Aircraft Structural Components Questions and Answers

Assertion (A): Riveted joints have been entirely superseded by adhesive bonding in metal airframes.

Reason (R): Bonded joints avoid the stress concentration that a fastener hole introduces.

Select the correct answer from the options below.

Assertion (A): Aluminium alloy remains a common airframe material despite composites being lighter.

Reason (R): Aluminium is cheaper to form, join, inspect and repair.

Select the correct answer from the options below.

Assertion (A): An engine pylon is designed with a deliberate weak link.

Reason (R): In a severe overload the engine should separate cleanly rather than tear the wing open.

Select the correct answer from the options below.

Consider the following statements about semi-monocoque construction:

1. The skin carries shear and part of the direct stress.

2. Stringers and longerons carry the bulk of the bending.

3. The frames carry the fuselage bending moment.

Which of the statements given above is or are correct?

Consider the following statements about the wing box:

1. It carries the wing bending moment through the spar caps and skins.

2. It carries the wing torsion as a closed thin-walled section.

3. It plays no part in containing the fuel.

Which of the statements given above is or are correct?

Consider the following statements about cabin pressurisation loads:

1. The hoop stress is twice the longitudinal stress in a thin cylindrical shell.

2. The loading is cyclic, once per flight, and drives fuselage fatigue.

3. The rear pressure bulkhead carries no axial load.

Which of the statements given above is or are correct?

Consider the following statements about wing ribs:

1. They maintain the aerofoil section.

2. They divide the skin into shorter panels, raising its buckling stress.

3. They carry the spanwise bending moment of the wing.

Which of the statements given above is or are correct?

Consider the following statements about fail-safe design:

1. It provides an alternative load path if one member fails.

2. It relies on damage being found by inspection before the second path fails.

3. It removes the need for any scheduled inspection.

Which of the statements given above is or are correct?

Consider the following statements about a diagonal tension field web:

1. It is permitted to buckle in shear well below its ultimate load.

2. After buckling it carries load as inclined tension bands.

3. The flanges and uprights are unaffected by the post-buckled behaviour.

Which of the statements given above is or are correct?

Consider the following statements about aircraft materials and joints:

1. Aluminium alloys offer a good balance of specific strength, cost and repairability.

2. Riveted joints can be inspected and repaired fastener by fastener.

3. Bonded joints are always preferred because they are lighter.

Which of the statements given above is or are correct?