SB are mandatory for commercial operators, but an AD may
make compliance dates sooner.

The FAA handles paper by the ton, corrections are common.


"Ben Jackson" wrote in message
...
| 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/