AD NUMBER: 2011-26-09

MANUFACTURER: Boeing Company Airplanes
SUBJECT: B737-600, -700, -700C, -800, -900, and -900ER series airplanes
ACTION: Final rule.

SUMMARY: We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This AD was prompted by reports of excessive in-service wear damage of the thumbnail fairing edge seal, and of the panel rub strip and skin assembly of the fan cowl. This AD requires replacement of the thumbnail fairing edge seals on both sides of the engines with Nitronic 60 stainless steel alloy seals. We are issuing this AD to prevent failure of the fire seal, which could allow a fire in the fan compartment to spread beyond the firewall and reach the flammable fluid leakage zones, resulting in an uncontrolled fire.
DATES: This

DATES: This AD is effective February 3, 2012. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in the AD as of February 3, 2012.

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/Frameset?OpenPage