AD 2008-23-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-100 | Airworthiness Directives; Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, and 747SR Series Airplanes |
Unsafe Condition
Loss of the transmission attachment design could result in the potential loss of an outboard trailing edge flap, leading to discrepancies such as a flap skew or lateral control asymmetry. These issues can cause collateral damage to adjacent hydraulic tubing and subsequent loss of a hydraulic system, potentially exceeding asymmetric flight control limits and adversely affecting the airplane's continued safe flight and landing.
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Required Actions
Modify the outboard flap track and transmission attachments by replacing the bolts with non-Inconel, dual load path bolts; installing new flap tracks; and installing the new transmission attachment fitting. These actions must be performed in accordance with the specified service bulletins.
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Compliance Time
Within 3 years and 6 years, as specified in the AD.
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Affected Aircraft
Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, and 747SR Series Airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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