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  #1  
Old 05-21-2019, 05:50 PM
greghughespdx greghughespdx is offline
 
Join Date: Nov 2011
Location: Aurora, OR
Posts: 582
Default RV-12 Service Bulletin 19-03-22 Published - Possible cracks in #2 exhaust tube

Document Name: Service Bulletin SB 19-03-22
Effective: May 21, 2019
Subject: Cracking of the EX-00017 Cylinder #2 Exhaust
Affected Models: RV-12 with 912 ULS engines
Affected Serial Numbers: All RV-12 model aircraft (RV-12iS is not affected)
Required Action: Inspect the EX-00017 Cylinder #2 exhaust tube for cracks as described in this document. If cracks are found, replace the EX-00017 with an EX-00017-1.

Van’s Aircraft has released a Service Bulletin (SB 19-03-22) affecting all RV-12 aircraft equipped with a Rotax 912 ULS engine and a specific configuration/version of the Cylinder #2 exhaust pipe. Depending on when the RV-12 firewall-forward kit was produced, there are three possible designs for the Cylinder #2 Exhaust Tube. Only one of those designs (EX-00017) is affected by the service bulletin. Inspection is required in order to determine which specific part is installed on an individual aircraft.

Data from the field suggests that some EX-00017 Cylinder #2 Exhaust Tubes are prone to fatigue cracking. If the pipe fails, hot gases from the exhaust may eventually compromise the composite cabin heat duct, which could in turn result in the introduction of dangerous exhaust gases into the cabin if the cabin heat door was open. Complying with this service bulletin will ensure aircraft equipped with affected parts are furnished with a sufficiently robust part, equivalent to aircraft equipped with newer parts.

Before further flight, owners are instructed to inspect their aircraft to determine which part is installed, and in cases where the affected part is installed to either replace the part with a new part available from Van’s Aircraft or to equip the aircraft with a carbon monoxide detector and then inspect the affected part at regular intervals. If a cracked pipe is found, the new part must be acquired and installed. Note that once a crack develops in the affected part, it is likely the exhaust pipe will fail quickly. Therefore, regardless of whether any cracks are observed, Van’s Aircraft recommends that any affected part be replaced proactively, to avoid the possibility of a crack-related failure. The use of an aviation-grade carbon monoxide detector prior to replacement is an option, but should not be considered a long-term solution.

Photos of the affected part are included in the service bulletin document, in order to aid in identification and to help determine whether or not the installed part is the one covered by this bulletin.

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Opinions, information and comments are my own unless stated otherwise. They do not represent direction/opinions of my employer.

Building RV-8A since Sept 2014 (N88VX reserved)
Dual AFS 5600, Avidyne IFD 440, Whirlwind 74RV, Superior XPIO-360
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Last edited by greghughespdx : 05-21-2019 at 06:09 PM.
  #2  
Old 05-22-2019, 10:19 AM
BigJohn BigJohn is offline
 
Join Date: Nov 2008
Location: Gloversville, NY
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Hey Greg, my FWF kit was shipped April 2010. Any idea of which pipe came during that time period? Just being lazy about pulling the cowl.
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  #3  
Old 05-22-2019, 10:34 AM
greghughespdx greghughespdx is offline
 
Join Date: Nov 2011
Location: Aurora, OR
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Quote:
Originally Posted by BigJohn View Post
Hey Greg, my FWF kit was shipped April 2010. Any idea of which pipe came during that time period? Just being lazy about pulling the cowl.
Hi John. Sorry, but no. Given the importance of knowing for certain, the only way to properly/safely check is to actually take a look. You may only need to remove the top half of the cowl and use an inspection mirror, but the best way is to remove both halves.

Knowing for certain which part is installed is the main need.

greg
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Opinions, information and comments are my own unless stated otherwise. They do not represent direction/opinions of my employer.

Building RV-8A since Sept 2014 (N88VX reserved)
Dual AFS 5600, Avidyne IFD 440, Whirlwind 74RV, Superior XPIO-360
VAF build thread - Flickr photo album - Project Facebook page
Hillsboro, OR (EAA 105)

  #4  
Old 05-24-2019, 08:57 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,462
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$230 for the new part. A bit pricy! I hope mine is not the affected revision. Will check sometime in the next two weeks and keep my fingers crossed!
  #5  
Old 05-25-2019, 08:27 AM
greghughespdx greghughespdx is offline
 
Join Date: Nov 2011
Location: Aurora, OR
Posts: 582
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Quote:
Originally Posted by RFSchaller View Post
$230 for the new part. A bit pricy! I hope mine is not the affected revision. Will check sometime in the next two weeks and keep my fingers crossed!
That point was raised a couple of times this week in discussions with customers about this SB. We probably should have stated in our initial post here that Van’s is providing this part, which is somewhat complex and labor intensive to manufacture, at-cost to owners who are replacing affected parts.

