Usually the TSO labeling is not separate and is included in the main equipment ID label with the mfr info, model/part number, serial number, etc. Was the Narco label on the back of the unit missing? If I recall Narco used a black colored label on the back of the xspndr. Do you have any pictures from your ebay ad you can post?
So the factory label on the back case is missing? Then technically your buyer's installer has a valid point regardless of what was stamped on the front. But if it was me installing it I would be more concerned it worked as mentioned above than a decal on the back. Too bad Narco went out of business then you could have contacted them for assistance even without knowing the units serial number. But as an FYI there really is no "TSO label" rather there are only specific part marking requirements for the TSOA.
True. But just to go complete circle on this, the lack of a TSO marking does not technically make the unit unairworthy or call for its removal. There is FAA guidance on this. There is also guidance on how to re-mark a PMA or TSO part after manufacture. However, since the OP sold the unit it take this into another realm.
FYI: There's no FAA requirement to have the part re-certified for missing/restored markings. Nor does a missing tag or marking determine airworthiness to include your seatbelts. Now certain operational requirements found in Part 121 and some 135 ops might alter the previous statement but within GA ops and most 135 ops the above statement is valid. AC 43-213 is one of the guidance docs. FSIM 8900.1 also deals with this topic and a couple others I believe.
Well the OP never really clarified that point yet when asked. I believe Narco had one tag on the back side of the unit with all the required info to include the TSO markings. Unfortunately his only pic shows the front. Someone would have to go out of their way to remove that original label. Hence the questions about it.???
Perhaps I did not clarify the details. There was no manufacturer tag of any sort on the unit. As I said this was my fault for not recognizing the missing label or investigating the reason it was missing. I purchased the unit from a reputable avionics shop at my field in 2017 simply as a replacement to the AT-150 that was in my aircraft and no longer working. Because the avionics shop placed the yellow sticker on top of the unit it completely through me off of looking for the manufacturers tag - again of course I should have known better. Other than the certification that was performed at the time I purchased the unit, there is no historic entries in my log books regarding this specific unit. I have offered to refund the money and have already apologized to the buyer for the inconvenience. Selling the unit was not really about money - I wanted to help someone out that might have a bad unit as I know there are quite a few of these old xpdrs still out there. I really appreciate all of the comments and the different perspectives on this topic - much more feedback than I really expected.
The only reason they flew was because there aren't any schools for handicapped children of personal injury attorneys in the area. Fly over one of those with a missing tag and a crash is guaranteed.
FWIW: if you still have that yellow tag and if you can procure a copy of the xspndr installation entry (though you state there is none??) perhaps you can offer this to the buyer as a concession. Be sure to mention AC 43-213 chg 1, paragraph 5(d) and 6 as your reference. I would think someone trying to keep a AT-150 system working in their aircraft would go with this. Unless his installer prefers to put in a new system for him.
