Results
Q1. What is the purpose of the wing main spar?
Correct answer is – To withstand bending and torsional loads
Q2. What is the purpose of wing ribs?
Correct answer is – To shape the wing and support the skin
Q3. What is the purpose of stringers?
Correct answer is – To prevent buckling and bending by supporting and stiffening the skin
Q4. The airframe structure must remain substantially intact after experiencing:
Correct answer is – the design limit load times a 1.5 factor of safety
Q5. In the construction of airframes the primary purpose of frames or formers is to:
Correct answer is – oppose hoop stresses and provide shape and form to the fuselage
Q6. How can wing bending moments be reduced in flight?
Correct answer is – By using aileron ‘up-float’ and using the fuel in the wings last
Q7. Regarding a safe life structure:1. will only fail after a known number of operations or hours of use. 2. should not fail until a predicted number of fatigue cycles has been achieved. 3. has a programmed inspection cycle to detect and rectify faults. 4. is changed before its predicted life is reached.
Correct answer is – 2, 3 and 4 apply
Q8. A fail-safe structure: 1. has a programmed inspection cycle to detect and rectify faults. 2. is changed before its predicted life is reached. 3. has redundant strength which will tolerate a certain amount of structural damage. 4. is secondary structure of no structural significance.
Correct answer is – 1 and 3 apply
Q9. The skin of a modern pressurized aircraft:
Correct answer is – is primary load bearing structure carrying much of the structural loads
Q10. The primary purpose of the fuselage is to:
Correct answer is – house the crew and payload
Q11. Station numbers (Stn) and water lines (WL) are:
Correct answer is – a means of locating airframe structure and components
Q12. Flight deck windows are constructed from:
Correct answer is – strengthened glass with shock absorbing clear vinyl interlayers and rubber pressure seals
Q13. A cantilever wing:
Correct answer is – is supported at one end only with no external bracing
Q14. A torsion box:
Correct answer is – is a structure formed between the wing spars, skin and ribs to resist bending and twisting loads
Q15. A lightening hole in a rib:
Correct answer is – lightens and stiffens the structure
Q16. Control surface flutter:
Correct answer is – is a destructive vibration that must be damped out within the flight envelope
Q17. Control surface flutter is minimized by:
Correct answer is – mass balance of the control surface
Q18. A damage tolerant structure:
Correct answer is – has degree of structural strength redundancy spread over a large area
Q19. Aircraft structures consists mainly of:
Correct answer is – aluminium alloy sheets and rivets with titanium or steel materials at points requiring high strength
Q20. The Maximum Zero Fuel Mass (MZFM) of an aircraft is:
Correct answer is – the maximum permissible mass of an aircraft with no usable fuel
