This set of Aircraft Design Multiple Choice Questions & Answers (MCQs) focuses on “Configuration Layout – Maintainability Considerations”.
1. What is Maintainability?
a) The ease with which the aircraft can be fixed
b) The ease with which the aircraft can sustain damage
c) Vulnerability
d) RCS detection
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Explanation: Maintainability is defined as the ease with which the aircraft can be repaired or fixed. Vulnerability is related to damage taken. RCS detection is nothing but radar detection.
2. R&M are measured in?
a) Maintenance and research
b) Vulnerable area
c) RCS of system
d) Maintenance man-hours per flight hour
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Explanation: Reliability and maintainability or R&M are often used together. It is measured in Maintenance man-hours per flight hour (MMH/FH). MMH/FH varies with the type of aircraft. For small aircraft, it is typically less than 1.
3. What is the Major Key parameter of maintainability?
a) RCS
b) Survival
c) Accessibility
d) Vulnerability
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Explanation: Maintainability will be affected by accessibility. Survival is characteristic of vulnerability consideration. RCS is a term used in radar detection. Vulnerability is based on combat damage.
4. Which of the following is correct?
a) Avionics systems should be not accessible at all
b) Large doors should be provided for the avionics system
c) Accessible parts cannot be considered maintainability
d) Lift is always same as weight during ground maintenance
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Explanation: Large should be provided for avionics system as this would allow maintenance engineer to reach there with ease. Accessibility of parts is one of the major requirement and factor which affect overall maintainability of the aircraft.
5. Best access should be given to components which require often maintenance.
a) True
b) False
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Explanation: Accessibility is defined as the required effort done in order to reach a particular component. It shows whether the component is easily reachable or not. Hence, if a component requires often maintenance then, we should provide best access to that component.
6. Engine access doors should be such that?
a) They don’t allow maintenance at all
b) Only tiny part of engine is exposed during maintenance
c) They allow most of the engine to be exposed for maintenance
d) No provision is made for them; we need to dissemble the whole engine
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Explanation: Engine doors should be such that they allow most of the engine to get exposed during maintenance. This will reduce the effort of removing other components. Therefore, it will improve maintainability considerations of the engine.
7. Which of the following can be considered as the worst feature of an aircraft in terms of maintainability?
a) More accessibility is provided for components
b) Easily reachable parts
c) Easily accessible parts
d) Requirements of removing number of major structural elements
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Explanation: Easily accessible and reachable parts are primary requirement of maintainability considerations. Accessibility directly affects the effort and maintainability of an aircraft. If a design requires removal of major structural elements to access the component then, it is considered as the worst design based on maintainability.
8. What is the goal of preventive maintenance?
a) To increase breakdowns of critical equipment
b) To reduce breakdowns of critical equipment
c) Increase equipment failure
d) Not to provide maintenance at a given period of time
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Explanation: Maintenance can be divided into different types. Preventive is one of the type of maintenance. It is done with the goal of reducing critical equipment breakdown. It is done periodically and very well planned.
9. What is corrective maintenance?
a) Maintenance of equipment after failure or break down
b) Maintenance before break down
c) Pre break down maintenance
d) Scheduled maintenance
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Explanation: Corrective maintenance is done after breakdown or failure. Maintenance done before breakdown is called preventive maintenance. Scheduled maintenance is similar to preventive.
10. What is preventive maintenance?
a) Not a valid type of maintenance
b) Unscheduled maintenance
c) Same as corrective maintenance
d) Maintenance done before breakdown of component
View Answer
Explanation: When maintenance is done at given pre-defined period of time, before breakdown then it is called preventive maintenance. It has goal to reduce breakdown of components. Unscheduled is not done at pre-defined time.
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