AD 2011-26-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Excessive in-service wear damage of the thumbnail fairing edge seal and the panel rub strip and skin assembly of the fan cowl could lead to failure of the fire seal, allowing a fire in the fan compartment to spread beyond the firewall and reach flammable fluid leakage zones, resulting in an uncontrolled fire.
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Required Actions
Replace the thumbnail fairing edge seals on both sides of engine 1 and engine 2 with new Nitronic 60 stainless steel alloy seals, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 737-54-1046, dated February 16, 2011.
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Compliance Time
Within 60 months after the effective date of this AD.
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Affected Aircraft
The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 737-54-1046, dated February 16, 2011.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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