Airworthiness Directive · Amendment 39-15690 · Boeing Model 747-400, 747-400D, and 747-400F Series Airplanes
Boeing Model 747-400, 747-400D, and 747-400F Series Airplanes
This AD applies to Boeing Model 747-400, 747-400D, and 747-400F series airplanes, certificated in any category; as identified in Boeing Special Attention Service Bulletin 747-28-2260, dated March 13, 2008.
We are adopting a new airworthiness directive (AD) for certain Boeing Model 747-400, 747-400D, and 747-400F series airplanes. This AD requires installing an extension tube to the existing pump discharge port of the scavenge pump on the outboard side of the center fuel tank in the main fuel tank <greek-i>2. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent a fire or explosion in the fuel tank and consequent loss of the airplane.
Comply with this AD within the compliance times specified, unless already done.
Within 60 months after the effective date of this AD, install an extension tube to the existing pump discharge port of the scavenge pump on the outboard side of the center fuel tank in the main fuel tank #2, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-28-2260, dated March 13, 2008.
