Hi Tim,"Hmm, the bleed checkvalves upstream of the L/R/C resevoirs and the standpipes should provide enough pressure/positive flow of fluid to the hydraulic pumps to maintain operability."Ok, sorry, didn't know about that one. I just read that you needed bleed air to maintain positive hydraulic fluid flow. I also recall that on the A320, losing the bleed air system in a system due to a leak or overheat, you'd have to switch off the complete hydraulic system on the respective side. Good to know the 767 is different :-)"If you have dual flame-outs and lose bleeds ala' Canadian 767 and deploy the RAT there is sufficent pressure in the system to maintain positive flow thru the electric pumps"Which electric pumps are you referring to? If you lose both engines, and no APU available due to no fuel, wouldn't you lose both IDG's and with that both main AC busses?Regards,Mark

My correct e-mail adress is:[email protected] :-mad would be great if you can send it once more- I really apologize!

Hi Randy, may I have it too? [email protected]

CVMNope, don't fly with BBall, court restraining order....very messy (chuckle) Actually I have about a year seniority on the good Captain. To my knowledge we have never actually flown together. (Anyone who clips a big ol' Wendy's Fries to the yoke is OK by me though....) There is a few thousand of us so I haven't met everyone (just seems that way)Mark,"Which electric pumps are you referring to? If you lose both engines, and no APU available due to no fuel, wouldn't you lose both IDG's and with that both main AC busses?"Kind of muddled that and thinking back to the Boeing 767 blur in Seattle training in '83-'84. The 767 ERs I belive have a Hydraulic driven generator coupled-in with the C (Center) hydraulic system. When the RAT deploys it prowers the C System and that HDG. The C sys stays pressurized as you glide on-down. This is from the "Way Back" memory machine. Really not sure what bus(es) pick up power from that.The 757 would get juice from the battery on the standby AC/DC buses, BAT bus and hot battery bus. The RAT picks up Center hydraulics.Tim_757

Hi Tim!I always thought the RAT would bypass the normal systems connected to the center hydraulic system and only power the primary flight controls? Thud the HMG would not be powered by the RAT. But this is a very interesting issue, as I have asked the same question a lot of times and was never given a definate answer! Maybe we can clear this up.Assuming a dual IDG failure, the HMG would kick in and basically be powered by the ADP as the center electric pumps would be inop, right?I guess the sim could answer these question :-)Regards,Mark

Not yet. Please Randy , would you have one more [email protected]