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A-4 Aircraft Instruments Committee

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Standard

TACHOMETER INSTRUMENTS (Indicator and Generator)
2008-02-16
CURRENT
AS432B
This SAE Aerospace Standard (AS) covers tachometer instruments (RPM indicator, 0-110 percent RPM and 0-120 percent RPM indicators and generator) for remote indication of engine speed.
Standard

Numeral, Letter and Symbol Dimensions for Aircraft Instrument Displays
2008-02-16
HISTORICAL
AIR1093A
The purpose of this AIR is to provide recommendations for the minimum dimensions of characters and symbols used in aircraft instrument dials and panel displays as related to the conditions stated in para. 3. Numerous variables influence the legibility of aircraft instrument dial characters. This situation makes it very difficult, if not impossible, to establish an exact act of rules for optimizing all installations. Character size, one of the important considerations, can be optimized where adequate dial space exists. Usually this is not the case and the designer is faced with placing the information in a limited space while continuing to strive for error-free legibility. Appropriate minimum size requirements have been stated herein for guidance in air transport use.
Standard

Fuel Flowmeters
2008-02-16
HISTORICAL
AS407C
This Aeronautical Standard covers two basic types of instruments, or combinations thereof, intended for use in indicating fuel consumption of aircraft engines as follows: TYPE I - Measure rate of flow of fuel used. TYPE II - Totalize amount of fuel consumed or remaining.
Standard

Fuel and Oil Quantity Instruments
2008-02-16
HISTORICAL
AS405C
This Aeronautical Standard covers two basic types of instruments as follows: Type I - Float Instruments Type II - Capacitance Instruments
Standard

Automatic Pilots
2001-07-01
HISTORICAL
AS402B
This Aeronautical Standard covers Automatic Pilots intended for use on aircraft to automatically operate the aerodynamic controls to maintain flight and/or to provide maneuvering about the three axes through servo control.
Standard

Accelerometer Group, Counting (MS25447 and MS25448)
1999-07-01
HISTORICAL
AS22145
This specification covers the design and performance requirements for a single axis, four load-factor level counting accelerometer group referred to hereafter as “equipment.”
Standard

Indicator, Pressure, 1 1/2-Inch, Integrally Lighted
1999-05-01
HISTORICAL
AS23479
This specification covers design requirements and all performance requirements for the procurement of single and dual hermetically sealed, integrally lighted, remote indicating, pressure indicators.
Standard

Compass; Magnetic, Pilot’s Standby
1999-04-01
HISTORICAL
AS5604
This specification covers the design requirements and all performance requirements for procurement of 1 7/8 inch dial pilot’s standby compasses as specified herein.
Standard

PRESSURE ALTIMETER SYSTEMS
1996-10-29
HISTORICAL
AS8009A
This Aerospace Standard (AS) specifies minimum performance requirements for primary pressure altimeter systems other than air data computers. This AS 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.
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