An Alternative Method for Identifying a Failed Engine in Twin-Engine Propeller Aircraft

2020 ◽  
Vol 10 (2) ◽  
pp. 103-111
Author(s):  
Andrey K. Babin ◽  
Andrew R. Dattel ◽  
Margaret F. Klemm

Abstract. Twin-engine propeller aircraft accidents occur due to mechanical reasons as well as human error, such as misidentifying a failed engine. This paper proposes a visual indicator as an alternative method to the dead leg–dead engine procedure to identify a failed engine. In total, 50 pilots without a multi-engine rating were randomly assigned to a traditional (dead leg–dead engine) or an alternative (visual indicator) group. Participants performed three takeoffs in a flight simulator with a simulated engine failure after rotation. Participants in the alternative group identified the failed engine faster than the traditional group. A visual indicator may improve pilot accuracy and performance during engine-out emergencies and is recommended as a possible alternative for twin-engine propeller aircraft.

2006 ◽  
Author(s):  
Sudip Basak

The environment prevalent in ocean necessitates the pile foundations supporting offshore structures to be designed against lateral cyclic loading initiated by wave action. Such quasi-static load reversal induces deterioration in the strength and stiffness of the soil-pile system introducing progressive reduction in the bearing capacity as well as settlement of the pile foundation. To understand the effect of lateral cyclic load on pile group, a new apparatus, consisting of mechanically and electrically controlled components, has been designed and fabricated. Each of the components of this apparatus is calibrated and a series of trial tests are performed for its performance study. This paper presents detailed description of the apparatus, calibration and operating principle of each of its components, the observations made from trial experiments and the relevant conclusions drawn therefrom.


1956 ◽  
Vol 29 (3) ◽  
pp. 852-856
Author(s):  
R. F. Blackwell

Abstract Hardness determinations are frequently required on very soft rubbers in the range of 5 to 30 (Shore). It is usual to make such measurements in the shop with a pocket-type tester; however this is not entirely satisfactory for laboratory work where a more precise reading is usually required, calling for a hardness tester of the dead-load type. Such a tester, moreover, is useful to keep a check on the accuracy of pocket testers. The British Standard dead-load hardness tester is not calibrated below 30° BS, but a method of extending the range downwards has been proposed, whereby the standard indentor of this tester is replaced by one of 0.25 inch diam.; unfortunately this method has the disadvantage of involving more than one revolution of the dial gauge needle, and a directly calibrated scale would be out of the question. There is, however, an alternative method in use at BRPRA, which gives hardness readings down to 4° in one revolution; and which replaces the standard added load of 535 grams by one of 70 grams. At present, a calibration curve is provided to convert from scale reading to hardness degrees, but it is intended to add a second scale in due course.


Sociobiology ◽  
2020 ◽  
Vol 67 (2) ◽  
pp. 201
Author(s):  
Francisco Jiménez-Carmona ◽  
Soledad Carpintero ◽  
Joaquín Luís Reyes-López

The ‘dehesas’ are important and vast agro-silvo-pastoral systems typical of the Iberian Peninsula that are undergoing a crisis due to their low economic profitability and environmental degradation. Thus, it is necessary to identify effective tools that provide a reliable idea of the status of these ecosystems as a starting point for future measures of conservation. In this study we analyse the possible role of ants as surrogates for epigeic arthropods, a common biodiversity indicator group. A total of 15 farms were sampled throughout Sierra Morena (Andalusia, Spain) with pitfall traps, both for the ‘dehesa’ habitats themselves and for different microhabitats within the study sites. First, we achieve a complete list of the species of ants of the area. The results indicate that the ‘dehesa’ habitats were very homogenous for all farms, while microhabitats showed differences in species richness and ant communities’ composition compared to the ‘dehesas’. To evaluate the role of ants as surrogates, the number of traps occupied by each order of arthropod and by each ant species was compared. We found a high correlation between them what confirm the surrogate character of ants for the rest of arthropods in these ecosystems.


