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767 Ram Air Turbine  
User currently offlineNJTurnpike From United States of America, joined May 2000, 580 posts, RR: 0
Posted (13 years 11 months 8 hours ago) and read 3640 times:

I was intrigued to learn of the 'RAT' fitted to 767s; a fan device giving emergency hydraulic power to an aircraft, enabling the crew to perform a dead-stick landing. The story of the Air Canada 'Gimli Glider' is at

http://www.frontier.net/~wadenelson/successstories/gimli.html

It's quite a read, I'd highly recommend it. Are there any more stories like the one above, describing successful use of the RAT? Seems quite surprising that it's not been talked about more often, it seems like a device that really could be put into more widespread use on other airliners. Has the RAT been implemented elsewhere? Thanks for any answers you can give,

~NJTurnpike



14 replies: All unread, jump to last
 
User currently offlineNJTurnpike From United States of America, joined May 2000, 580 posts, RR: 0
Reply 1, posted (13 years 11 months 8 hours ago) and read 3386 times:

Sorry, don't know how my topic font became bold - it wasn't on purpose!

~NJTurnpike


User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2146 posts, RR: 10
Reply 2, posted (13 years 11 months 3 hours ago) and read 3370 times:

I know for a fact that the B757 has a RAT as well.

User currently offline777x From , joined Dec 1969, posts, RR:
Reply 3, posted (13 years 11 months 3 hours ago) and read 3366 times:

they are also present on A310 & B777 (Probably on A330 as well)


User currently offlineBoomer From United States of America, joined May 1999, 102 posts, RR: 0
Reply 4, posted (13 years 10 months 4 weeks 1 day 19 hours ago) and read 3327 times:

RATs are also used on L-1011 for hydraulic power. It is located along the aircraft centerline just forward of the main wheelwells.

The DC10 and MD11 aircraft have a deployable propeller driven device called an ADG (air driven generator) that produces electric power. The electric power can be used to power electric hydraulic pumps and very limited instruments and radio, or no hydraulic pumps with a larger assortment of electric equipment. The ADG is located on the lower right side of the fuselage next to the right nose landing gear door.


User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3700 posts, RR: 34
Reply 5, posted (13 years 10 months 4 weeks 1 day 18 hours ago) and read 3317 times:
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The A330/340 has the RAT in the #4 Flap Fairing on the RH wing.

The VC10 has a RAT driven elect. generator under the fuselage/wing ctr section.

There is one story of a VC10 crew flying between (I think) HKG & NRT where the F/E was distracted during a fuel transfer and managed to feed all the engines off one tank until the tank was empty. When the engines flamed out they dropped the RAT to recover electrical power until they could get the engines started again. Now the RAT can only be stowed on the ground so they had the choice of either returning to HKG or continuing. As they wanted to keep the 'faux pas' quiet they elected to continue but thought it best to contact Maintenance Control in London to check they could fly normally with the RAT down. Maintrol's first question was "Why did you have to deploy the RAT ?"


User currently offlineCrjmech From United States of America, joined Jun 2000, 260 posts, RR: 1
Reply 6, posted (13 years 10 months 4 weeks 1 day 4 hours ago) and read 3302 times:

The Canadair RJ is also equipped with an ADG, located on the right-hand side of the nose just aft of the radome. It deploys automatically when both engine IDGs and the APU generator go south. The crew can also manually deploy the unit. We occasionally have to test the ADG operation and since we lack the equipment necessarry to spin it up on the ground, we perform a test flight. What a racket! Both inside the cockpit and on the ground the noise is unmistakable. The ADG is also a good way to yank the chain of a green F/A or ramper. Many have been told that it is a trolling motor for water landings or an auxillary taxiing motor.


Thou shalt mind thine altitude,lest the ground reach up and smite thee.
User currently offlineNJTurnpike From United States of America, joined May 2000, 580 posts, RR: 0
Reply 7, posted (13 years 10 months 4 weeks 23 hours ago) and read 3282 times:

Great replies everyone, I'm now on the lookout for a picture or diagram of a RAT or ADG. If you know of any, please let me know..

Thanks!

~NJTurnpike



User currently offlineTomH From United States of America, joined May 1999, 960 posts, RR: 2
Reply 8, posted (13 years 10 months 4 weeks 19 hours ago) and read 3273 times:

Ram Air Turbines have been used on military aircraft, especially fighters, for forty years or more. There is a long history of their succesful use. The F-16 Emergency Power Unit (EPU) works through the action of a gas stored aboard the aircraft.

User currently offlineEvilboy From , joined Dec 1969, posts, RR:
Reply 9, posted (13 years 10 months 4 weeks 18 hours ago) and read 3271 times:

The 757 also has a RAT, I know this because my supervisor was reaching for the battery switch in the cockpit but hit the RAT switch, anyways, the thing popped out, and he got in trouble. The 737s don't have one because they are able to fly without hyd pressure.

User currently offlineRioSul From Brazil, joined Mar 2013, 0 posts, RR: 0
Reply 10, posted (13 years 10 months 4 weeks 14 hours ago) and read 3270 times:

Hey NJTurnpike,

I just typed "Ram Air Turbine" into yahoo and I found this site. It has a brief description of RATs, a picture, and a view of a RAT sticking out of some type of RJ.

http://ww3.hamiltonsundstrandcorp.com/aerospace/products/ram_air_turbine.htm

Hope this helps,

RioSul 


User currently offlineNJTurnpike From United States of America, joined May 2000, 580 posts, RR: 0
Reply 11, posted (13 years 10 months 3 weeks 6 days 8 hours ago) and read 3227 times:

Thanks RioSul, unfortunately the page won't open for me right now, but I'll try later.

~NJTurnpike


User currently offlineJim From United States of America, joined Jul 1999, 455 posts, RR: 1
Reply 12, posted (13 years 10 months 3 weeks 5 days 20 hours ago) and read 3217 times:

There was one other case of a RAT deplyment on a 767 that I know about. The time that the DAL flight crew 'accidentally' turned off the engines after leaving LAX. The RAT auto-deployed, and the crew got the engines started again, and then continued on to CVG. The RAT was damaged by being run for 4 hours!

User currently offlineTn283 From , joined Dec 1969, posts, RR:
Reply 13, posted (13 years 10 months 3 weeks 4 days 16 hours ago) and read 3201 times:

There is a picture of a RAT on an A310 on this website. Select A300/310 in the photo section and then select the accident category. Scroll through the thumbs and you will eventually see it.

User currently offlineCrjmech From United States of America, joined Jun 2000, 260 posts, RR: 1
Reply 14, posted (13 years 10 months 3 weeks 4 days 12 hours ago) and read 3196 times:

The RJ in question is a series 200 CRJ with it's ADG deployed. The ADG is the old "wet" type that uses fluid pressure to adjust blade pitch, maintaining optimum generator speed. The newer "dry" type uses a purely mechanical governor. The AC generator is visible in the photo. It's located at the top of the ADG strut.


Thou shalt mind thine altitude,lest the ground reach up and smite thee.
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