The loss pattern observed by the BLM monitors around the LHC ring is, in most cases, well understood. Nevertheless, there are special cases of losses which occurred in 2010 run and which need to be further studied in order to understand their mechanism and the BLM signals which they generate.
The important beam losses, generating large signals in the BLMs, have been usually noticed during the operation because they were very visible on fixed displays, they affected the beam lifetime or even initiated the beam dump. Examples of such losses are discussed first. A systematic search of nominal loss level variation has also been performed in order to look for loss variations, which have been unnoticed during operation.