Safe Landing

FlyQXCRJ · Post by **FlyQXCRJ** » Sat Nov 20, 2004 5:49 pm

Greetings: Just have to show off a bit - - enroute from KJFK to VIDP approx. 150 NM E of PFAI I experienced a total loss of all hydraulics. I used differential power and spoilers to manipulate the aircraft and made a safe landing in Fairbanks! Matt

Tsuru · Post by **Tsuru** » Sat Nov 20, 2004 6:00 pm

"How could you have used spoilers with no hydraulics? [img]style_emoticons/<#EMO_DIR#>/huh.gif[/img] To my recollection not even the trim works on a 747 classic if all hydraulics are out, and you need to extend the flaps using electric motors."

FlyQXCRJ · Post by **FlyQXCRJ** » Sat Nov 20, 2004 6:11 pm

"When I commanded the spoilers to extend, I expected nothing to happen as well - - - however, I assume that the RFP folks also accounted for hydraulic accumulators just like a real airplane. For those that don't know, accumulators are there to help the system meet demands as they come - also, accumulators will provide a small amount of hydraulic power for critical demand should the system fail (like what happened to me). No, I did not have trim available, but I did have power - just like the United DC-10 in Sioux City. More power, I pitch up - less power, I pitch down. Later, Matt"

Tsuru · Post by **Tsuru** » Sat Nov 20, 2004 6:24 pm

"The normal accumulators are only there to provide extra volume capacity in case the pumps can't cope by themselves. In the Sioux-city accident all three of the DC-10's hydaulic systems were drained of their oil by all three of them being ruptured by a desintegrated fan disc of the no. 2 engine. This turned out to be a serious design flaw of the Diesel 10 and no accumulator in the world is going to help you then! By saying you had lost all hydraulics you mean there is no pressure in all four systems (although the pumps are still working), meaning there is most likely a leak in all four systems. The only way an accumulator can help is if you just turn off the engine- and air driven pumps, with the systems intact, this way the pressure in the systems will very slowly dissipate by small leaks in the actuators and control inputs, helped ofcourse by the presence of accumulators, and you are able to see this on the F/E panel. Although it has to said that the only accumulators that are really there to provide emergency hydaulic power are the ones that power the wheel brakes. [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img] FS2004, even with RFP V2, is not capable of simulating a ruptured hydraulic line or even correctly simulate the hydaulic pressure dissipating after you turn the pumps off. Have you tried Aerowinx PS1.3a? To my knowledge this is the only consumer 747 simulation that can do this. [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]"