Questions tagged [aircraft-structures]

For structural engineering questions about airframes and the mechanical structures aboard aircraft

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9
votes
2answers
2k views

Are lockwires still preferred over self-locking nuts and other ways of bolted joints` safety?

I've watched some of the lockwiring videos and if I understood it right then there are two most widely used ways of ensuring that a bolted joint does not get loose: Lockwire Self-locking nuts ...
3
votes
2answers
352 views

Is pilot alerted of any physical or structural failures?

Current crew alerting system messages, I believe, are displayed basing on the software detection of the failures basing on the sensor information. What kind of structural failures can occur to an ...
12
votes
5answers
12k views

Why do airliners have "pressure bulkheads"?

Image source: FAA What part of the fuselage aft of the bulkhead would leak pressure? Or is it just there to reduce stresses? How does a DC-9/MD-80/90 incorporate aft bulkheads when there's a ...
3
votes
5answers
2k views

Why don't aircraft (commercial and military) use reflective visor windshields?

Just like those used on an astronaut's helmet, these reflective visors can help in better visibility when facing the sun (or any bright light source). But the windshields of most aircraft (commercial ...
2
votes
1answer
434 views

In which cases the lift distribution is not elliptical? (i.e. e≠1)

I understood that Oswald coefficient doesn't modify the induced drag (i.e. =1) if the lift distribution is elliptical. When is the lift distribution not elliptical? What are the physical or ideal ...
1
vote
0answers
62 views

How are the structural failures reported to pilot [duplicate]

For instance an engine separated from aircraft (though most unlikely 1E-13 probability) or wing got damaged, how is it reported to the pilot? Will it be reported as 'Engine Fail' or 'Left Wing Fail'?...
5
votes
1answer
215 views

Does Active Thermal Imaging (NDI method) detect all types of structural faults in modern civil aircraft?

What are the weaknesses of Active thermal imaging in NDI of different composite materials used in aircraft structure ? How much time and effort does it take to complete a full structure inspection ...
1
vote
1answer
1k views

What are the advantages/disadvantages of ultrasonic in aircraft structure inspection?

What i mean by structure is (different composite materials and aluminum). What are the cons in terms of time required to test the full body of the aircraft (B747 for example) in C and D checks ?
4
votes
1answer
417 views

Why isn't aircraft structure inspection done by robots? Is there any known active research on the subject?

From my research I've found that (correct me if i am wrong): Structure inspection (in B,C and D Checks) including (visual, thermography, ultrasonic inspections) looking for structure damage of ...
2
votes
2answers
2k views

How does a full fuselage and structure inspection happen in practice ? (for modern Civil airliners)

What are the intervals at which a full structure inspection take place ? How much time does a test commonly take for narrow and wide body aircraft ? Is every part in the structure manually ...
6
votes
2answers
2k views

Can delamination be detected early?

When a composite structure is hit, the impact causes shockwaves which travel through the structure, and cause delamination. Delamination reduces the strength of the composite structure and may cause ...
7
votes
3answers
4k views

Why are modern aircraft wings often pointed instead being more rectangular?

When viewed from the Z axis (above or below), why are modern aircraft wings often pointed as they get towards the wingtips instead of maintaining the same surface area for their entire length? This ...
13
votes
1answer
2k views

Are modern airliners still stressed-skin aircraft?

Can modern airliners still be seen as stressed-skin aircraft? i.e. is the skin, whether it be aluminium or composites, still an integral structural member of the airplane?

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