Airworthiness Directive · Amendment 39-21477 · Fuel
The Boeing Company Airplanes
This AD applies to all The Boeing Company airplanes, certificated in any category, identified in paragraphs (c)(1) and (2) of this AD.
(1) Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, 747SR, 747SP, -8F, and -8 series airplanes.
(2) Model 767-200, -300, -300F, -400ER, and -2C series airplanes.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 747 series airplanes and Model 767 series airplanes. This AD was prompted by a report of an un-commanded fuel transfer between the main and center fuel tanks. This AD prohibits operation of an airplane with any inoperative refuel valve (fueling shut-off valve) failed in the open position. The FAA is issuing this AD to address the unsafe condition on these products.
No later than 60 days after the effective date of this AD: Operation of an airplane with any inoperative refuel valve (fueling shut-off valve) of the reserve tank (on Model 747 series airplanes only), main tank, or center tank that has failed in the open position is prohibited.
The MMEL items specified in paragraphs (h)(1) through (5) of this AD are affected by this prohibition and therefore may affect the operator's FAA-approved MEL.
(1) For Model 747-100, -200, and -300 series airplanes: The following “Pressure Fueling System” items.
(i) MMEL Item 28-20 2), “Main Tank 1 and 4 Refueling Valves.”
(ii) MMEL Item 28-20 3), “Main Tank 2 and 3 Refueling Valves.”
(iii) MMEL Item 28-20 4), “Center Tank Refueling Valves.”
(iv) MMEL Item 28-20 5), “Reserve Tank 1 and 4 Refueling Valves.”
(v) MMEL Item 28-20 6), “Reserve Tank 2 and 3 Refueling Valves.”
(2) For Model 747-400LCF series airplanes: MMEL Item 28-21-1 1), “Refuel Valves,” second dispatch case with refueling valves inoperative open.
(3) For Model 747-400 series airplanes: MMEL Item 28-21-1 1), “Refuel Valves,” first dispatch case with refueling valves inoperative open.
(4) For Model 747-8 series airplanes: The following “Refuel Valves” items.
(i) MMEL Item 28-21-01-01-01A, “Refuel Valves.”
(ii) MMEL Item 28-21-01-02-01A, “Refuel Valves.”
(5) For Model 767 series airplanes (except Model 767-2C airplanes, for which there is no published MMEL): MMEL Item 28-21-01-01B, “Fuel Shutoff Valves.”
Note 1 to paragraph (h): The MMEL items specified in paragraph (h) of this AD can be found in the applicable FAA-approved MMEL: Boeing 747 B-747-100/200/300/SP SERIES MMEL, Revision 35, dated April 25, 2014; Boeing 747 B-747-400 LCF MMEL, Revision 3, November 7, 2014; Boeing 747 B-747-400, B-747-400D, B-747-400F MMEL, Revision 32, dated December 27, 2018; Boeing 747-8 MMEL, Revision 7, dated August 25, 2017; and Boeing 767 MMEL, Revision 39, dated October 26, 2018; which can be found on the Flight Standards Information Management System (FSIMS) website, https://fsims.faa.gov/PICResults.aspx?mode=Publication&doctype=MMELByModel.
