AD 2006-12-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-100B | Airworthiness Directives; Boeing Model 747-100B, 747-200B, 747-200F, 747-300, 747-400, 747-400F, and 747SP Series Airplanes |
Unsafe Condition
Midpivot bolt and midpivot bolt access door of the spring beam of the inboard side of the outboard struts were installed in the incorrect position, leading to potential overload, crack, or fracture of the midpivot bolt, which could result in the loss of the spring load path and consequent separation of the associated outboard strut and engine from the airplane.
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Required Actions
Inspect the midpivot bolt and midpivot bolt access door for discrepancies, including correct part number, damage, and correct position of anti-rotation tabs. Install a placard on the midpivot bolt access door. Perform applicable corrective actions if necessary, including replacing damaged or incorrectly installed midpivot bolt access doors and midpivot bolts.
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Compliance Time
Within 24 months from the release date of Boeing Service Bulletin 747-54A2225 or within 90 days from accumulating 8,000 flight cycles from the accomplishment of SB 747-54A2157, whichever occurs first.
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Affected Aircraft
Boeing Model 747-100B, 747-200B, 747-200F, 747-300, 747-400, 747-400F, and 747SP series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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