid• Heading (Optional, requires a magnetometer)
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OASIS: LRU’s/Modular Design
DU-1(Display Unit)
DU-2(Display Unit)
Optional
MSU(Magnetic Sensing
Unit) Optional
ASU(Aerosonic
Sensor Unit)
The OASIS modular designed allows installation flexibility by separating the display from the ASU
enhancing installation flexibility in congested cockpits
3
OASIS: Standard System and Options
Standard system includes:• ASU, 1ea.• DU, 1ea.
Enhanced system options:• Second DU• DU with NVS• ASU with internal standby battery• MSU for heading reference
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OASIS: System Block Diagram
AHRS
Aerosonic Sensor Unit
ASU
Attitude, Heading, Airspeed, Altitude Data
AHRS
POWERGROUND
Display UnitDU-2
(Optional)
CO-PILOT
Display Unit DU-1
PILOT
Power
MagneticSensing Unit
(Optional)
Power
PowerAHRS Data
HeadingData
Air Data Air Data
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OASIS: Display Features
Barometric Setting
Slip-Turn Indicator
Altimeter Tape
Magnified Altitude Window
Menu Select Keys
Heading Window
(optional)
Battery Status
Airspeed Tape
Magnified Airspeed Window
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OASIS: Part 27/29 Airspeed Window
Red
Yellow
Green VNE Power OFF
VNE power ON
VCAUTION
Min Airspeed Max Airspeed Color
0 VCAUTION Green
VCAUTION VNE Power ON Yellow
VNE Power ON Max Airspeed Value
Red
VNE Power OFF Red Cross-Hatched Line
8
OASIS: Display Unit
Features:• 4 inch diagonal screen• 3 inch ATI opening• Chassis depth: 1.35 inches• Bezel: 4 inches x 3 inches• Weight: .75 lbs• NVS compatible (Option)
The DU is installed on the instrument panel adjacent to the primary display or instruments and provides a secondary graphical display of all of critical, primary functions necessary for the continued safe flight and landing of an aircraft during a loss of primary instruments. The DU provides user interface for data entry and settings through a bezel keypad. The DU is directly connected to, and obtains power and sensor data from the remote mounted ASU.
10
OASIS: Aerosonic Sensor UnitThe ASU is a separate remote mounted LRU that provides power and sensor data to the DU. It’s connected to aircraft power and the pitot/static pneumatic lines. The ASU contains sensors required for the computation of Indicated Airspeed, Barometric Corrected Altitude, Attitude, Slip/Skid. Heading is available with the installation of an Aerosonic Remote Magnetometer. Power to the remote magnetometer is provided by the ASU. In addition the ASU has an optional internal battery that allows the OASIS to operate for a minimum of 1 hour without aircraft power.
Features:• Dimensions: 3 x 3 x 6.25 inches• Weight: 2 lbs• Power: 28 Vdc nominal, 14 watts max (2 displays, 1 ASU)• Internal standby battery (Option)
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OASIS: Specification/Certification
Operating Specification• Altitude: -1,500 to +55,000 ft.• Airspeed: 20 to 450 kts• Max roll/pitch rate: 200 deg/sec• Operating temperature
• DU: -20º to +55º C• ASU: -40º to +70º C
• Baro setting: 28.00 to 30.99 mb• Reliability: 10,000 hrs MTBF
Certification• Software: DO178B level B• Environmental: DO 160F (Helicopter and Fixed Wing)• FAA /EASA TSO
• TSO-C2d: Airspeed Instruments• TSO-C4c: Bank and Pitch Instruments• TSO-C6e: Direction Instrument, Magnetic• TSO-C10b: Altimeter, Pressure Actuated, Sensitive Type• TSO-C113: Airborne Multipurpose Electronic Displays• TSO-C3e: Turn and Slip Instruments• TSO-C46a Maximum Allowable Airspeed Indicators• TSO-C179 Rechargeable Lithium Cells and Lithium Batteries
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