AD 2011-09-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company Model 747-200B | Airworthiness Directives; The Boeing Company Model 747-200B, -300, -400, -400D, and -400F Series Airplanes Powered by Pratt and Whitney 4000 or General Electric CF6-80C2 Series Engines |
| engine | General Electric | CF6-80C2 Series | Airworthiness Directives; The Boeing Company Model 747-200B, -300, -400, -400D, and -400F Series Airplanes Powered by Pratt and Whitney 4000 or General Electric CF6-80C2 Series Engines |
Unsafe Condition
Incorrect installation of the left and right access doors of the spring beam mid-pivot bolt assembly for the No. 1 strut could lead to fatigue cracking and consequent fracturing of the mid-pivot bolt assembly, which could lead to loss of the spring beam load path and the possible separation of a strut and engine from the airplane during flight.
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Required Actions
Inspect to determine the part number of the mid-pivot access door and verify if the correct door is installed. Install a marker on the mid-pivot access door. If necessary, perform repetitive ultrasonic inspections for cracking of the mid-pivot bolt assembly and replace the mid-pivot bolt assembly if cracking is detected.
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Compliance Time
Within 24 months after the effective date of this AD
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Affected Aircraft
The Boeing Company Model 747-200B, -300, -400, -400D, and -400F series airplanes powered by Pratt and Whitney 4000 or General Electric CF6-80C2 series engines, as identified in Boeing Alert Service Bulletin 747-54A2232, dated April 15, 2010.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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