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Multi-word visual and aural messages can be suf ciently explicit about the failure condition and do not leave the crew with the dif cult task of trying to decipher a single word lamp legend together with systems indications in a stressful situation. In fact modern display systems can tell the crew what the system failure is and what actions they should take to recover to a safe condition. This electronic ight reference can be used to replace the ight reference cards. Further information on warning systems can be found in Institution of Mechanical Engineers (1991) Seminar S969 on the Philosophy of Warning Systems [1].

Existing domain knowledge has been shown to be essential to learn from the Internet. However, this does not necessarily mean that less knowledgeable learners should not use the Internet, but rather that they may need assistance to be able to learn successfully. Learners may receive the help they need either prior to or during their interaction with the Internet.

Figure 8.3 M FD warning and display system (Courtesy of Smiths Group now GE Aviation)

Instructors may be able to provide learners with necessary skills and abilities prior to navigating the Internet that will make the learning process less challenging for novice learners. One way is to provide learners with a list of appropriate websites (Kafai & Bates, 1997). This would enable students to be exposed to quality information prior to their independent searches. If novices are not forced to make decisions regarding the information they will initially study, then they may be able to develop a knowledge base to successfully guide subsequent searches. Secondly, learners may benefit 263

Malinda Desjarlais, Teena Willoughby, and Eileen Wood from instruction prior to Internet use Mayer, Mathias, and Wetzell (2002) as well as Lawless, Schrader, and Mayall (2006), for example, demonstrated that learning may be enhanced if students develop an overview schema of the information prior to interacting with closed hypermedia Mayer and colleagues (2002) provided half the participants with a diagram of a braking system with the components labeled prior to observing a multimedia presentation detailing how brakes work The other half of the undergraduate students studied the multimedia presentation without viewing the pretraining material In comparison to novices who were not exposed to the pre-training, learners with little domain knowledge performed significantly better on post-test measures of learning Mayer et al (2002) suggested that the pre-training decreased the cognitive load associated with processing information in the multimedia presentation and thus allowed learners to obtain a deeper understanding of the material.

The occurrence of a re in an aircraft is an extremely serious event, since the structure is unlikely to remain sound in the continued presence of ame or hot gases. The most likely place for a re to start is the engine compartment. Fires may occur as a result of mechanical damage leading to the engine breaking up or overheating, from pipe or casing ruptures leading to the escape of hot gases which may impinge on the structure, or from escaping fuel coming into contact with hot surfaces. All the necessary ingredients for starting and maintaining a re are readily available plenty of fuel, plenty of air and hot surfaces. Needless to say, everything that can be done to prevent the escape of uids and to reduce the risk of re is done. Nevertheless it is prudent to install some means of detecting one and a means of extinguishing it. Detection systems are usually installed in bays where the main and auxiliary power-plants are located (Figure 8.4 and 8.5). The intention is to monitor the temperature of the bays and to warn the crew when a predetermined temperature has been exceeded. The system consists of a temperature measuring mechanism, either discrete or continuous, a control unit and a connection to the aircraft warning displays, as shown in Figure 8.5. The temperature detection mechanism is usually installed in different zones of the engine bay so that res can be localised to individual areas of the power-plant.

Similarly, Lawless et al (2006) assigned a group of undergraduate students with relatively low levels of domain knowledge to read a paper-based passage outlining the major topics in human genetics immediately before studying related information from a single website The remaining participants were not provided with prior scaffolding Learning outcomes were greatest for those who were exposed to the pre-training material before navigating the website Lawless and colleagues (2006) claimed that the passage increased learners knowledge about how the domain-related content on the Internet fit together; as a result, learners were more capable of managing the complexity of the environment Thus, prior exposure to quality material, even at a basic level, Internetmay facilitate learning when using the Internet It is not always feasible, however, for instructors to determine learners level of domain knowledge prior to each assignment, especially in college or university settings.

Discrete temperature sensors usually take the form of bi-metallic strips constructed so that a contact is made up to a certain temperature, when the strips part. A number of sensors are placed at strategic locations in the engine compartment, and wired to cause the contacts to open, then the control unit

Therefore, researchers have examined the impact of electronic and human assistance while learners are navigating the Internet..