Uncontained Engine Failures

[army_av8r]

so, a while back i was sifting the Net when i came across what i remember to be a B206 that appeared to have parted ways with at least 1 turbine wheel. my memory isnt that great though... well, now i cant find the photo and was hoping someone may have it. the photo shows the path the turbine wheel exited the engine, and the slice it took out of the cowling. it also showed the subsequent forced landing. if anyone can point me in the right direction, or has similar photos that would help alot... Happy New Year!

[500e]

http://i98.photobucket.com/albums/l259/500d_2006/IMG_8912.jpghttp://i98.photobucket.com/albums/l259/500d_2006/IMG_9071.jpgNot a 206 but hope this gives you the feel :uhoh: There was a lot more damage :eek:http://i98.photobucket.com/albums/l259/500d_2006/IMG_9068.jpg

[ericferret]

Is it a 500C?

[Aesir]

A AD was issued for the RR250C20 series requiring a energy absorption ring fitted around the 1st stage compressor wheel.

So this is no longer a issue on these engines.

Applicability: Model 250-B17B, B17C, -B17D, -B17E, -C20, -C20B, - C20F, -C20J, -C20S, and -C20W turboprop and turboshaft engines that are not fitted with a turbine energy absorbing ring, P/N 23035175, or an equivalent approved turbine energy absorbing ring.
These engines are installed on, but not limited to Aerospatiale AS 355F1, Agusta AB206B, Bell 206B, Bell 206L, Bolkow BO 105 DBS-4, Hiller UH-12E, GAF N24A, Hughes 369D, Hughes 369E and Hughes 369HS aircraft.
Requirement: To minimize the risk of uncontained 1st stage turbine wheel fragments from causing damage to the aircraft or damage to the second engine on twin-engine installations, which could lead to loss of control of the aircraft, install a turbine energy absorbing ring, P/N 23035175, or an equivalent approved turbine energy absorbing ring, in the plane of the 1st stage turbine wheel, per paragraphs 1.M., 2.A., and 2.B. of Rolls-Royce Corporation Alert Commercial Engine Bulletin CEB-A-1255, revision 4.
(FAA AD 2005-10-13 refers)
Compliance: At the next disassembly of the turbine rotor module, or within 1750 hours time since new, overhaul, heavy maintenance or last hot section inspection, whichever occurs first, but no later than 31 October 2011, unless already accomplished.
Effective Date: 30 June 2005

[500e]

Yes US police machine If I remember correctly Phoenix air support, there was extensive damage in tail boom I think frames ,but missed shaft, we made offer but turned down.

[diethelm]

Aesir is correct but the energy containment ring is is the 1st stage of the turbine not the compressor. It is in the Gas Producer section of the turbine which is closest to the burner can. The historic failures was an un-contained failure of the first stage turbine wheel which would fling out and make a mess of other parts just like the picture. The first stage wheel is closest to the fire and has a bit more stress and is subject to repeated heat cycles. Some people argued that the failure of the 1st state turbine wheel may be a result of undocumented hot starts or repeated over-temps. In either case, when it comes apart it makes a little noise. :eek:

[Ian Corrigible]

That actually looks more like a Columbus PD aircraft. They suffered uncontained RR250-C20 failures in August 2012 and October 2007.

One of Houston PD's 500s also suffered an uncontained engine failure in May 2009, the turbine wheel punching a fist-sized hole through the clamshell door.

I/C

[chopjock]

Does any one know why the C18 apparently does not suffer from this problem?

[js0987]

Back in the 1980's Air Logistics had an S76A that had a turbine burst as a result of a broken "peashooter." (The shaft that mounts the turbine wheels). The shrapnel took out the other engine, the tail rotor and the DC Junction Box. Fortunately the aircraft was at 500' and into the wind. Even though the cabin filled with smoke, the crew successfully autorotated to the water. With no power, there were no floats and no way to send a Mayday call. All 10 pax and the crew were able to scramble to safety. With the aircraft overdue, another 76 soon found the upside down aircraft and everyone in the water and directed a boat to the scene.

To Allison's credit, shortly after, they outfitted an large truck as a mobile classroom and presented a slide show to customers at the Houston Offshore Technology Conference explaining what happened and how they were going to fix it. They then drove the truck around to all of the bases on the Gulf coast and gave the same presentation. They were not shy in admitting that their "new and improved" peashooter was poorly designed.

Needless to say both Allison and Sikorsky made some changes.

[500e]

IC you are correct it would be the 07 one if it is, definitely not 2012

[500 Fan]

I'm not sure what caused this incident (engine trouble?) but overall, the result wasn't too bad. Everybody walked away, it appears. The 500 needs a little TLC but should probably fly again.

Police helicopter makes emergency landing on West Side street | The Columbus Dispatch (http://www.dispatch.com/content/stories/local/2012/08/16/police-helicopter-makes-emergency-landing.html)

It looks like they slid up to the kerb and, looking at the leaves on the ground, did a little tree-trimming before everything stopped. Skill or sheer good fortune (or a generous mix of the two) ensured they didn't hit a telegraph pole or a car.

500 Fan.

[Ian Corrigible]

Yes, uncontained IFSD. Previously discussed here (http://www.pprune.org/rotorheads/504243-uncontained-engine-failures.html#post7615739), prelim report here (http://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20120816X64012&key=1).

I/C

[500 Fan]

Oops. I should have looked at the date on that report before I posted it. Apologies. :O

500 Fan.