Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_229917_2 ( tail_number VARCHAR, brief_description VARCHAR )

### Question ###
What's the tail number of the airplane involved in the accident described as crashed?

### Accurate SQL ###

SELECT tail_number FROM table_229917_2 WHERE brief_description = "Crashed"