The sensors can wrongly detect dust and other aerosols as smoke particles. Since the aircraft crew has no way to visually verify the presence of a fire, any alarm has to be treated as a real fire. If the aircraft is in flight, the pilots need to discharge on-board extinguishing equipment, declare emergency priority over other traffic, and land the aircraft at the nearest airport. If a false alarm goes off before takeoff, the aircraft must return to the gate and takeoff is delayed until mechanics can solve the problem. These procedures followed to handle the false 'fire alarm' result in considerable loss of time and fuel.
Hence current research in this field is geared towards developing systems which are false-alarm-free. Contemporary research activities also explore the use of multiple sensors and computer aided signal analysis and video camera aided fire and smoke indication.
Along these lines, the NASA Glenn Research Center has developed a multi-sensor package to read in a wider variety of fire emissions instead of just smoke. The detector looks for higher concentration of combustion gases along with the smoke, thus developing a more diverse file picture for the sensors. These file pictures with varying gas concentrations and smoke particle sizes are then compared by the multi-sensor package against the values that are characteristic of an actual fire. NASA Glenn also uses MicroElectroMechanical Systems (MEMS) chemical sensors with this new fire detection concept in response to the significant number of false alarms generated by the current fire detectors used on aircraft. The MEMS sensor system consists of miniaturized carbon monoxide and carbon dioxide sensors, a smoke particle detector, and integrated software. It also has a processor that measures the response of the complete sensor system and signals if there was an actual fire. The resultant system is effective in recognizing the presence of fires while screening out false alarms. Tests conducted by NASA indicate the feasibility of the multi-sensor system. Improvements can still be made to the sensors, the packaging and the software interface, the durability and drill effects of the sensors. The system also needs to be compliant with the FAA certification criteria. (i)
The B737-200 Freighter uses the Securaplane ST 3000 Fire Detection System which detects fire that originates in the lower cargo compartments of the aircraft. Radio communication links are used instead of wiring between the different limits of the system; this minimizes the quantity of wiring required, decreases the system weight and increases reliability.
The system has nine smoke detectors (four in the forward cargo and five in the aft cargo compartments) mounted in the ceiling of each lower cargo compartment, one central control unit (CCU) located in the aft wall of the forward cargo compartment with a configuration module (CM), one control display unit (CDU) on P-5 overhead panel, two circuit breakers at P-18 panel and associated wiring.
The System satisfies the FAA required Class "D" to Class "E" cargo conversion. The System can detect smoke anywhere within any cargo compartment within one minute at at-least two SDU locations. (ii)
Fire extinguishing systems:
The US Patent
Automatic fire detection systems can detect fires which may not be detected by aircraft crew until controlling the fire becomes difficult, or even impossible. Current fire detectors use either photoelectric or ionization sensor to detect the smoke particles produced by a fire…
A City Ablaze: Chicago and the Great Fire of 1871 There are not many people in the country of the United States of America that have not heard of the city of Chicago, Illinois. Indeed, it boasts many honors, including the fact that forty million people visit it annually to take advantage of all that it has to offer, from its famous deep-dish pizza to museums and galleries (City of Chicago).
Strategic management analysis involves evaluation of a firm within the contexts of internal and external environmental conditions with a view to accessing its competitiveness and positioning in the market (Hill and Jones, 2007). Such an analysis helps to establish the corporate and business strategy that a given company is pursuing.
Such an analysis helps to establish the corporate and business strategy that a given company is pursuing.
Boeing 777 business development under Philip Condit is a clear demonstration of a well thought strategic management analysis
ver 1,000 people including Buck Jones, a famous American movie star were having dinner in the restaurant when a busboy was instructed to fix a light bulb at around 10.15PM. The fire was caught apparently from a match lit by the busboy in an attempt to find the bulb. The fire was
From this paper, it is clear that Marx’s social conflict theory is at work almost from the beginning of the book, as Harry has gold galleons to spend on souvenirs at the Quidditch World Cup, while Ron has struggled for months to save a few Knuts. The true application of Marx’s social conflict theory begins with the children’s meeting with Winky.
e, the primary aspect of the design to qualify the airworthiness test is to be made up of the materials which do not become affected by the operational environment of the aircraft (‘Aircraft’, 1990). The variability of the material used, continuous loading, static strength,
The author describes that there was one body at the left wing of the aircraft and another body at the tail end of the aircraft. Body 1, was found near the mid of the accident and from the appearance, it was believed to be a male aged 30-40 years old. He was wearing a black trouser and a white striped shirt.
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