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Unexpected cracking found on critical Boeing 737 Next Generation part

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Re: Unexpected cracking found on critical Boeing 737 Next Generation part

#2
> Engineers design pickle forks to last the lifetime of the plane, more than 90,000 landings and takeoffs, a term known as "flight cycles" in the aviation industry, without developing cracks.

That number made me do a double take. Seems planes never stay on the ground for very long.

Re: Unexpected cracking found on critical Boeing 737 Next Generation part

#3
post #2

> Engineers design pickle forks to last the lifetime of the plane, more than 90,000 landings and takeoffs, a term known as "flight cycles" in the aviation industry, without developing cracks. That number made me do a double take. Seems planes never stay on the ground for very long.

Time is money.

Hopefully autonomous vehicles used on demand see many more hours on the road than our personal vehicles.

Re: Unexpected cracking found on critical Boeing 737 Next Generation part

#4
post #2

> Engineers design pickle forks to last the lifetime of the plane, more than 90,000 landings and takeoffs, a term known as "flight cycles" in the aviation industry, without developing cracks. That number made me do a double take. Seems planes never stay on the ground for very long.

They literally stay only the turn around time in commercial aviation in busy operations. At least that is the goal. And of course maintenence and repair.

And an airframe is used over decades. Add some serious safety factor and you are up there at 90000.

But since the 737 max grounding, NGs have seen more usage. So bad news for Boeing. And heaven forbid another grounding - there will literally be not enough physical planes to fly in the skies.

Re: Unexpected cracking found on critical Boeing 737 Next Generation part

#5
post #2

> Engineers design pickle forks to last the lifetime of the plane, more than 90,000 landings and takeoffs, a term known as "flight cycles" in the aviation industry, without developing cracks. That number made me do a double take. Seems planes never stay on the ground for very long.

One flight a day for 90,000 flights is 246 years. You are right.

Re: Unexpected cracking found on critical Boeing 737 Next Generation part

#6
post #2

> Engineers design pickle forks to last the lifetime of the plane, more than 90,000 landings and takeoffs, a term known as "flight cycles" in the aviation industry, without developing cracks. That number made me do a double take. Seems planes never stay on the ground for very long.

They literally stay only the turn around time in commercial aviation in busy operations. At least that is the goal. And of course maintenence and repair. And an airframe is used over decades. Add some serious safety factor and you are up there at 90000. But since the 737 max grounding, NGs have seen more usage. So bad news for Boeing. And heaven forbid another grounding - there will literally be not enough physical p…

> there will literally be not enough physical planes to fly in the skies.

It'd be interesting - flight prices go up and people realise they didn't need to fly as much as they thought they did?

Re: Unexpected cracking found on critical Boeing 737 Next Generation part

#7
post #5
post #2

> Engineers design pickle forks to last the lifetime of the plane, more than 90,000 landings and takeoffs, a term known as "flight cycles" in the aviation industry, without developing cracks. That number made me do a double take. Seems planes never stay on the ground for very long.

One flight a day for 90,000 flights is 246 years. You are right.

Sometimes they fly routes that are only 30min long. With a 30min turnaround, that could mean a flight every hour.

If they kept one plane flying round trips all day, they might fit 16 flights into a day and theoretically burn through the 90,000 cycles in under 16 years.

Re: Unexpected cracking found on critical Boeing 737 Next Generation part

#8
For context, the 737 NG is previous iteration of the 737 (before the MAX) and among the most popular aircraft ever built, with over 7000 in service. Grounding this would absolutely cripple the airline industry.

However, the NG also has an excellent safety record, and 35000 cycles is equivalent to 5 flights (takeoff & landing) every day for 10 years. So while this may lead to extra checks on older aircraft, it's highly unlikely to cause a MAX-style global grounding.

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