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Pressure Altimeter Systems

A-4 Air Data Working Group
  • Aerospace Standard
  • AS8009C
  • Current
Published 2016-05-24 by SAE International in United States
This SAE Aerospace Standard (AS) specifies minimum performance requirements for pressure altimeter systems other than air data computers. This document covers altimeter systems that measure and display altitude as a function of atmospheric pressure. The pressure transducer may be contained within the instrument display case or located remotely. Requirements for air data computers are specified in AS8002. Some requirements for nontransducing servoed altitude indicators are included in AS791. This document does not address RVSM requirements because general RVSM requirements cannot be independently detailed at the component level. The instrument system specified herein does not include aircraft pressure lines. Unless otherwise specified, whenever the term “instrument” is used, it is to be understood to be the complete system of pressure transducer components, any auxiliary equipment, and display components. The test procedures specified herein apply specifically to mechanical type instruments. Solid state instruments or automatic test instrumentation may require other test procedures. Such differing procedures shall be justified prior to use.
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Minimum Performance Standard for Pitot and Pitot-Static Probes

A-4 Air Data Working Group
  • Aerospace Standard
  • AS8006A
  • Current
Published 2015-08-08 by SAE International in United States
This SAE Aerospace Standard (AS) covers the following basic types: Type I - Pitot pressure, straight and L-shaped, electrically heated. Type II - Pitot and static pressures, straight and L-shaped, electrically heated.
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STALL WARNING INSTRUMENT

A-4 Air Data Working Group
  • Aerospace Standard
  • AS403A
  • Current
Published 2008-02-16 by SAE International in United States
No Abstract Available.
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ALTIMETER, PRESSURE ACTUATED SENSITIVE TYPE

A-4 Air Data Working Group
  • Aerospace Standard
  • AS392C
  • Current
Published 2008-02-16 by SAE International in United States
This Aeronautical Standard covers two (2) basic types of instruments as follows: TYPE I - Range 35,000 feet. Barometric Pressure. Scale range at least 28.1 - 30.99 inches of mercury (946-1049 millibars). May include markers working in conjunction with the Barometric Pressure Scale to indicate pressure altitude. TYPE II- Range 50,000 feet. Barometric Pressure. Scale range at least 28.1 - 30.99 inches of mercury (946-1049 millibars). May include markers working in conjunction with the Barometric Pressure Scale to indicate pressure altitude.
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MINIMUM PERFORMANCE STANDARD FOR AUTOMATIC PRESSURE ALTITUDE REPORTING CODE GENERATING EQUIPMENT

A-4 Air Data Working Group
  • Aerospace Standard
  • AS8003
  • Current
Published 2008-02-16 by SAE International in United States
This Aerospace Standard covers all automatic pressure altitude code generating equipment manufactured under this standard and complying with the requirements specified herein up to the maximum range of pressure altitude as indicated on the equipment nameplate. In those cases where the code generating equipment forms part of an aircraft system, such as a pressure altimeter, an air data computer or an ATC Transponder, this standard applies only to the code generating equipment as defined in paragraph 1.2.
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MINIMUM SAFE PERFORMANCE OVER SPEED WARNING INSTRUMENTS

A-4 Air Data Working Group
  • Aerospace Standard
  • AS8007
  • Current
Published 2008-02-16 by SAE International in United States
This AS defines instruments which use inputs of static and pitot pressure equal to those which are utilized to establish the pressure altitude and speed of that aircraft. These pressures are applied to the instrument ports to provide means for generation of an aural warning whenever the aircraft reaches or exceeds the maximum operating limit speed. This Over Speed Warning Instrument function may be incorporated as part of an Air Data Computer, or an Air Speed Indicator, or an Air Speed/Mach Number Indicator, or other instruments. In those cases where the Over Speed Warning Instrument is part of another instrument, the standards contained herein apply only to the Over Speed Warning Instrument function. Each aircraft type and model has a defined maximum operating limit speed curve or curves which are a part of the airframe manufacturer's type certification approval data; this limit speed data shall be available from the subject airframe manufacturer as published in the operating manual for the aircraft type and model number and configuration.
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Pressure Altimeter Systems

A-4 Air Data Working Group
  • Aerospace Standard
  • AS8009B
  • Historical
Published 2005-09-21 by SAE International in United States
This SAE Aerospace Standard (AS) specifies minimum performance requirements for primary pressure altimeter systems other than air data computers. This document covers altimeter systems that measure and display altitude as a function of atmospheric pressure. The pressure transducer may be contained within the instrument display case or located remotely. Requirements for air data computers are specified in AS8002. Some requirements for nontransducing servoed altitude indicators are included in AS791. The instrument system specified herein does not include aircraft pressure lines. Unless otherwise specified, whenever the term “instrument” is used, it is to be understood to be the complete system of pressure transducer components, any auxiliary equipment, and display components. The test procedures specified herein apply specifically to analog type instruments. Digital instruments or automatic test instrumentation may require other test procedures. Such differing procedures shall be justified prior to use.
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Minimum Performance Standard for Mach Meters

A-4 Air Data Working Group
  • Aerospace Standard
  • AS8018A
  • Current
Published 1996-09-01 by SAE International in United States
This AS covers subsonic and supersonic Mach meter instruments which, when connected to sources of static (Ps), and total (Pt), or impact (Pt-Ps), pressure provide indication of Mach number. These instruments are known as Type A. This AS also covers servo-operated repeater or digital display instruments which indicate Mach number when connected to the appropriate electrical output of a Mach transducer of Air Data Computer. These instruments are known as Type B.
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VERTICAL VELOCITY INSTRUMENT (Rate-of-Climb)

A-4 Air Data Working Group
  • Aerospace Standard
  • AS8016A
  • Current
Published 1996-09-01 by SAE International in United States
This AS covers Vertical Velocity Instruments which display the rate of change of pressure altitude of an aircraft, as follows: Type A - Direct reading, self-contained, pressure actuated Type B - Electrically or electronically operated, self-contained, pressure actuated Type C - Electrically or electronically operated, input from a remote pressure sensor
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AIRSPEED INSTRUMENTS

A-4 Air Data Working Group
  • Aerospace Standard
  • AS8019A
  • Current
Published 1996-09-01 by SAE International in United States
This standard covers Airspeed Instruments which display airspeed of an aircraft, as follows:
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