An NTSB report that blames the FAA

From http://ntsb.gov/ntsb/brief.asp?ev_id...08X00571&key=1 :

The [NTSB] determines the probable cause(s) of this accident as follows:

...A second factor was the omission of the PW120A engine from the
airworthiness directive issued by the FAA which mandated the
completion of Pratt & Whitney service bulletin 20914. The lack
of inclusion of the PW120A engine in the AD resulted in the
company's correct interpretation that the service bulletin was
not mandatory.

You don't see that every day!

--
Ben Jackson AD7GD

http://www.ben.com/