Aircraft Digital Electronic and Computer Systems: by David Wyatt, Mike Tooley

By David Wyatt, Mike Tooley

The plane Engineering ideas and perform sequence offers scholars, apprentices and training aerospace pros with the definitive assets to develop their airplane engineering upkeep reviews and profession.

This e-book offers an creation to the rules of airplane electronic and digital structures. it truly is written for a person pursuing a occupation in plane upkeep engineering or a comparable aerospace engineering self-discipline, and particularly could be compatible for these learning for approved plane upkeep engineer prestige as a part of an EASA or FAR-147 licensed direction or taking Aerospace Engineering City & Guilds modules, EDEXCEL nationwide devices, EDEXCEL greater nationwide devices or a level in plane engineering.

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Extra resources for Aircraft Digital Electronic and Computer Systems: Principles, Operations, and Maintenance

Sample text

The ARINC 429 binary specification calls for the use of two’s complement notation to indicate negative numbers (see page 18) and this binary format is known as BNR. 13 the label (103) corresponds to Selected Airspeed and the indicated value is 268 knots (256 + 8 + 4). The zero in bit-29 position indicates a positive value and the data (presented in natural binary format) uses bit-28 (for the MSB) to bit-20 (for the LSB). The remaining bits are padded with zeros. 12 data conveys a value (this time expressed in BCD format) of 25786.

2. State the Boolean logic expression for the logic gate arrangement shown in Fig. 11. 3. Devise a logic gate arrangement that provides the output described by the truth table shown in Fig. 12. 5 Tri-state logic Tri-state logic devices operate in a similar manner to conventional logic gates but have a third, highimpedance output state. This high-impedance state permits the output of several tri-state devices to be connected directly together. Such arrangements are commonly used when a bus system has to be driven by several logic gates.

A low cost bus system for the simple avionics fitted to a small business aircraft. 2. Connecting a weather radar receiver to a radar display. 3. A bus system for linking the various avionics systems of a modern passenger aircraft to its flight data recorder (FDR).. 4. A bus system for the avionics of a military aircraft fitted with multiple radars and electronic counter measures (ECM). 4 Multiple choice questions 1. A bus that supports the transfer of data in both directions is referred to as: (a) universal (b) bidirectional (c) asynchronous.

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