System Design, Loads, Stresses, Maintenance Flashcards
“Elastic deformation” in relation to aircraft structures is a shape change that……
Is temporary and is reversed after the force is removed
How might a pilot ensure the structural integrity of the aircraft?
Check the maintenance documents
Which of these statements about structural design principles are correct ?
- Fail-safe implies multiple load paths
- Safe life is the preferred design technique for aircraft
1) is correct
2) is incorrect
Fail safe = multiple load paths
Safe life = only one load path
In a hard-time maintenance programme, a component must be replaced…..
At a specified number of flight cycles or hours
A general visual indicator of corrosion that a pilot could detect during a pre flight-inspection is/are….
White spots on bare aluminium surfaces
During a pre flight inspection, what should a pilot pay particular attention to ?
A crack in the wing spar
What is the type of operation with the highest risk of corrosion ?
Low-level flights over warm salty water
Which of the following are visual identifiers of corrosion which a pilot must be able to identify during a pre-flight inspection ?
1.Powdering
2.paint discolouration
3.Rust
4.Etching
5.Pitting
6.cracking
7.Flaking
All of the above
Which of the following aircraft categories fall under CS-23 ?
1)normal
2)utility
3)ultralights
4)aerobatic
5)commuter aeroplanes
6)small helicopters
1,2,4,5
On which type of drag does airframe ageing have the greatest influence on?
Skin friction drag
What is “limit load” of an aircraft ?
It should be the maximum load expected during flight and the aircraft should be capable of withstanding 150% of it
During a turn with high bank angle an no altitude change, what will an aircraft experiences ?
Stress and strain due to increase load
Organise the following environments from the highest to the lowest rates of corrosion:
- Desert
2.mediterranean - Rainforest
- Arctic
3,2,1,4
When a structure is changed from a non-deformed into a deformed state, it has experienced
Strain
How may corrosion in aluminium be identified
By formation of a grey powered
What are cyclic load ?
Dynamic reversible loads
What part are prone to stress, and the pilot should pay close attention to during the pre flight inspection ?
The Aft pressure bulkhead area (tail skid)
Which of the following areas are most prone to experiencing stress and should be given particularly attention during a walk around?
1) wing spar and skin near the root of the wing
2) wing spar and skin near the tip of the wing
3) fuselage skin near the bulkhead
4) aircraft skin on the bottom and top of the fuselage
5) fuselage around the windows
6) engine nacelles
1,3,4,5
What causes stress on an airframe?
Cycle loads
The principle of damage tolerance in structural design of an aircraft is based on the…..
Capability to withstand a certain amount of damage to structural parts until the damage is detected during an inspection
Ion the context of aviation and loadings on an aircraft’s structure…..
Strain is a measure of the deformation of a loaded structure
The principle of ‘on condition’ maintenance is based on the…….
Monitoring of critical parameters of a component or a piece of equipment and its replacement if a limit value is exceeded
The ratio of the change in size of the deformed structure to the size of the non deformed structure is called……
Strain
How may corrosion of ferrous based metals be identified ?
By brown or reddy/brown discolouration
What liquid is considered highly corrosive?
Hydraulic fluid
For a safe life designed structure…..
One load path is sufficient and the structural element is removed at the end of the life time or number of cycles
With regard to structural stress, fatigue means structural damage due to……
Load cycles
Which of the following indications suggest continuous stress on an airframe ?
Visible cracking
Paint wear and bulges
Impact dents
Faded paintwork
Visible cracking
Which of the following statements are correct or incorrect in reference to loads on an aircraft’s structure?
- Dynamic loads only occur during flight
2.static loads only occur when parked on the apron
Both statements are incorrect (there are constantly loads of all types occurring on an aircraft at all times)
What is strain ?
Strain is a measure of deformation of the fuselage
What aircraft falls under CS-25
Large aeroplanes
Corrosive conditions and a steady tensile load can produce a form of metal fatigue. This is also known as ?
Stress corrosion
What is correct for fail safe designed structural components ?
One load carrying component is sufficient, provided it is strong enough
The design is based on the principle of redundancy of components
Redundancy in systems is…..
The duplication, triplication, or more of critical systems
When may more frequent washing of aircraft’s be scheduled ?
When operating warm oceanic areas or after flying low level over the ocean
During their pre-fight inspection, the pilot notices that many of the rivets on top of the wing are loose, damaged or destroyed, and the underside of the wing is ridged into a way pattern. Which of the following could have caused this damage?
Hard landings or excessive manoeuvring
What are stress and strain zero in an aircraft structure
Never, stress and strain are always present
