FlyerTalk Forums - View Single Post - 30 Nov - UA 512 [JFK-SFO] Diverts to ORD Due to In-Flight Hydraulics Failure
Thread: 30 Nov - UA 512 [JFK-SFO] Diverts to ORD Due to In-Flight Hydraulics Failure
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Old Dec 3, 2012 | 10:25 am
  #26  
LarryJ
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Originally Posted by SLC
Could the terrible noise have been the ram air turbine (RAT) operating to power the hydraulic systems? (For that matter, does the 757 have a RAT?)
The RAT doesn't power the hydraulic system, only the flight controls. It deploys when both engines fail as the failure of both engines removes the engine-driven hydraulic pumps and the generators which power the electric hydraulic pumps.
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