Airworthiness Directive · Amendment 39-15495 · Boeing Model 737-600, -700, -700C, -800 and -900 Series Airplanes
Boeing Model 737-600, -700, -700C, -800 and -900 Series Airplanes
This AD applies to Boeing Model 737-600, -700, -700C, -800 and -900 series airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 737-28-1257, Revision 1, dated November 28, 2007.
We are adopting a new airworthiness directive (AD) for certain Boeing Model 737-600, -700, -700C, -800 and -900 series airplanes. This AD requires inspecting ground blocks GD261 and GD264 for corrosion, measuring the electrical bond resistance between the ground blocks and the airplane structure, separating the ground wires for the fuel boost pump circuit between ground blocks GD261 and GD264, and doing corrective actions if necessary. This AD results from a report of random flashes of the six fuel pump low pressure lights and intermittent operation of the fuel boost pumps. We are issuing this AD to prevent the simultaneous malfunction of all six fuel boost pumps, which could cause the engines to operate on suction feed and potentially flame out.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 24 months after the effective date of this AD: Do a general visual inspection of ground blocks GD261 and GD264 for corrosion, measure the electrical bond resistance, and separate the ground wires for the fuel boost pump circuit between ground blocks GD261 and GD264. Do these actions in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 737-28-1257, Revision 1, dated November 28, 2007. Do applicable corrective actions before further flight in accordance with the service bulletin.
Actions accomplished before the effective date of this AD in accordance with Boeing Special Attention Service Bulletin 737-28-1257, dated February 26, 2007, are acceptable for compliance with the corresponding requirements of this AD.
