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Home > Airplanes > Has the Boeing 787 an emergency generator (RAT) capability in case of both engine failures?
Has the Boeing 787 an emergency generator (RAT) capability in case of both engine failures?
Aviation - Airplanes
Saturday, 19 January 2013 06:15

Japanese airlines ground the Boeing 787 Dreamliner

Dear Capt Lim

In light of the current problems with batteries being experienced with the Boeing 787 Dreamliner - which has no hydraulics - I am wondering if you know whether the Dreamliner is equipped with an electrical generator equivalent to the Ram Air Turbine system (RAT) you described for getting emergency hydraulics when the engines fail in flight.

RH

Dear RH,

Yes, the Boeing 787 Dreamliner has an emergency generator equivalent to the Ram Air Turbine (RAT) that deploys in the event of both engine failures.

It is not true to say the B787 has no hydraulics. In fact, it has 3 hydraulic systems - left, right hydraulics and central electrical hydraulics system.

In the air, besides having the emergency generator (Ram Air Turbine or RAT which is deployed when both the engines failed and this is used to provide just enough power for the central electrical hydraulic system), the other sources of electrical power for normal flight are derived from the 2 engine generators, the battery and the APU generator.

PS. To check for any latest updates or postings, you can follow my new Twitter at @CaptKHLim


Deployment of the RAT on a Boeing 767


Boeing 787 Documentary (Rolls Royce Engines)

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