Docket No. 2002-CE-46-AD.
This AD affects Model P-180 airplanes, all serial numbers, that are certificated in any category.
The actions specified by this AD are intended to prevent a faulty firewall shutoff or crossfeed valve from developing cracks and leaking fuel. This could result in an engine fire.
...If, by checking the maintenance records, the owner/operator can definitely show that no Electro Mech P/N EM484–3 firewall shutoff or crossfeed valves with a serial number in the range of 148 through 302 are installed, then the inspection requirement of paragraph (d)(2) and the replacement requirement of paragraph (d)(3) of this AD do not apply... If the pilot cannot definitely show that no affected firewall shutoff or crossfeed valves are installed through the maintenance records check, then the Inspection and Replacement requirements of paragraphs (d)(2) and (d)(3) of this AD must be accomplished by an appropriately-rated mechanic.
...If any Electro Mech P/N EM484–3 firewall shutoff or crossfeed valve is found that incorporates a serial number in the range of 148 through 302, accomplish one of the following:
(i) Install valve(s) that does not (do not) incorporate a serial number in the range of 148 through 302; or.
(ii) Modify any valve(s) that incorporates (incorporate) a serial number in the range of 148 through 302. The valve will be
re-identified with an "A" at the end of the serial number.
Accomplish any necessary replacements or modifications prior to further flight...
This amendment becomes effective on March 8, 2003.

FMI: http://ftp.atp.com/ADs/pdf/030314.pdf