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However, the expense of overhauling an engine after a major failure is considerable It therefore makes sound economic sense to monitor key engine parameters and forestall the problem by removing the engine for overhaul when certain critical exceedances have been attained The ability to monitor the consumption of component life may be used to modify the way in which the helicopter is operated or maintained If it is apparent that operating the aircraft in a certain way consumes component life in an excessive manner then the pilots may be instructed to modify the ight envelope to avoid the ight condition responsible From a maintenance standpoint it may be possible to extend the life of certain components if more information is available regarding true degradation or wear.

Of course, it is worth noting how few American schools offer Japanese as a language or provide any real opportunity for kids to dig this deeply into Asian culture These informal learning communities, in fact, are teaching kids things that most adults would see as valuable but which they can t learn in schools..

Those having a direct responsibility for designing indexes, anyone coding SQL statements as queries or as part of application programs, and those who are responsible for maintaining the relational data and the relational environment will all bene t to a varying degree if they feel some responsibility for the performance effects of what they are doing Finally, a word regarding the background that would be appropriate to the readers of this book A knowledge of SQL, the relational language, is assumed; fortunately this knowledge can easily be obtained from the wealth of material available today A general understanding of computer systems will probably already be in place if one is even considering a book such as this Other than that, perhaps the most important quality that would help the reader would be a natural curiosity and interest in how things work and a desire to want to do things better.

Videogames have the potential to be powerful educational tools. These games can teach both specific content and skills that are beneficial, and also exert more general positive effects on those who play them. Schools, the military, and other industries and organizations have already successfully utilized videogames as teaching tools, but there is the potential for much greater benefit to be derived from videogames. Unintended effects. Playing videogames can have various positive effects on an individual. These effects are, in many cases, unintended by those who design and those who play these videogames. One such general skill that videogames have proven effective in teaching is hand eye coordination. People who play videogames are better able to pay attention to cues across the visual field and can attend to a greater number of cues, compared to 72

In some cases it may be possible to dispense with a rigid component li ng policy and replace units in a more intelligent way based upon component condition..

How and What Do Videogames Teach those who do not play videogames (Green & Bavelier, 2003) Although such advantages in coordination may not be important in most real-world contexts, one study recently found that surgeons who had experience in playing videogames were faster at performing laparascopic surgeries and also made fewer mistakes (Rosser, Lynch, Haskamp, Yalif, Gentile, & Giammaria, 2004) Laparascopic surgery is a less invasive method of operation, in which surgical devices are controlled by keypads and joysticks while progress is viewed on a monitor The finding that videogames experience is related to better performance at specific skills, such as surgical techniques, suggests that deliberate efforts to improve performance in these areas through videogames could prove successful Another positive effect that videogames have is increasing children s positive attitudes towards computers and computer use.

The parameters which may be monitored are extensive and may depend to some degree upon the precise engine/gearbox/rotor con guration. Listed below is a range of typical parameters together with the reason for their use: Speed probes and tachometer generators: the measurement of speed is of importance to ensure that a rotating component does not exceed limits with the risk of being over-stressed Temperature measurement: the exceedance of temperature limits or a tendency to run hot is often a prelude to a major component or system failure Pressure measurement: a tendency to over-pressure or low pressure may be an indication of impending failure or a loss of vital system uids Acceleration: higher acceleration readings than normal may indicate that a component has been over-stressed or that abnormal wear is occurring. The use of low-cycle fatigue algorithms may indicate blade fatigue which could result in blade failure Particle detection: metal particle detection may indicate higher than normal metal contamination in an engine or gearbox oil system resulting from abnormal or excessive wear of a bearing which could fail if left unchecked Most HUMS systems continuously monitor and log the above mentioned parameters and would only indicate to the pilot when an exceedance had occurred. The data accumulated is regularly downloaded from the aircraft using a data transfer unit. The data is then transferred to a ground-based computer and replay facility which performs the necessary data reduction and performance/trend algorithms, as well as providing a means of displaying the data. In this way it is possible to maintain a record of every helicopter in the eet and to take the necessary actions when any exceedances or unhealthy trends have been identi ed. Astridge and Roe (1984) describes the health and usage monitoring system of the Westland 30 helicopter [7].