AC-SYS MC
Multiple choice Fragen zu AC-SYS 3. Semester
Multiple choice Fragen zu AC-SYS 3. Semester
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The shear load on the wing of an aircraft with wing installed engines is maximum
A Fail-Safe structure:
The stroke of an oleo shock absorber depends on:
Brittle materials:
The endurance limit is defined as
To stop fluid from flowing back from the accumulators to the main system in case of a pump failure, hydraulic circuits are fitted with
What type of pump is commonly used in aircraft hydraulic systems?
Which of the following are primary flight controls?
The MCDU is the input device for
What happens in the dilution zone of the combustor?
In the dilution zone the combustion gases are mixed with fresh air to reduce the turbine inlet temperature.
What happens in the secondary zone of the combustor?
In the secondary zone, more air is introduced to complete the combustion process and reduce noxious emissions.
Which aerodynamic loads acting on the wing are dependent of airspeed and why?
The torsion load and the drag forces acting on the wing increase with the square of the airspeed.
Which aerodynamic loads acting on the wing are independent of airspeed, and why?
Wing bending and shear depend only on aircraft mass and load factor
What is the difference between a failure and a failure condition?
A failure is the inability of a system, subsystem or component of perform a function as intended. A failure condition is a condition with an effect on an aircraft and its occupants caused by one or more failures, considering the relevant operational and environmental conditions.
Name at least three possible ways to achieve a risk mitigation.
change design to eliminate hazard/ install safety devices/ install warning devices/ implement special training and procedures
Give a concise but complete definition of the term “system”
A system is an organized assembly of mutually interdependent elements (equipment, facilities, materials, software, services, personnel, procedures...), working together to perform a useful function. The elements are affected by being in the system and are changed as they leave it, i.e. the whole is greater than the sum of the parts.
What are aircraft airworthiness regulations?
Aircraft airworthiness regulations define the minimum standards for flight qualities, performance, design concepts, structural strength, reliability and safety that an aircraft must meet to achieve type certification.
What are the main differences between a major and a hazardous failure condition?
A major failure condition can cause some reduction in safety margins, increased workload for the crew and physical distress to passengers. A hazardous failure condition can cause large reduction in safety margins, physical
distress to the crew and serious or fatal injuries to passengers.
Name at least three processes or tools applied during the safety assessment of an aircraft system:
Functional Hazard Analysis (FHA)/ System Safety Analysis (SSA)/ Common Cause Analysis (CCA)/ Fault Tree Analysis (FTA)
What is the difference between the fail-safe and fault tolerant design concepts?
In a fail-safe design, a failure condition will cause no (or minimum) harm to other parts and systems or danger to personnel. In a fault, tolerant design, the system can continue operating in the event of the failure of one or more of its components. A fault tolerant system is in principle also fail-safe, but not all fail-safe systems are fault tolerant.
A minor aircraft system failure
A major aircraft system failure
The wing chordwise pressure distribution defines
In load analysis, the system of reference for the equilibrium of loads is
The ultimate stress:
Gust loads can be reduced by design if
The diameter of an oleo shock absorber depends on:
A constant speed propeller operates at the minimum pitch angle
In a tension test to measure elasticity and strength of a material, the yield stress is
Gust loads can be reduced by design if
The shock absorbing efficiency of a spring type landing gear is typically
In which conditions does a constant speed propeller have the max. efficiency?
Across the stator of an axial compressor stage
In a turbofan, the total pressure at the fan outlet is approximately
In a combustion chamber, the total pressure
Across a turbine stage (stator and rotor)
The exhaust nozzle of a civil turbofan engine is
Across the rotor of an axial compressor stage
In a civil turbofan engine, the fan thrust is approximately
In the impeller of a centrifugal compressor,
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Flashcards
Give a concise but complete definition of the term “system”
A system is an organized assembly of mutually interdependent elements (equipment, facilities, materials, software, services, personnel, procedures...), working together to perform a useful function. The elements are affected by being in the system and are changed as they leave it, i.e. the whole is greater than the sum of the parts.
What are aircraft airworthiness regulations?
Aircraft airworthiness regulations define the minimum standards for flight qualities, performance, design concepts, structural strength, reliability and safety that an aircraft must meet to achieve type certification.
What are the main differences between a major and a hazardous failure condition?
A major failure condition can cause some reduction in safety margins, increased workload for the crew and physical distress to passengers. A hazardous failure condition can cause large reduction in safety margins, physical
distress to the crew and serious or fatal injuries to passengers.
Name at least three processes or tools applied during the safety assessment of an aircraft system:
Functional Hazard Analysis (FHA)/ System Safety Analysis (SSA)/ Common Cause Analysis (CCA)/ Fault Tree Analysis (FTA)
What is the difference between the fail-safe and fault tolerant design concepts?
In a fail-safe design, a failure condition will cause no (or minimum) harm to other parts and systems or danger to personnel. In a fault, tolerant design, the system can continue operating in the event of the failure of one or more of its components. A fault tolerant system is in principle also fail-safe, but not all fail-safe systems are fault tolerant.
