Airworthiness Directive · Amendment 39-18954 · Fuel system
The Boeing Company Airplanes
This AD applies to The Boeing Company Model MD-11 and MD-11F airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin MD11-28A148, Revision 1, dated March 24, 2017.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model MD-11 and MD-11F airplanes. This AD was prompted by report of fuel odor in the cabin. Fuel was found leaking from a cracked fuel line shroud in the left cargo compartment equipment tunnel. This AD requires a check for the presence of fuel at the fuel shroud drain; a high frequency eddy current (HFEC) inspection for cracked fuel line shrouds; a pressure test of the drain system of the tail tank fuel shroud and a pressure test of the drain system of the aft fuselage fuel shroud to determine cracking; and corrective actions, if necessary. We are issuing this AD to address the unsafe condition on these products.
Do the actions in paragraphs (g)(1) or (g)(2) of this AD, as applicable.
(1) Except as specified in paragraph (h) of this AD: At the applicable time in Table 1 of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin MD11-28A148, Revision 1, dated March 24, 2017, do the actions in paragraphs (g)(1)(i), (g)(1)(ii), and (g)(1)(iii) of this AD. Before further flight do all applicable corrective actions, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD11-28A148, Revision 1, dated March 24, 2017. Repeat the actions thereafter at the applicable time in Table 1 of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin MD11-28A148, Revision 1, dated March 24, 2017.
(i) Check for the presence of fuel at the fuel shroud drain valves.
(ii) Do a high frequency eddy current (HFEC) inspection for cracked fuel line shrouds.
(iii) Do a pressure test of the drain system of the tail tank fuel shroud and a pressure test of the drain system of the aft fuselage fuel shroud to determine if there is cracking.
(2) Except as specified in paragraph (h) of this AD: At the applicable time in Table 2 of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin MD11-28A148, Revision 1, dated March 24, 2017, do the actions in paragraphs (g)(2)(i) and (g)(2)(ii) of this AD. Before further flight do all applicable corrective actions, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin MD11-28A148, Revision 1, dated March 24, 2017. Repeat the actions thereafter at the applicable time in Table 2 of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin MD11-28A148, Revision 1, dated March 24, 2017.
(i) Check for the presence of fuel at the fuel shroud drain valves.
(ii) Do a pressure test of the drain system of the tail tank fuel shroud and a pressure test of the drain system of the aft fuselage fuel shroud to determine if there is cracking.
Where Boeing Alert Service Bulletin MD11-28A148, Revision 1, dated March 24, 2017, specifies a compliance time of “after the original issue date of this service bulletin,” this AD requires compliance within the specified compliance time after the effective date of this AD.
