Boeing Considers Developing a 757-PLUS Instead of New Mid-Market-Airplane Dubbed 797
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It's the same and it's different at the same time. The airplane must pass the certification process for carrying cargo but it's very difficult to certify a COMBI due to proximity to the passengers and some of the procedures to starve fires of oxygen would be quiet deleterious and ultimately fatal
As a result, the fatal accident rate of cargo operations is significantly higher than it is for passenger operations.
Further, while they don't talk publicly about it much, the regulators treat cargo operations as more 'expendable' than passenger operations. Examples being the different treatment of Li batteries, and the exemption of cargo aircraft with more than two engines from the requirements of EDTO.
As a result, the fatal accident rate of cargo operations is significantly higher than it is for passenger operations.
As a result, the fatal accident rate of cargo operations is significantly higher than it is for passenger operations.
I don't like your examples. Association does not equal causation
There are plenty of other contributing factors that might be considered in the actual causal chains,
Loma, I'm not talking cause and effect, I'm pointing out evidence that the regulators apply a different standard of safety to cargo operations than they do to passengers. Why else would the rules be different - and they are different as pointed out by my two examples.
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Not sure about it being bollocks - particularly this bit:
I think this is what really hurt the 757-300 - it was simply too long for a single aisle. This made turn times horrible, and on-board service a nightmare - I sat near the back of a 757-300 one time, after we landed I timed it - it took 10 minutes after the door opened before there was even movement where I was sitting (I flew trans-Atlantic on a DC8-60 way back when - it had the same problem).
Direct operating costs per seat mile for the -300 were good, but it took so long to turn that it took a serious hit for productivity. Single aisle becomes problematic when you get much over 200 seats - twin aisle simply works better when you get much above 200 seats.
I think this is what really hurt the 757-300 - it was simply too long for a single aisle. This made turn times horrible, and on-board service a nightmare - I sat near the back of a 757-300 one time, after we landed I timed it - it took 10 minutes after the door opened before there was even movement where I was sitting (I flew trans-Atlantic on a DC8-60 way back when - it had the same problem).
Direct operating costs per seat mile for the -300 were good, but it took so long to turn that it took a serious hit for productivity. Single aisle becomes problematic when you get much over 200 seats - twin aisle simply works better when you get much above 200 seats.
Should Boeing decide to lengthen the current 757, I hope they do a better structural design than Douglas did in lengthening the DC-8 to the DC-8-61. If you sat in one of the rearmost row of seats and the aircraft was experiencing moderate turbulence, it gave one the feeling the rear section was going to torque off from the sections more forward, it was so visibly noticeable. It scared the heck out of unknowing passengers...
My former boss at SAS, Willie Mason, used to work on traffic at Prestwick, and mentioned that crews were asked not to park with the nose wheel at an angle on a DC8-63 as occasionally certain doors wouldn't open.
Zone loading is now the norm . That should cut loading time down . Not quite as quick as playing music and telling everyone grab a seat when the music stops , preferably you own seat Joe ! . We have all played that game and would make last person seated buy the rest of the pax coffee 
Modern computer Zone Loading and music would help . I would suggest dance music like
Manu Debango Soul Makossa . Or the Jeopardy theme would get people moving .
A good theme music might bring some joy back into the journey process .
Zone Loading saves time .
Modern computer Zone Loading and music would help . I would suggest dance music like
Manu Debango Soul Makossa . Or the Jeopardy theme would get people moving .
A good theme music might bring some joy back into the journey process .
Zone Loading saves time .
Agree about zone loading. Even better if you also load from the back as the locos do, but also KLM at AMS through airbridges. A lot of 753s are used on longer routes likes West Coast to Hawaii where loading times are less important.
The DC8 60s series were good aircraft from a cost viewpoint. The obvious way forward was to replace four engines with two more efficient ones, which gives you, err, the 753. There's a definite comfort gain in having twin aisles though.
The DC8 60s series were good aircraft from a cost viewpoint. The obvious way forward was to replace four engines with two more efficient ones, which gives you, err, the 753. There's a definite comfort gain in having twin aisles though.
Twin aisles, Zone boarding and also make use of the rear doors too, all of which ought to be a minimum design feature. If it saves time and makes pax on/off more efficient then that is a bonus as well.
777-300 is a lot longer than a 757-300 - granted a greater proportion of premium seats and mainly long haul so turnround times less critical, but can't see that being a twin aisle makes that much difference to loading/unloading speeds?
Is now not the perfect time for Boeing to come up with a complete new family of aircraft?
Selling any new aircraft in the next few years in any numbers will be pretty tough.
The government will not let it fail.
The MAX has issues.
The 747 is pretty much over.
They lack a small regional aircraft.
A complete new series of clean sheet aircraft with much in common could be a long term win & it could be possible to meet the regs for comi configurations on a clean sheet.
Selling any new aircraft in the next few years in any numbers will be pretty tough.
The government will not let it fail.
The MAX has issues.
The 747 is pretty much over.
They lack a small regional aircraft.
A complete new series of clean sheet aircraft with much in common could be a long term win & it could be possible to meet the regs for comi configurations on a clean sheet.
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Is now not the perfect time for Boeing to come up with a complete new family of aircraft?
Selling any new aircraft in the next few years in any numbers will be pretty tough.
The government will not let it fail.
The MAX has issues.
The 747 is pretty much over.
They lack a small regional aircraft.
A complete new series of clean sheet aircraft with much in common could be a long term win & it could be possible to meet the regs for comi configurations on a clean sheet.
Selling any new aircraft in the next few years in any numbers will be pretty tough.
The government will not let it fail.
The MAX has issues.
The 747 is pretty much over.
They lack a small regional aircraft.
A complete new series of clean sheet aircraft with much in common could be a long term win & it could be possible to meet the regs for comi configurations on a clean sheet.
Maybe in 3 years time things will be easier?
On a positive note there is no revolutionary new engine available right now that would be required before starting any uber-competitive new design. So waiting five years or so for it to be ready will do no harm. At the same time oil is too cheap now to trigger much demand for more efficient new airplanes. There are just too many old ones available for cheap now and they will be during the next few years.
Last edited by Less Hair; 17th May 2020 at 19:34.
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True but this is already available.
"We" would need something newer and better to top some A321neo with today's latest GTF and PIP by a few percent engine wise. Possibly something with huge bypass ratio and diameter? If a new engine can be integrated from scratch more efficencies will be gained. CFRP wings (maybe a high wing layout?) and fuselage and these new engines with some smart cockpit might make it work one day. I'd say before the late 2020s no new engine like the one needed will be available.
"We" would need something newer and better to top some A321neo with today's latest GTF and PIP by a few percent engine wise. Possibly something with huge bypass ratio and diameter? If a new engine can be integrated from scratch more efficencies will be gained. CFRP wings (maybe a high wing layout?) and fuselage and these new engines with some smart cockpit might make it work one day. I'd say before the late 2020s no new engine like the one needed will be available.
