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Man factor in aviation maintenance essay


In the flying industry, human being error is consider as being a major take into account most aviators accidents. Maintenance tasks which might be performed inaccurately or are overlooked by routine service crew could cause individual errors. Instances of human mistakes in routine service are installation of incorrect parts, essential checks not being performed and did not install wished parts. Among all aviation-related risks, errors created by maintenance staff are more hard to detect and possess the potential to remain dormant, impacting the secure operation of aircraft longer duration.

Though maintenance crews are responsible for actions, organization problems likewise contributed to the threat of maintenance problems. Since it is not possible to eliminate all routine service errors, presenting safety managing systems (SMS) to flying organizations will help identify risks and control risk.

Human being factors problems in aviators maintenance

Maintenance tasks could possibly be carried out in confined places, at heights, under burning up heat or in abnormally cold cold and worst coming from all, it is also intense.

Great communication, dexterity, clerical and focusing expertise are required to perform well from this environment. Problem analysis and rectification must be solved quickly in order to reduce turnaround time. In addition , there would be latent emotional stress on maintenance personnel whose function has been linked to aviation injuries.

However contrary to aircrafts, individuals do not have a set of educational manuals that helps us to know their overall performance and capacities. Each and every individual varies in lots of ways, hence one particular will never recognize how one routine service task related to errors. Aviation industries see many unstable accidents coming from human problems due to several contributing elements (Refer to find 1 for any graphical illustration on man error as opposed to contributing factors) (Takahiro S, Terry T, William Deb, 2008)and have taken steps to implement preventive or perhaps control measures. Factors contributing to human problems in routine service

Statistics show that 80 percent of mistakes are offered due to individual errors while the remaining percentage is due to physical or different failures. (Refer to Figure a couple of for a visual illustration about human mistake contribution percentile) (“Strategic program plan,  2007) There is also a breakdown demonstrating which type of maintenance activities having higher rate of human mistakes. (Refer to Table1, Consistency of Human error as opposed to Type of repair activity) (Goldman, 2002)

The Pear Unit

Four significant human elements of the Pear Model (Refer to Figure five for graphic illustration) happen to be: People who get the job done, environment in which they job, actions that they perform and resourcesnecessary to complete the job.


Human elements program give attention to people who perform the work and attend to physical, physiological, mental and psychosocial factors. Organization must concentrate on individuals, their physical features, mental state, intellectual size and circumstances which may affect theirinteraction with others. Factors just like each person ‘s size, grow older, eyesight, durability, endurance, experience, motivation and certification standards must be taken into account before eachperson is tasked to operate. Sufficient breaks and rest periods should be cateredto ensure eachperson is usually not overload. Organization should certainly encourage more teamwork and communicationsbetween acquaintances so that job accomplished will probably be safe and efficient. Giving educationalprograms on health and fitness can assist encourage good health and help reduce sick keep. Hence, a good human factors program can consider every one of the limitations of humans and styles thejob accordingly.


Physical workplace inside the hanger/shop and organization environment are environmentsthat are focused on man factors system. Conditions just like temperature, lighting, noise control, cleanliness, moisture and work environment design are considered physical environment. Cooperation, mutual respect, traditions of the organization, communication, command, shared goals and sharedvalues are important elements in an exceptional organizational environment.


The typical human factors approach to identify skills, understanding andattitudes toperform each activity in a given job is called Job Job Analysis (JTA). It helps to distinguish whatinstructions, tools and other solutions needed to execute each process. By following accurately to theJTA, each member of staff will be effectively trained and each workplace will even has the necessaryequipment and other resources to perform the job.


Solutions are seen from an extensive angle, such as anything that is required to get the jobaccomplished. Resources that are tangible are test gear, tools, take you, computers andtechnical manuals, and so forth. Amount of time provided, level of interaction among people ofdifferent levels, the amount and skills of personnel to complete a job are considered resourcesthat are less tangible. The main element under resources is to identify the importance foradditional solutions.

