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Standard

Total Temperature Measuring Instruments (Turbine powered Subsonic Aircraft)
2008-02-16
CURRENT
AS793A
This standard covers three basic types of total-temperature-measuring instruments used as a means of determining the total temperature developed by adiabatic heating of the air due to motion of the aircraft through the air. Type I - Flush-type total-temperature sensor Type II - Probe-type total-temperature sensor (electrically heated) Type III - probe-type total-temperature sensor (unheated)
Standard

TRUE MASS FUEL FLOW INSTRUMENTS
1962-02-01
HISTORICAL
AS431A
This Aerospace Standard covers three basic types of true mass flow indicating instruments. Each may consist of an indicator, transmitter and other auxiliary means such as a power supply or amplifier as required.
Standard

TRUE MASS FUEL FLOW INSTRUMENTS
2008-02-16
CURRENT
AS431B
This SAE Aerospace Standard (AS) covers three basic types of true mass flow indicating instruments. Each may consist of an indicator, transmitter and other auxiliary means such as a power supply or amplifier as required.
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

TACHOMETER INSTRUMENTS (INDICATOR AND GENERATOR)
1963-08-01
HISTORICAL
AS432A
This Aerospace Standard covers tachometer instruments (RPM indicator, 0–110 percent RPM and 0–120 percent RPM indicators and generator) for remote indication of engine speed.
Standard

Stall Warning Instrument (Turbine Powered Subsonic Aircraft)
2008-02-16
CURRENT
AS439A
This standard covers stall warning instruments to provide positive warning to the pilot of an impending stall. Stall, as defined for the purpose of this standard, is the minimum steady flight speed at which the airplane is controllable.
Standard

Single-Degree-of-Freedom Spring-Restrained Rate Gyros
2008-02-16
CURRENT
AS1104
This specification covers that gyroscopic instrument normally defined as a "subminiature rate gyro." The rate gyro, when subjected to an angular rate about its input axis, provides an AC output voltage proportional to the angular rate. The subminiature size category generally includes gyro instruments of one (1) inch diameter or less and three and one-half (3 1/2) inches length or less. This specification defines the requirements for a subminiature spring-restrained, single-degree-of-freedom rate gyro for aircraft, missile, and spacecraft applications.
Standard

SYNCHROS
2008-02-16
CURRENT
ARP461B
This document is limited to units meeting the definitions of para. 1.3 and covers the following general class of synchros:
Standard

STALL WARNING INSTRUMENT (Turbine Powered Subsonic Aircraft)
1991-05-01
HISTORICAL
AS439
This standard covers stall warning instruments to provide positive warning to the pilot of an impending stall. Stall, as defined for the purpose of this standard, is the minimum steady flight speed at which the airplane is controllable.
Standard

Pressure Ratio Instruments
2008-02-16
CURRENT
ARP427A
This Aeronautical Recommended Practice covers two types of two unit Pressure Ratio Instruments each of which consist of a Transducer and an Indicator. The Transducer computes the ratio of two pressures and converts this ratio to a synchro electrical signal which is transmitted to the Indicator.
Standard

PRESSURE RATIO INSTRUMENTS
1991-05-01
HISTORICAL
ARP427
This Aeronautical Recommended Practice covers two types of two unit Pressure Ratio Instruments each of which consist of a Transducer and an Indicator. The Transducer computes the ratio of two pressures and converts this ratio to a synchro electrical signal which is transmitted to the Indicator.
Standard

PRECISION MOTOR TACHOMETER GENERATOR
2008-02-16
CURRENT
ARP667
This recommended practice establishes objectives for high performance control motor tachometer generators to be used with aeronautical and associated equipment in protective enclosures or completely within the shell of the aircraft so that they are subjected only to the internal climatic conditions of heat, cold, shock, vibration, and humidity. Control motor tachometer generators larger than size 23 are not covered in this document.
Standard

Overspeed Warning Instrument (Turbine Powered Subsonic Aircraft)
2008-02-16
CURRENT
ARP435
This ARP covers an electro-mechanical pneumatic device which is calibrated to provide control contacts that can be made to operate a warning device whenever the indicated airspeed (IAS) reaches a maximum value as defined by the operating limit speed curve for the specific model aircraft.
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.
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