2010 ◽  
Vol 20 (4) ◽  
pp. 441-460 ◽  
Author(s):  
RAVINDER KAUR

AbstractIn post-revolution Iran, the sacred notion of martyrdom has been transformed into a routine act of government – a moral sign of order and state sovereignty. Moving beyond the debates of the secularisation of the sacred and the making sacred of the secular, this article argues that the moment of sacralisation is realised through co-production within a social setting when the object of sacralisation is recognised as such by others. In contemporary Iran, however, the moment of sacralising bodies by the state is also the moment of its own subversion as the political-theological field of martyrdom is contested and challenged from within. This article traces the genealogy of martyrdom in contemporary Iran in order to explore its institutionalised forms and governmental practices. During the revolution, the Shi'a tradition of martyrdom and its dramatic performances of ritual mourning and self-sacrifice became central to the mass mobilisation against the monarchy. Once the revolutionary government came into existence, this sacred tradition was regulated to create ‘martyrs’ as a fixed category, in order to consolidate the legacy of the revolution. In this political theatre, the dead body is a site of transformation and performance upon which the original narrative of martyrdom takes place even as it displaces it and gives new meanings to the act.A CrashOn the morning of 6 December 2005, an Iranian military plane C-130 carrying journalists and Army officials crashed near Mehrabad airport in Tehran. The plane was attempting an emergency landing when it hit a ten-storey apartment block, setting off a big explosion which set fire to the building. In all, one hundred and sixteen charred bodies were recovered – ninty four passengers and twenty two residents of the building – from the smoke and rubble in this working class area of south-western Tehran. The residents were mostly women and schoolchildren who had stayed home – because of an official anti-pollution drive – to avoid a thick layer of smog that had developed over Tehran skies over the previous few days. Dozens of people were injured on the ground and the riot police had to be called in to clear the area of curious onlookers who were blocking the emergency services.The plane crash was met with grief, guilt and hints of anger. The Iranian media was most vocal in its expression of rage – seventy eight journalists had lost their lives in an instant. The ‘Iran News Daily’, a leading English language newspaper based in Tehran, two days later devoted a full page to the crash coverage including scathing editorials demanding accountability and answers to “disturbing questions” from the government. The editorial entitled ‘Duty and Responsibility’ stated that “condolences are not enough. People, the near and dear ones of victims in particular, have the right to know. Did the C-130 have technical problems? Was it fit for the passenger service? What would have really happened if the flight was cancelled? Who gave the final permission for the journey to go ahead? Is this another case of human error or engine failure? How can such major loss of innocent life be explained, leave [sic] alone justified?”2Similarly, Hossein Shariatmadari, influential editor of the conservative Persian daily ‘Kayhan’, called for a full investigation, not because it would bring “the dead back to life but (to) prevent repetition of similar incidents and further disasters”.3As private and public condolences began pouring in – newspapers had allocated prime space for such purpose – President Mahmoud Ahmadinejad sent a short message through state media that dramatically altered the narrative of grief and anger against the authorities. The message read as follows: “I learned of the catastrophe and the fact that members of the press have been martyred. I offer my condolences to the Supreme Leader and to the families of the victims”. With this message the dead journalists had been officially pronounced ‘martyrs’ – a moral-political subjectivity that traces its genealogy to the martyrdom of Imam Hussein.4In a single moment, the burnt corpses were no longer the bodies of ordinary victims of a plane crash, but the corpses of martyrs, and their charred remains sacrificial relics.


1999 ◽  
Vol 7 ◽  
pp. 45-50
Author(s):  
M.B. Blackwell ◽  
R.G. Keogh

An on-farm trial was carried out at Te Hana, in Northland, to measure milk production responses in 2 groups of 16 spring-calving, 3-year-old Holstein-Friesian cows maintained throughout the trial on pastures with or without the ryegrass endophyte toxins, ergovaline and lolitrem B. The trial began in October 1997, with second calving cows balanced for calving date and production worth. Milk volumes of all cows were recorded for 10 consecutive days each month followed by a herd test in which milk volume, protein, fat and lactose contents were determined from milk samples. There were no differences in milk volume or milk solids production in the October and November measurement periods. In December, the group grazing toxin-free (-Ev) pastures produced 24% more milk than the group grazing toxincontaining (+Ev) pastures. These differences increased progressively as the trial proceeded, until terminated in mid-April. Throughout the trial period the -Ev group produced 23% and 19% more milk and milk solids, respectively, than the +Ev group. A rise in levels of the endophyte toxins in ryegrass coincided with the start of differences in milking performance. A toxin-free maize based supplement was fed to both groups during the January to March period to maintain the trial when pasture growth was insufficient. A negative correlation was found between milk production of the +Ev group in January and the prevailing temperature and humidity conditions during the night. Keywords: endophyte toxins, ergovaline, lolitrem B, milk production, Neotyphodium, Northland, ryegrass


PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0247061
Author(s):  
Christophe Lounis ◽  
Vsevolod Peysakhovich ◽  
Mickaël Causse

During a flight, pilots must rigorously monitor their flight instruments since it is one of the critical activities that contribute to update their situation awareness. The monitoring is cognitively demanding, but is necessary for timely intervention in the event of a parameter deviation. Many studies have shown that a large part of commercial aviation accidents involved poor cockpit monitoring from the crew. Research in eye-tracking has developed numerous metrics to examine visual strategies in fields such as art viewing, sports, chess, reading, aviation, and space. In this article, we propose to use both basic and advanced eye metrics to study visual information acquisition, gaze dispersion, and gaze patterning among novices and pilots. The experiment involved a group of sixteen certified professional pilots and a group of sixteen novice during a manual landing task scenario performed in a flight simulator. The two groups landed three times with different levels of difficulty (manipulated via a double task paradigm). Compared to novices, professional pilots had a higher perceptual efficiency (more numerous and shorter dwells), a better distribution of attention, an ambient mode of visual attention, and more complex and elaborate visual scanning patterns. We classified pilot’s profiles (novices—experts) by machine learning based on Cosine KNN (K-Nearest Neighbors) using transition matrices. Several eye metrics were also sensitive to the landing difficulty. Our results can benefit the aviation domain by helping to assess the monitoring performance of the crews, improve initial and recurrent training and ultimately reduce incidents, and accidents due to human error.


Author(s):  
Beatrice Allegranti

Little is said about the process of loss and grieving as both corporeal and as a performative process. This chapter presents loss in a way that leads beyond the confines of discursive labels, diagnosis, and narrow views of human suffering, to an understanding of loss and grief as a performative, mutually entangled process between self, other, and the person ‘lost’. Building on previous research establishing links between psychotherapeutic and performance processes dealing with loss, this chapter explores the complexity of loss and grief as a corporeal process (biological, kinaesthetic, non-human) and discursive (psychological, sociopolitical) construction of bodies in motion. Drawing from personal experience of loss and dance-based research projects, the chapter suggests a possible corporeal reclaiming after loss: the dead can be in us, the living, and this (im)possible performative can contribute to feelings of wellbeing and transformation by providing a creative ongoing relationship with the person who has died.


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