Questions tagged [fatigue]

Questions about how aircraft components that are repeatedly stressed slowly weaken over time, and can eventually break apart.

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2answers
174 views

Why don’t double-bubble fuselages cause severe fatigue problems?

In response to my previous two questions about fatigue issues, or the lack thereof, generated by the cusps in double-bubble-fuselaged aircraft (Stratocruiser, DC-9-80), I received a number of answers ...
4
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0answers
101 views

Is In-Seat Rest used regularly where it is legal, and is it restricted by airline SOPs?

This answer says that a pilot who is not flying (PNF) can make use of a procedure called In-Seat Rest to take a nap during flight. A comment on the same answer says that this is illegal in the US, ...
3
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2answers
183 views

What are the characteristics of the F-16 airframe lifetime?

What limits the lifetime on the F-16 airframe? I assume it is material fatigue, but what kind, and where on the airframe? Moreover, what exactly happens? What will happen if this problem is ignored? ...
13
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4answers
2k views

Why does the DC-9-80 have this cusp in its fuselage?

The fuselage of the McDonnell Douglas DC-9-80 (marketed as the "MD-80") has a pronounced cusp at floor level, as can be seen in this diagram (courtesy of Boeing, eater of McDonnell Douglas - at least, ...
3
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1answer
187 views

Why weren’t the Comet’s overhead ADF windows roundified along with its passenger windows?

Following the crashes of two Comet 1s in early 1954 due to metal fatigue, all future Comets (and the few surviving Comet 1s that were rebuilt rather than scrapped, all of them in military service) ...
9
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2answers
557 views

Did the cusp in the Boeing 377/C-97/KC-97’s fuselage structure cause fatigue problems?

The Boeing 377 Stratocruiser - a civilian adaptation of the C-97, a military transport which would also later be developed into the KC-97 - were derived from the B-29/B-50 family by grafting a large, ...
3
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3answers
2k views

What is the fatigue life of a fuselage based on?

The fatigue life of the fuselage is based on the number of what? Pressurization cycles?
23
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4answers
9k views

How is metal fatigue detected in an aircraft?

There have been many accidents involving metal fatigue. How do the engineers, maintenance team, etc. know if an aircraft has metal fatigue? What is done to "minimize" metal fatigue or repair it?
1
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0answers
796 views

Is the Boeing 737 unusually susceptible to stress fatigue?

According to this Newsweek article - which seems like a reputable source - the FAA has issued a number of Airworthiness Directives to address stress fatigue concerns with the 737NG series: Between ...