@rottenjohn: apparently you were did not follow the link to the other discussion topic where a wide variety of such examples are listed. Go back and read again. And need we really mention how well the AStars seem to burn...

That sounds like a chugging problem they were having a while ago. They said changing the tranny mounts fixed the problem, however, they never seemed to figure out why it was chugging.

,...so gotta give you that one.

Lots of misinformation in this thread. The helicopter was not owned by Robinson, it was owned by Civic Helicopters with one of their CFIs onboard along with a student. The student missed the dolley, resulting in a dynamic rollover that the CFI was too slow to catch in time. This would have happened with literally any helicopter. In fact there was a fatal accident a few years ago at the same airport where someone in an AS350 tried to land on a dolley but messed up so badly he went upside-down.

nomorehelosforme: The practice of covering up registration markings, and any other identifying features, of a crashed helicopter is surprisingly common. I have done it once (on an AS350) and I'm not in any hurry to do it again. Though not a requirement this practice aims to protect the owner-operator against any wild media speculation regarding the accident by self appointed "experts" who always seem to crawl out of the woodwork when accidents happen. I'm sure most of you will agree that PPRune is a good example of this. .

Not quite upside down...it was on its side spinning, and speculation is the deaths occurred due to the high centrifugal forces of the spin.

Covering rego markings, and or company logos is considered best practice in the airline industry after a crash (am an ex-airline PR guy).
Stops the photo of your logo blackened and charred going worldwide - see Air NZ's Koru on the tail at the Erebus site for example.
There's an additional benefit of doing so.
When I were a journo - the quick and dirty way of finding the relatives of dead people to ask them how do you feel (utterly reprehensible I know - but demanded by editors) was to do a rego search to get the name of the owner.
If it was an individual - cross match that name with an electoral roll search and bingo - you have an address at which to door knock.
Vile business - never had the stomach for it.

Permit me elaborate a little regarding my Post #26; When I wrote, "....and I'm not in any hurry to do it again" I was thinking about the argument I had with a senior police officer at the scene who couldn't understand what I was doing with a can of paint and a brush. Against his "advice" I continued to paint over the registration marks, serial number, company logo and company name. It was only when he uttered the words "tampering with evidence" that I stopped - I was done anyway. The moral of the story - don't get carried away at an accident scene, cover the identifying markings then stop and wait for the real experts..