AD 99-13-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 777-200 Series | Airworthiness Directives; BOEING Model 777 Series Airplanes |
| aircraft | The Boeing Company | 777-300 Series | Airworthiness Directives; BOEING Model 777 Series Airplanes |
Unsafe Condition
Fatigue cracking of the outboard support assembly of the flaperons on the wings due to excessive cyclic loads caused by high engine thrust during takeoff could result in fracture of the flaperon support structure, loss of the flaperon, and consequent reduced controllability of the airplane.
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Required Actions
Conduct repetitive high frequency eddy current inspections to detect cracking of the upper cutout and lower flange of the outboard support assembly. Perform corrective actions including modification of fairings, replacement of components, and operational tests. Accomplish modifications to eliminate the need for repetitive inspections as an optional terminating action.
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Compliance Time
Before further flight if any cracking is detected. Compliance with the terminating action must be accomplished within the specified flight cycle limits (4,000 for Rolls-Royce engines, 10,000 for GE/Pratt & Whitney engines).
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Affected Aircraft
Boeing Model 777-200 and 777-300 series airplanes powered by Rolls-Royce, General Electric, or Pratt & Whitney engines, as listed in Boeing Alert Service Bulletin 777-57A0008.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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