Accidents connected to maintenance

The japanese Airlines Air travel 123

In August 1985, The japanese Airlines air travel 123 believed the lives of 520 people mainly because it crashed right into a mountain. It had been bound for a short flight from Tokyo to Osaka but at the altitude of 24, 000ft, the airplane suddenly misplaced control because of the failure from the rear pressure bulkhead and caused the entire cabin to suffer a sudden decompression. The effect of the avoiding air caused the separating of the vertical stabilizer, rudder, hydraulic lines and four pressurized hydraulic devices. Investigations says the aeroplanes had experienced a end strike episode a few years in the past. The fix work done around the aft bulkhead did not abide by the ORIGINAL EQUIPMENT MANUFACTURING recommended procedure as two doubler dishes instead of a single plate were used to do the splice. (Refer to Figure several for an illustration in the repair)

Far eastern Airlines Airline flight 855

On May 5, 1983, Eastern Flight companies flight 855 was on the flight from Miami, U. S. to Nassau, Bahamas. The plane carried a total of 172 persons. While producing a come down, the low olive oil pressure alert indicator around the center engine lighted up. The air travel crew shut down the center engine and made a decision to return back to Miami with all the remaining two engines. On how back to New mexico, the aircraft’s low petrol pressure alert indicators pertaining to the remaining two engines lit up and then flamed away within minutes. Thankfully the airline flight crew was able to re-start the middle engine once again after the aeroplanes descended via 13, 000ft to four, 000ft without the power. Following your aircraft ended up safely in Miami airport terminal with 1 engine, simply no live loss or accidents were said.

The investigation board concluded the cause of the incident was due to all three magnetic chip detectors for the engines had been installed without O-rings (Refer to Figure 4 for a great illustration with the Chip) creating oil to leak through the engines during flight. This kind of accident could be avoided in case the engineers included were willpower and performed the maintenance tasks professionally.

English Airway Trip 5390

On 10 Summer 1990, United kingdom Airlines trip 5390 was on a air travel from Luton, England to Malaga, The country of spain. Suddenly around 17, 300ft, the kept windscreen on the captain’s part of the cockpit blew out from the cockpit. The captain was sucked away of his seat with half of his body chilling out of the planes and the partner resting around the flight handles. No lives were lost on this airline flight, but the chief suffered cold, bruising, andfractures to his right arm, left thumb and proper wrist while flight worker who assisted the chief suffered a dislocated glenohumeral joint, frostbitten deal with and some frostbite damage to his left vision. Investigators discovered that the repair manager whom worked on the windscreen experienced used inappropriate bolts during a windscreen restoration. Other problems highlighted had been failed to examine tolerance specification of the mounting bolts, staffing scarcity during nighttime shift, parts storage and involvement of supervisors in hands-on routine service work.

Security Management Devices

A safety management (SMS) is actually a systematic way to managing safety, plans, procedures, accountabilities, and such as necessary efficiency structures. The objective of a Safety Management is to provide a structured administration approach to control safety dangers in businesses. Therefore in order to have an effective protection management, the organisation’s particular structures and processes related to safety of operations should be taken into account. safety management requires planning, arranging, communicating and providing direction.

The first step of the SMS progession begins with setting the organisational safety policy. This lay outs the method for achieving satisfactory levels of safety within the organisation and specifies the principles where the TEXT MESSAGE is built and operated. To be able to mitigate and limit risk during functions in the designed processes, basic safety planning and execution of safety supervision procedures will be needed.

Just with these controls in position, quality administration techniques in that case can be used to ensure the planned objectives are met by deployment of safety peace of mind and if are unsuccessful, evaluation operations are had to provide continuous montioring of operations and for identifying regions of safety improvement. Furthermore, TEXT also offers the organisational construction to set up and encourage the introduction of a positive safety culture.

Finally, the implentation of TEXT MESSAGE provides the organisation’s management a structured set of tools to satisfy their respomsibilites for basic safety defined by the regulator.


