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Pressure Altimeter Systems
- Aerospace Standard
- AS8009C
- Reaffirmed
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
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.
Rationale
This standard was revised to: clarify some design requirements; update the environmental test requirements to include those of RTCA DO-160G; clarify some performance test requirements and to more closely align the equivalent metric test values with metric instrument markings. Special requirements for RVSM applications were not included because general RVSM requirements cannot be independently detailed at the component level. The intent is for this standard to replace AS392.
AS8009C has been reaffirmed to comply with the SAE Five-Year Review policy.
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Topic
Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| Table 1A | Leakage static pressure | |
| Table 1B | Leakage static pressure, SI units | |
| Table 2A | Scale and hysteresis ambient room temperature | |
| Table 2B | Scale and hysteresis ambient room temperature, SI units | |
| Table 3A | Different instrument orientation | |
| Table 3B | Different instrument orientation, SI units | |
| Table 4A | Barometric setting mechanism | |
| Table 4B | Barometric setting mechanism, SI units | |
| Table 5A | Stop and jump friction error | |
| Table 5B | Stop and jump friction error, SI units | |
| Table 6A | Static friction | |
| Table 6B | Static friction, SI units | |
| Table 7A | Minimum sensitivity threshold values | |
| Table 7B | Minimum sensitivity threshold values, SI units | |
| Table 9 | Cold temperature correction values | |
| Table 10 | AS8034B requirements for altimeters with electronic displays |
Issuing Committee
The A-4 Committee/Sub-Committees are responsible for mechanical, electromechanical and electronic cockpit instrumentation standards applicable to all civil aircraft, with emphasis on minimum performance standards intended for reference in the Federal Aviation Administration (FAA) Technical Standard Orders (TSO).
Reference
| Number | Title |
|---|---|
| AIR1075 | BAROMETRY FOR ALTIMETER CALIBRATION |
| AS791 | Remote Servoed Air Data Instruments for Subsonic Aircraft |
| AS8002 | This document is not part of the subscrption. |
| FAR 25 | This document is not part of the subscrption. |
| RTCA DO-160D | This document is not part of the subscrption. |
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