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  #1  
Old 11-03-2020, 07:09 AM
pierre smith's Avatar
pierre smith pierre smith is offline
 
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,896
Default Beware DARs

Guys, I had a DAR do a prebuy for an interested party and he found rust in my cylinders. Unfortunately, he didn’t say, “thin coating, or insignificant” rust, and it cost me a sale!

It sounds. Like a game changer if it isn’t specified as, “slight” or similar, instead it could sound like a really thick layer, or a massive thickness, if it’s not specified to the buyer. My compressions are all above 75/80 on all cylinders which would not be possible with thick rust deposits, so be careful of who you use.

Regards,
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  #2  
Old 11-03-2020, 07:32 AM
pa38112 pa38112 is offline
 
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Location: Clarksboro, NJ
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How long ago was it flown? I would not think rust would show after a flight. I have seen borascope immages of light reflections that look like all kinds of horrer until you get the angle right.
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Last edited by pa38112 : 11-03-2020 at 07:34 AM.
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  #3  
Old 11-03-2020, 07:40 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,984
Default

If it is just light surface corrossion, I suggest that you run the engine before each inspection. This can develop in just a few weeks. A lot of this is light stuff that gets scrapped off when the engine is run.

Larry
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  #4  
Old 11-03-2020, 07:55 AM
664781 664781 is offline
 
Join Date: Jan 2005
Location: Powder Springs, Ga
Posts: 321
Default Per Buy

I completely agree..... Both Lycoming and Continental have addressed this issue and do not give in service limits to cylinder wall wear/corrosion. Their stance is if the compression check is good the cylinder is serviceable.

I would recommend that the next inspection starts off with an engine run prior to any inspections and only borescope for valve issues.
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  #5  
Old 11-03-2020, 09:41 AM
WingsOnWheels WingsOnWheels is offline
 
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,137
Default

Quote:
Originally Posted by pierre smith View Post
Guys, I had a DAR do a prebuy for an interested party and he found rust in my cylinders. Unfortunately, he didn’t say, “thin coating, or insignificant” rust, and it cost me a sale!

It sounds. Like a game changer if it isn’t specified as, “slight” or similar, instead it could sound like a really thick layer, or a massive thickness, if it’s not specified to the buyer. My compressions are all above 75/80 on all cylinders which would not be possible with thick rust deposits, so be careful of who you use.

Regards,
If I could afford a 10 right now I would come down and buy yours...rusty cylinders and all...
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  #6  
Old 11-03-2020, 12:06 PM
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Vern Vern is offline
 
Join Date: Jan 2005
Location: Peachtree City, Ga
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Default Pre buy

Although I am a DAR, I did not do this inspection.

Pierre, who paid for the inspection, you or the looker?

Most pilots would ask the inspector if it was minor rust or an engine killer. If the looker did not pursue that he may not be familiar with aircraft engines

If the looker paid for the inspection and the rust was not mentioned there would be an integrity issue.

If you paid for the inspection, don’t you want to know about it?
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  #7  
Old 11-03-2020, 12:15 PM
calpilot calpilot is offline
 
Join Date: Aug 2018
Location: Independence
Posts: 107
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I am a DAR, and I do a lot of pre purchase inspections. I take photos of anything that may be suspect, such as glaze in the cylinders, pitting on valve seats, etc. I give the client a detailed description of what I find, and only offer an opinion if the client wants to know how serious it is, or how much it would cost to repair, etc. Nitrided cylinders will show rust quick quickly, steel takes a bit longer, and chrome or nickel longer yet. I like to work the problem backwards. I ask the client what he thinks the aircraft is worth if all checks out, and then suggest he subtract what needs attention. Usually try to sort out for him or her what is expensive, and what is not.

Regards,

Gary
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  #8  
Old 11-03-2020, 03:09 PM
sailvi767 sailvi767 is offline
 
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Location: Charlotte NC
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Pierre, is the aircraft back on the market?
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  #9  
Old 11-03-2020, 04:00 PM
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pierre smith pierre smith is offline
 
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Location: Louisville, Ga
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Quote:
Originally Posted by sailvi767 View Post
Pierre, is the aircraft back on the market?
Hi guy....long time no see! Yes, it’s on the market. My phone 478 494 3757.

Regards,
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  #10  
Old 11-03-2020, 04:03 PM
pierre smith's Avatar
pierre smith pierre smith is offline
 
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,896
Default

Quote:
Originally Posted by calpilot View Post
I am a DAR, and I do a lot of pre purchase inspections. I take photos of anything that may be suspect, such as glaze in the cylinders, pitting on valve seats, etc. I give the client a detailed description of what I find, and only offer an opinion if the client wants to know how serious it is, or how much it would cost to repair, etc. Nitrided cylinders will show rust quick quickly, steel takes a bit longer, and chrome or nickel longer yet. I like to work the problem backwards. I ask the client what he thinks the aircraft is worth if all checks out, and then suggest he subtract what needs attention. Usually try to sort out for him or her what is expensive, and what is not.

Regards,

Gary
Hi Gary,....now that sounds
very fair, to both buyer and seller. Thanks for the input.
Regards,
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