5th pod apparently not a fake
▻http://www.avcom.co.za/phpBB3/viewtopic.php?t=81315&p=929037#p928874
For transportation of spare engines, early 747s could accommodate a non-functioning fifth-pod engine... Carrying #cargo internally is always more efficient but the fuel cost due to drag from carrying an engine like this is sometimes less than the cost of hiring a cargo plane to haul a spare engine somewhere to where there is already a short-hop passenger flight going - especially if there is some urgency involved.
A few explanations:
The special wing with fitfh-engine attachment was standard on that 747 subtype - before the advent of wide-body airliners with cargo doors that nowadays can easily accommodate a high-bypass turbofan engine. On the #Vickers VC-10, the configuration for ferrying a fifth engine required a mounting frame - much less elegant: ▻http://www.vc10.net/Technical/oddities.html (bottom of the page)
Detail of the optional fan cover and mounting pod:
And for the fifth-engine fans (I know you’re out there !) here is another entirely different way to mount a fifth engine on a 747:
▻http://www.dvice.com/sites/dvice/files/styles/blog_post_media/public/images/pw_turbo747_3.jpg?itok=kEzdbqWT
▻http://www.dvice.com/archives/2012/05/pratt_whitney_u.php
Sidney Jo-Burg -> short hop ?
:-D
Un grand bravo pour la simplicité de l’explication de pourquoi, il vaut mieux laisser les étages du compresseur libres.
SCADA Systems Are Online Now
►https://www.infosecisland.com/blogview/16696-FACT-CHECK-SCADA-Systems-Are-Online-Now.html
toujours rassurant de savoir qu’une machine aussi complexe qu’un Boeing est munie d’une passoire en guise de logiciel de contrôle d’accès…
For those who do not know, [#Boeing] #747 ’s are big flying #Unix hosts. At the time, the engine management system on this particular airline was Solaris based. The patching was well behind and they used telnet as #SSH broke the menus and the budget did not extend to fixing this. The engineers could actually access the engine management system of a 747 in route. If issues are noted, they can re-tune the engine in air.
The issue here is that all that separated the engine control systems and the open network was NAT based filters. There were (and as far as I know this is true today), no extrusion controls. They filter incoming traffic, but all outgoing traffic is allowed. For those who engage in Pen Testing and know what a shoveled shell is... I need not say more.
So, Scot... FACT CHECK, #SCADA systems ARE ONLINE!