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detects the change in resistance of the series wiring and causes a warning to illuminate in the cockpit. An alternative method is a continuous loop of tubular steel coaxial sensor which can be routed around the engine bay. This sensor changes its physical and electrical characteristics when subjected to heat. This change of characteristic is sensed by a control unit which causes a warning to light (Figure 8.6). The Graviner FIREWIRE sensing element is a slim stainless-steel tube with a centrally located coaxial wire surrounded by a temperature-sensitive, semiconductive material. This material has a negative temperature coef cient of resistance. The resistance measured between the centre wire and the outer sheath decreases with temperature, and is accompanied by a corresponding increase in capacitance. The resistance and capacitance of a loop is monitored continuously by a control unit. The control unit will provide a warning signal when the resistance reaches a predetermined value, as long as the capacitance is suf ciently high. Monitoring both parameters in this way reduces the potential for false recognition of res resulting from damage or moisture contamination of the element. The Kidde CFD system uses a ceramic-like thermistor surrounding two electrical conductors. The thermistor material has a high resistance at normal ambient temperature which reduces rapidly as the sensor is heated. A control unit senses the resistance and signals a warning when the value drops below a preset condition.

Less knowledgeable learners also may demonstrate learning benefits if they work with peers while interacting with the Internet. Lazonder (2005) found that college students who searched for and retrieved information from the Internet were able to answer a greater number of the assigned questions successfully, as well as correct wrong answers more often, when they completed the searches with a partner rather than alone. According to Lazonder (2005), when working in pairs, students must come to a consensus regarding the relevance of the material found on the Internet for answering the question at hand. It might be expected that less knowledgeable learners would exhibit the best results when they have the assistance of more knowl264

Figure 8.6 Construction of continuous rewire system (Courtesy of Kidde-Graviner) Both discrete and continuous systems work as detectors of overheating or re, but both are susceptible to damage by the very condition they are monitoring. The re or jet of hot gas the leads to the temperature rise can easily burn through the wiring or the sensor. The system must be designed so that if this does occur, then the warning is not extinguished. Equally the system must be designed so that no warnings are given when there is no re. Both these conditions are dangerous. The rst because the crew may think that a re has been extinguished, the second because a system which continually gives spurious warnings may be disregarded when a real re occurs. Once a re warning is observed a formal drill is initiated by the crew to extinguish it (the re). This will include shutting down the engine and isolating the fuel system at the engine re wall by closing a cock in the fuel system, and then discharging extinguisher uid into the bay. This is done by pressing a switch in the cockpit (often a switch built into the re warning lamp) which res a cartridge built into a bottle containing a uid such as BromoChloro-diFluoro-methane (BCF). This causes a spray of uid to be directed into the engine bay. Usually the bottles are single shot. If,

Domain Knowledge and the Internet edgeable peers to find the correct answer on the Internet In this study, however, this hypothesis was not explicitly tested Winters, Azevedo and Levin (2004) investigated the learning gains of heterogeneous ability pairs High school students with little domain knowledge were partnered with more knowledgeable peers to solve three science problems by retrieving information from a closed hypermedia program Identical pre- and post-test measures of knowledge were compared for learning gains More knowledgeable students did not experience any differences in their level of knowledge following the task However, less knowledgeable students did exhibit significant improved scores on the post-test By primarily questioning their partner about the material, the novice learners were able to increase their understanding (Winters et al, 2004).

after discharging the bottle, the re warning remains, the crew must decide if the warning is genuine. In a commercial aircraft this can be done by looking out of a window to see if ames can be seen in the engine nacelle, in a military aircraft by asking another aircraft to observe from behind. If a re is con rmed then the aircraft must be landed as soon as possible or abandoned. It should be noted that chloro uorocarbons (CFC) endanger the ozone layer and are the subject of much debate calling for a limitation in their use. This has resulted in the development of new uids for re extinguishing, although some legacy aircraft may still contain CFC based uids.