kitplane01
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Joined: Thu Jun 16, 2016 5:58 am

747 Long Term Support (Parts)

Sun Oct 08, 2017 8:20 am

How long might Boeing support the 747-8? I don't mean new orders, but producing all the parts, electronics, and databases needed to keep the fleet in the air.

And is there any chance that the 747-400 (which has a huge supply of parts in the desert waiting to be harvested, as well as current Boeing support) will last longer than the 747-8?
 
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747classic
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Re: 747 Long Term Support (Parts)

Wed Oct 11, 2017 2:53 pm

All older 747 series (except the 747SR and 744D aircraft) have been structural limited by hours (747 classic - 135.000 hrs , 744 - 165.000 hrs.)
A few high time 747 classic's reached 135.000 hrs in 35 years. The high time 744 is now at 138.000 hrs.in 28 years
The anticipated limit of validity of the 747-8 series is 165.000 hrs or 35.000 cycles
Average usage with first tier operators : 4000 hrs/year
Max structural operation, supported by Boeing will be approx 40 years (165K devided by 4K), but economically approx 35 years. The count starts with the last produced/sold 747-8.
However, certain electronic LRU's will have to be updated earlier, because of obsolete electronics. (IC's not available anymore)
Operating a twin over the ocean, you're always one engine failure from a total emergency.
 
bhill
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Re: 747 Long Term Support (Parts)

Wed Oct 11, 2017 6:39 pm

Do those cycles only apply to passenger aircraft? What about the tankers or cargo?
Carpe Pices
 
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747classic
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Joined: Sat Aug 15, 2009 9:13 am

Re: 747 Long Term Support (Parts)

Wed Oct 11, 2017 8:20 pm

35.000 cycles is the limit for all 747 aircraft. The limiting factor of the 747 is the pear shaped fwd fuselage. (fatigue caused by pressurization cycles).
Operating a twin over the ocean, you're always one engine failure from a total emergency.

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