Bio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7 Posted (12 years 1 month 2 weeks 1 day 15 hours ago) and read 2225 times:
I just learned the RAT on the DC-10 (and I assume on the MD-11) is located near the front of the fuselage, just as in some business jets. Considering aircraft manufacturers are always taking into account a lot of safety issues with the aircraft integrity, isn't it a risk to put the RAT foreward considering if it breaks the engines might ingest debris? What sort of requirements are needed for a RAT being certified? Am I being too paranoid?
LMP737 From United States of America, joined May 2002, 4692 posts, RR: 22
Reply 3, posted (12 years 1 month 2 weeks 1 day 11 hours ago) and read 2177 times:
There are several things to remember about the placement of the RAT on the DC-10 and MD-11. If the RAT does come apart for some reason chances are the debris will not be ingested by the #1 and #3 engine. Besides if you deploy your RAT and it fails you have some serious problems other than worrying whether the pieces damage an engine. Since there are fewer and fewer DC-10's and MD-11's flying passengers the chances of you actually being on one when they have to deploy the RAT are slim.
Dash8tech From United States of America, joined Jul 1999, 732 posts, RR: 5
Reply 5, posted (12 years 1 month 2 weeks 1 day 6 hours ago) and read 2158 times:
The RAT is the "Ram Air Turbine", sometimes also called the ADG or "Air Driven Generator". Used to supply back up electrical and hydraulic power in the event of a serious failiure of the afformentioned.
As far as my experience goes in aircraft MTX, the RAT as it was called in the Navy on the A-6 Intruder was mounted on the left wing. The ADG on the CRJ is mounted on the right side of the nose just aft of the radome.
But like many have mentioned, if you need to use it the least of your worries would be it fodding an engine (if you have one running!) if it too came apart.
Rick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 51
Reply 7, posted (12 years 1 month 2 weeks 20 hours ago) and read 2130 times:
"Used to supply back up electrical and hydraulic power"
Remember the RAT (or ADG) does not always provide both backup electrical and hydraulic power. On the 767, for example, it only provides hydraulic power to the flight controls portion of the Centre Hydraulic System (which theoretically gives us enough juice to still be able to control the aircraft).
I used to love the smell of Jet-A in the morning...
DL_Mech From United States of America, joined Feb 2000, 2050 posts, RR: 9
Reply 11, posted (12 years 1 month 2 weeks 2 hours ago) and read 2087 times:
I would assume that RAT (ADG) positioning has a lot to do with cable run lengths or hydraulic plumbing complexities.
The DC-10/MD-11 ADG is located near the cockpit, so that the mechanical deploy linkage from the cockpit is kept as simple as possible. It is also near the Avionics Compartment which houses some of the components that power the Aux Hyd Pump -1.
The L-1011 has a hydraulic-generating RAT that is located just forward of the main wheel wells. It was deployed by an explosive squib (no mechanical cables) and is close to the Hydraulic Service Center, minimizing the hydraulic plumbing needed from the reservoirs.
The 757/767's have a similar hydraulic-generating setup near the main wheel wells.
The 777 has both Electrical power and Hydraulic power generation from its RAT.
This plane is built to withstand anything... except a bad pilot.
Muddydawg From Portugal, joined Jan 2003, 56 posts, RR: 0
Reply 13, posted (12 years 1 month 1 week 6 days 16 hours ago) and read 2066 times:
When I was stationed at Travis on KC-10's every time they came home from "C Check" they used to deploy the RAT. After they did the FMS 800 mods the first two that came home from "C Check" that deployed the RAT caught the #1 Aux pump on fire. I never did find out why. Does anybody know if this happened much on the civilian side of the -30 series 10's.