A couple other questions we've answered this week:

Q: Have there been actual cracks of this pipe occur in the real world?
A: Yes, on at least two occasions we have observed a failure of this exhaust pipe section, which resulted in burn damage to the engine cowl at the air inlet tunnel, which provides cabin heat.

Q:What’s the worst thing that could happen if this pipe fails?
A: Failure of the exhaust pipe could result in hot exhaust gases eventually burning through the air inlet duct in the cowl, which would result in the introduction of exhaust gases and carbon monoxide into the air inlet duct, and potentially in turn into the cabin of the aircraft where it could affect occupants.

Personal statement, made as an individual: I happened to be the pilot of an RV-12 in one of the two occasions mentioned in the above above point (this was not one of the company-owned airplanes). I was able to recognize the occurrence of the failure, determine what was likely happening, and get the airplane safely on the ground before things got too much worse. I did have to repair the fiberglass cowl/duct in that case and the inlet duct material, although substantially heat damaged, had not burned all the way through. That said, had I not recognized the occurrence in a timely enough manner, the outcome could have been different. So, from personal experience I'd suggest - as an individual aircraft operator and pilot - that a taking the proactive approach on this (replacing the affected part) is in my opinion a smart, reasonable and relatively small price to pay. Heck, you don't even want to know how many AMU's it cost me a couple years ago to replace an exhaust section that had failed on the certified spam-can aircraft I owned! And, I replaced that same part twice in a 10 year period! I'm still trying to wipe those expenses from my memory!
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Van's Aircraft - Community, Media, Marketing
Van's web site | Instagram | Facebook
Opinions, information and comments are my own unless stated otherwise. They do not represent direction/opinions of my employer.

Building RV-8A since Sept 2014 (N88VX reserved)
Dual AFS 5600, Avidyne IFD 440, Whirlwind 74RV, Superior XPIO-360
VAF build thread - Flickr photo album - Project Facebook page
Hillsboro, OR (EAA 105)


Last edited by greghughespdx : 05-25-2019 at 08:35 AM.
  #6  
Old 05-25-2019, 08:42 AM
TS Flightlines TS Flightlines is offline
 
Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,263
Default

HUM---a good tube bender could make those bends without the welded section. Maybe Clint will chime in.

Tom
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  #7  
Old 05-25-2019, 08:50 AM
benfra benfra is offline
 
Join Date: May 2007
Location: ft MYERS, FL Based @KPGD
Posts: 22
Default RV12 exhaust

I posted about an exhaust some time ago,the story is I had an exhaust break, at a weld on a Long Eze. It caught the cowling on FIRE.Probably on taxi in. The eze was saved. My point is: exhaust can ignite fiberglass, to me this the most serious aspect of replacing the pipe! Ben
  #8  
Old 05-25-2019, 03:37 PM
AirHound AirHound is offline
 
Join Date: Oct 2006
Location: OFallon IL now, everywhere before
Posts: 299
Default Exhaust Wrap

I’ve no experience with wrap, but have been told it cuts down the heat greatly.
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  #9  
Old 05-25-2019, 04:11 PM
greghughespdx greghughespdx is offline
 
Join Date: Nov 2011
Location: Aurora, OR
Posts: 582
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Quote:
Originally Posted by AirHound View Post
I’ve no experience with wrap, but have been told it cuts down the heat greatly.
Do not wrap the RV-12 exhaust. It's not manufactured not intended for that. And, it would have no impact related to the issue described in the SB, other than to make it basically impossible to examine the pipe itself.
__________________
Van's Aircraft - Community, Media, Marketing
Van's web site | Instagram | Facebook
Opinions, information and comments are my own unless stated otherwise. They do not represent direction/opinions of my employer.

Building RV-8A since Sept 2014 (N88VX reserved)
Dual AFS 5600, Avidyne IFD 440, Whirlwind 74RV, Superior XPIO-360
VAF build thread - Flickr photo album - Project Facebook page
Hillsboro, OR (EAA 105)

  #10  
Old 05-25-2019, 04:25 PM
AirHound AirHound is offline
 
Join Date: Oct 2006
Location: OFallon IL now, everywhere before
Posts: 299
Default

Quote:
Originally Posted by greghughespdx View Post
Do not wrap the RV-12 exhaust. It's not manufactured not intended for that. And, it would have no impact related to the issue described in the SB, other than to make it basically impossible to examine the pipe itself.
Thank You!
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