Aviation industries have realized that it is not possible to entirely eliminate protection errors but for take a technique for identify, accurate and minimize the consequences of people errors. And with the implementation of SMS, hazards could be discover and risks could be control. In conclusion, these human element studies support aviation sectors to make continuous improvement and implementation of solutions to decrease maintenance mistakes.


Strategic program plan. (2007, August 01). Retrieved from http://libraryonline.erau.edu/online-full-text/human-factors-in-aviation-maintenance/StrategicProgramPlan.pdf Takahiro Suzuki, Terry L. Vonseiten Thaden, Bill D. Geibel. (2008). Impact of time pressure on airplane maintenance errors. Informally published manuscript, School of Illinois, Retrieved coming from http://www.aviation.illinois.edu/avimain/papers/research/pub_pdfs/miscconf/AAvPA_suzuki_final.pdf Micheal E. Maddox. (2007). Man factors. Daytona Beach, FL 32114: Embry-Riddle Aeronautical University. Retrieved via http://libraryonline.erau.edu/online-full-text/human-factors-in-aviation-maintenance/guide/chapter1.pdf LindaWerfelman. (2008, April). Working to the limit. AeroSafety World, 3(4), 14-18. Retrieved from http://flightsafety.org/aerosafety-world-magazine/past-issues/aerosafety-world-april-2008 Colin G. Drury. (2007). Establishing a human factors/ergonomics plan. Daytona Beach, FL 32114: Embry-Riddle Aeronautical University. Gathered from http://libraryonline.erau.edu/online-full-text/human-factors-in-aviation-maintenance/guide/chapter2.pdf Hobbs, A. Australian Transport Safety Bureau, (2008). An understanding of man factors in aviation repair (AR-2008-055). Retrieved from Australian Transport Protection Bureau web page: http://www.atsb.gov.au/media/27818/ar2008055.pdf

SKYbrary. (2013, Sept 14). Basic safety Management System. Retrieved from http://www.skybrary.aero/index.php/Safety_Management_System James Big t. Burnette. (2007). Workplace safety. Embry-Riddle Aeronautical University:

Daytona Seashore, FL 32114. Retrieved via http://libraryonline.erau.edu/online-full-text/human-factors-in-aviation-maintenance/guide/chapter3.pdf Micheal E. Maddox. (2007). Shiftwork and booking. Daytona Seashore, FL 32114: Embry-Riddle Aeronautical University. Retrieved from Micheal E. Maddox. (2007). Service design. Daytona Beach, FL 32114: Embry-Riddle Aeronautical University or college. Retrieved via http://libraryonline.erau.edu/online-full-text/human-factors-in-aviation-maintenance/guide/chapter5.pdf Adam Reason. (2007). Human problem. Daytona Seaside, FL 32114: Embry-Riddle Aeronautical University. Retrieved from http://libraryonline.erau.edu/online-full-text/human-factors-in-aviation-maintenance/guide/chapter14.pdf FAA. (2012). Human Factors. Retrieved from http://www.faa.gov/regulations_policies/handbooks_manuals/aircraft/media/AMT_Handbook_Addendum_Human_Factors.pdf Terrell N. Chandler. (2007). Schooling. Daytona Beach, FL 32114: Embry-Riddle Aeronautical University. Gathered from http://libraryonline.erau.edu/online-full-text/human-factors-in-aviation-maintenance/guide/chapter7.pdf

Figure 1 ) Human problem vs Contributing factors. (Takahiro S, Terry L, Bill D, 2008)

Figure 2 . Human problem contribution percentile. (“Strategic plan plan,  2007)

Table 1 . Frequency of Individual error as opposed to Type of routine service activity. (Goldman, 2002)

Figure 3. Comparison of the correct and incorrect method of the doubler plate repair. (Hobbs, 2008)

Figure some. Location of O jewelry on magnet chip metal detector. (Hobbs, 2008)

Figure five. The PEAR Model (FAA, 2012)


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