Airworthiness Directive · Amendment 39-22616 · Fuel
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, 747SP, 747-8F, and 747-8 series airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 747 airplanes. This AD was prompted by reports of latent failures of the lightning protection features for the engine fuel feed system. This AD requires an inspection for damage and a measurement of the electrical bonding resistance of the out-tank fuel feed tube bonding jumper in the strut for each of the four engines, a measurement of the electrical bonding resistance of the forward side of the front spar bulkhead fitting adapter for each of the four engines, and applicable related investigative and corrective actions. The FAA is issuing this AD to address the unsafe condition on these products.
Within 90 days after the effective date of this AD for Model 747 airplanes operated in a passenger configuration, and within 120 days after the effective date of this AD for Model 747 airplanes operated in an all-cargo configuration: Do a detailed inspection for damage and measure the electrical bonding resistance of the out-tank fuel feed tube bonding jumper in the strut for each of the four engines, measure the electrical bonding resistance of the forward side of the front spar bulkhead fitting adapter for each of the four engines, and do all applicable related investigative and corrective actions, in accordance with Part 2 of the applicable Boeing multi operator message specified in paragraphs (g)(1) through (3) of this AD. Do all applicable related investigative and corrective actions before further flight. Repeat the inspection and measurements thereafter at intervals not to exceed 12 months.
(1) For Model 747-8 and 747-8F series airplanes: Boeing Multi Operator Message MOM-MOM-23-0885-01B-R1, dated November 13, 2023.
(2) For Model 747-400, 747-400D, and 747-400F series airplanes: Boeing Multi Operator Message MOM-MOM-23-0899-01B-R1, dated November 13, 2023.
(3) For Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SR, and 747SP series airplanes: Boeing Multi Operator Message MOM-MOM-23-0907-01B, dated November 13, 2023.
At the applicable compliance times specified in paragraphs (h)(1) and (2) of this AD: Submit a report of all findings from each work package performed as required by paragraph (g) of this AD, in accordance with Appendix C of the applicable Boeing multi operator message identified in paragraphs (g)(1) though (3) of this AD.
(1) For the initial inspections and measurements required by paragraph (g) of this AD, submit the report at the applicable compliance time specified in paragraph (h)(1)(i) or (ii) of this AD.
(i) For Model 747 airplanes operated in a passenger configuration: Within 120 days after the effective date of this AD.
(ii) For Model 747 airplanes operated in an all-cargo configuration: Within 150 days after the effective date of this AD.
(2) For each repetitive inspection and measurement required by paragraph (g) of this AD, submit the report at intervals not to exceed 30 days after completing all four work packages.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
